Peng Wang

The design of a photosensitizer characteristic of both excellent absorption of infrared solar photons and high external quantum efficiencies (EQEs) should be a momentous stride towards the further performance improvement of dye-sensitized solar cells. In this paper, by using a binary twisting electron-donor triphenylamine-phenanthrocarbazole (TPA-PC) we first demonstrate that the transformation of the electron-acceptor from twisting 4-(benzo[c][1,2,5]thiadiazol-4-yl)benzoic acid (BTBA) to planar 4-((7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)ethynyl)benzoic acid (EBTEBA) can significantly stabilize the lowest unoccupied molecular orbital (LUMO) energy level of an organic dye but does not lower EQEs. Also we show that the application of the electron-donor 11-(2-hexyldecyl)-8-(4-((2-hexyldecyl)oxy)phenyl)-6,6-bis(4-hexylphenyl)-6,11-dihydrothieno[3′,2′:8,9]chryseno[10,11,12,1-bcdefg]carbazole (P-TCC) with a planar electronic skeleton, featuring a comparable electron-releasing strength to the twisting counterpart TPA-PC, can enhance the absorption of infrared solar photons, without reducing the energy gap between the highest occupied molecular orbital (HOMO) and LUMO. Dye C288 with P-TCC as the electron-donor and EBTEBA as the electron-acceptor retains an almost planar electronic skeleton and a high power conversion efficiency of 12%. Stationary and femtosecond dynamic photoluminescence (PL) measurements have suggested cascade excited state relaxations and multiple-state electron injections at the titania/dye interface, in collaboration with theoretical calculations on the excited state conformations.

Unlocking the effects of ancillary electron-donors on light absorption and charge recombination in phenanthrocarbazole dye-sensitized solar cells

Co-reporter:Heng Wu, Lin Yang, Yang Li, Min Zhang, Jing Zhang, Yanchun Guo and Peng Wang

Journal of Materials Chemistry A 2016 vol. 4(Issue 2) pp:519-528

Publication Date(Web):25 Nov 2015

DOI:10.1039/C5TA09136E

Consecutive explorations on polycyclic aromatic hydrocarbons (PAHs) as the central blocks of organic photosensitizers have very recently brought forth a new opportunity towards efficiency enhancement of dye-sensitized solar cells (DSCs). In this paper, to scrutinize the effects of ancillary electron-donors on light absorption and charge recombination in phenanthrocarbazole (PC) dye-sensitized solar cells, we synthesized three dyes with the respective pristine PC, fluorenyl functionalized PC, and carbazyl functionalized PC electron-donors in conjunction with the 4-(7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)benzoic acid electron-acceptor. With respect to the reference dye only using PC as the electron-donor, attaching an ancillary electron-donor, 2-hexyldecyl tethering fluorenyl or carbazyl, to the free end of PC can result in a destabilized highest occupied molecular orbital energy level and a red-shifted absorption peak as well as an enhanced maximum molar absorption coefficient. The end-capping of PC with fluorenyl or carbazyl can also slow down the kinetics of charge recombination of titania electrons with both cobalt(III) ions and photooxidized dye molecules, giving rise to an increased photovoltage and an improved power conversion efficiency. Moreover, time-resolved photophysical measurements disclose that these styles of reducing energy-gaps do not exert influence on the yields of electron and hole injections.

A Systematic Study on the Influence of Electron-Acceptors in Phenanthrocarbazole Dye-Sensitized Solar Cells

Co-reporter:Lin Yang, Zhaoyang Yao, Jiao Liu, Junting Wang, and Peng Wang

ACS Applied Materials & Interfaces 2016 Volume 8(Issue 15) pp:9839

Publication Date(Web):March 30, 2016

DOI:10.1021/acsami.6b02075

In this work, by conjugating 2-cyanoacrylic acid (CA), 4-(benzo[c][1,2,5]thiadiazol-7-yl)benzoic acid (BTBA), 4-(7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)benzoic acid (EBTBA), and 4-((7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)ethynyl)benzoic acid (EBTEBA) to a binary electron-donor diphenylamine-phenanthrocarbazole (DPA-PC), we systematically investigate the impacts of electron-acceptors upon energy level, energy gap, light-harvesting ability, photovoltaic parameter, and cell stability of donor–acceptor dyes in photoelectrochemical cells. In conjunction with an ionic liquid composite electrolyte, the DPA-PC dye with EBTEBA as electron-acceptor yields a high power conversion efficiency of 8% and an outstanding stability after a 1000 h aging test under the soaking of full sunlight at 60 °C in a dye-sensitized solar cell. Femtosecond fluorescence up-conversion measurements have suggested that energy relaxation and electron injection both occur to dye molecules in the nonequilibrium excited states. Moreover, the time constants of injecting electrons from dye molecules in the excited states to titania are very dispersive for over 1 order of magnitude, mainly owing to the broad energy distribution of excited states.Keywords: charge transfer; excited state; perylene; solar cell; ultrafast spectroscopy;

Ultralong Rutile TiO2 Nanowire Arrays for Highly Efficient Dye-Sensitized Solar Cells

Co-reporter:Hailiang Li, Qingjiang Yu, Yuewu Huang, Cuiling Yu, Renzhi Li, Jinzhong Wang, Fengyun Guo, Shujie Jiao, Shiyong Gao, Yong Zhang, Xitian Zhang, Peng Wang, and Liancheng Zhao

ACS Applied Materials & Interfaces 2016 Volume 8(Issue 21) pp:13384-13391

Publication Date(Web):April 21, 2016

DOI:10.1021/acsami.6b01508

Vertically aligned rutile TiO2 nanowire arrays (NWAs) with lengths of ∼44 μm have been successfully synthesized on transparent, conductive fluorine-doped tin oxide (FTO) glass by a facile one-step solvothermal method. The length and wire-to-wire distance of NWAs can be controlled by adjusting the ethanol content in the reaction solution. By employing optimized rutile TiO2 NWAs for dye-sensitized solar cells (DSCs), a remarkable power conversion efficiency (PCE) of 8.9% is achieved. Moreover, in combination with a light-scattering layer, the performance of a rutile TiO2 NWAs based DSC can be further enhanced, reaching an impressive PCE of 9.6%, which is the highest efficiency for rutile TiO2 NWA based DSCs so far.

Dithienopicenocarbazole as the kernel module of low-energy-gap organic dyes for efficient conversion of sunlight to electricity

Co-reporter:Zhaoyang Yao, Heng Wu, Yang Li, Junting Wang, Jing Zhang, Min Zhang, Yanchun Guo and Peng Wang

Energy & Environmental Science 2015 vol. 8(Issue 11) pp:3192-3197

Publication Date(Web):24 Sep 2015

DOI:10.1039/C5EE02822A

An electron-donor with a polycyclic aromatic hydrocarbon dithieno[2′,3′:2,3;3′′,2′′:10,11]piceno[1,14,13,12-bcdefgh]carbazole (DTPC) as the primary skeleton and also decorated with multiple solubilizing groups is coupled to 4-(benzo[c][1,2,5]thiadiazol-4-ylethynyl)benzoic acid, for a metal-free organic dye (C281). The near-infrared photosensitizing dye exhibits over 80% external quantum efficiency in a broad spectral range from 480 nm to 735 nm, and a high power conversion efficiency of 13.0% under irradiance of simulated AM 1.5G sunlight (100 mW cm−2).

A structurally simple perylene dye with ethynylbenzothiadiazole-benzoic acid as the electron acceptor achieves an over 10% power conversion efficiency

Co-reporter:Zhaoyang Yao, Heng Wu, Yameng Ren, Yanchun Guo and Peng Wang

Energy & Environmental Science 2015 vol. 8(Issue 5) pp:1438-1442

Publication Date(Web):20 Jan 2015

DOI:10.1039/C4EE03934C

On the basis of the N-annulated perylene electron donor and the ethynylbenzothiadiazole-benzoic acid electron acceptor, we herein report on synthesizing a structurally simple donor–acceptor (D–A) perylene dye C272. Without the use of any coadsorbate, we have achieved an impressive power conversion efficiency of 10.4% at air mass global (AM1.5G) conditions, which is comparable to that of the well-known zinc porphyrin dye YD2-o-C8.

Donor/Acceptor Indenoperylene Dye for Highly Efficient Organic Dye-Sensitized Solar Cells

Co-reporter:Zhaoyang Yao; Min Zhang; Heng Wu; Lin Yang; Renzhi Li

Journal of the American Chemical Society 2015 Volume 137(Issue 11) pp:3799-3802

Publication Date(Web):March 5, 2015

DOI:10.1021/jacs.5b01537

An N-annulated indenoperylene electron-donor decorated with photochemically inactive segments is synthesized and further conjugated via triple bond with electron-acceptor benzothiadiazolylbenzoic acid for a metal-free donor/acceptor dye. Without use of any coadsorbate, the judiciously tailored indenoperylene dye achieves a high-power conversion efficiency of 12.5% under irradiance of 100 mW cm–2 AM1.5G sunlight.

Efficient Triarylamine–Perylene Dye-Sensitized Solar Cells: Influence of Triple-Bond Insertion on Charge Recombination

Co-reporter:Cancan Yan, Wentao Ma, Yameng Ren, Min Zhang, and Peng Wang

ACS Applied Materials & Interfaces 2015 Volume 7(Issue 1) pp:801

Publication Date(Web):December 10, 2014

DOI:10.1021/am507261j

We synthesize two new metal-free donor–acceptor organic dyes (C266 and C267) featuring a N-annulated perylene block. Owing to the improved coplanarity of conjugated units as well as the prolonged conjugation upon inserting a triple bond between the triarylamine and perylene segments, the C267 dye exhibits a slightly red-shifted absorption peak and an enhanced maximum molar absorption coefficient with respect to its reference dye C266, leading to an improved photocurrent output in dye-sensitized solar cells. However, the triple-bond introduction also brings forth an over 100 mV reduced open-circuit photovoltage owing to faster interfacial charge recombination, which presents a clear correlation with a reduced mean thickness of self-assembled dye layer on titania as revealed by X-ray reflectivity measurements. The C266 dye, albeit with a relatively weaker light-harvesting capacity, displays a higher power conversion efficiency of 9.0% under the 100 mW cm–2, simulated AM1.5G sunlight.Keywords: charge recombination; organic dye; perylene; solar cell

A Metal-Free N-Annulated Thienocyclopentaperylene Dye: Power Conversion Efficiency of 12% for Dye-Sensitized Solar Cells

Co-reporter:Zhaoyang Yao;Dr. Min Zhang;Dr. Renzhi Li;Lin Yang;Yongna Qiao; Peng Wang

Angewandte Chemie International Edition 2015 Volume 54( Issue 20) pp:5994-5998

Publication Date(Web):

DOI:10.1002/anie.201501195

Abstract

Reported are two highly efficient metal-free perylene dyes featuring N-annulated thienobenzoperylene (NTBP) and N-annulated thienocyclopentaperylene (NTCP), which are coplanar polycyclic aromatic hydrocarbons. Without the use of any coadsorbate, the metal-free organic dye derived from the NTCP segment was used for a dye-sensitized solar cell which attained a power conversion efficiency of 12 % under an irradiance of 100 mW cm⁻², simulated air mass global (AM1.5G) sunlight.

A Metal-Free N-Annulated Thienocyclopentaperylene Dye: Power Conversion Efficiency of 12% for Dye-Sensitized Solar Cells

Co-reporter:Zhaoyang Yao;Dr. Min Zhang;Dr. Renzhi Li;Lin Yang;Yongna Qiao; Peng Wang

Angewandte Chemie 2015 Volume 127( Issue 20) pp:6092-6096

Publication Date(Web):

DOI:10.1002/ange.201501195

Abstract

Inside Cover: Electron-Acceptor-Dependent Light Absorption, Excited-State Relaxation, and Charge Generation in Triphenylamine Dye-Sensitized Solar Cells (ChemSusChem 1/2015)

Co-reporter:Dr. Renzhi Li;Dr. Min Zhang;Cancan Yan;Zhaoyang Yao;Jing Zhang; Peng Wang

ChemSusChem 2015 Volume 8( Issue 1) pp:

Publication Date(Web):

DOI:10.1002/cssc.201400088

Electron-Acceptor-Dependent Light Absorption, Excited-State Relaxation, and Charge Generation in Triphenylamine Dye-Sensitized Solar Cells

Co-reporter:Dr. Renzhi Li;Dr. Min Zhang;Cancan Yan;Zhaoyang Yao;Jing Zhang; Peng Wang

ChemSusChem 2015 Volume 8( Issue 1) pp:97-104

Publication Date(Web):

DOI:10.1002/cssc.201402806

Abstract

By choosing a simple triphenylamine electron donor, we herein compare the influence of electron acceptors benzothiadiazole benzoic acid (BTBA) and cyanoacrylic acid (CA), on energy levels, light absorption, and dynamics of excited-state evolution and electron injection. DFT and time-dependent DFT calculations disclosed remarkable intramolecular conformational changes for the excited states of these two donor–acceptor dyes. Photoinduced dihedral angle variation occurs to the triphenylamine unit in the CA dye and backbone planarization happens to conjugated aromatic blocks in the BTBA dye. Femtosecond spectroscopic measurements suggested the crucial role of having a long excited-state lifetime in maintaining a high electron-injection yield because a reduced driving force for a low energy-gap dye can result in slower electron-injection dynamics.

Electron-Acceptor-Dependent Light Absorption and Charge-Transfer Dynamics in N-Annulated Perylene Dye-Sensitized Solar Cells

Co-reporter:Lin Yang

The Journal of Physical Chemistry C 2015 Volume 119(Issue 2) pp:980-988

Publication Date(Web):December 19, 2014

DOI:10.1021/jp511687e

In this article, we report two metal-free perylene dyes (C269 and C270) featuring the electron acceptors benzothiadiazole–benzoic acid and ethynylbenzothiadiazole–benzoic acid, respectively, in combination with a bis(4-(hexyl)phenyl)amino-capped N-annulated perylene (NP) electron donor. Density functional theory (DFT) and time-dependent DFT (TDDFT) calculations revealed that the use of ethynylbenzothiadiazole–benzoic acid can lower the level of the lowest unoccupied molecular orbital (LUMO), reduce the energy gap, and attenuate the Stokes shift of an NP dye. These effects are in good accord with electrochemical and photophysical measurements. When used in sensitized titania solar cells, C270 dye exhibits a reasonably good power conversion efficiency close to 9% at an irradiance of 100 mW cm–2 simulated AM1.5 sunlight. It was also found that, with respect to C269, C270 dye forms a thinner and looser self-assembled dye layer on the surface of titania, accounting for the shorter electron lifetime and lower open-circuit photovoltage for cells made with C270. Our femtosecond transient absorption (fs-TA) measurements confirmed a positive relationship between the driving energy and electron-injection rate despite the close-to-unity electron-injection yields for both dyes. In addition, the target analysis of fs-TA data indicated that, with respect to C269, more electrons are injected from the relaxed excited states for C270 dye with a lower LUMO level.

N-Annulated Perylene as a Coplanar -Linker Alternative to Benzene as a Low Energy-Gap, Metal-Free Dye in Sensitized Solar Cells

Co-reporter:Zhaoyang Yao;Cancan Yan;Min Zhang;Renzhi Li;Yanchun Cai

Advanced Energy Materials 2014 Volume 4( Issue 12) pp:

Publication Date(Web):

DOI:10.1002/aenm.201400244

Perylenes are well-known pigments with excellent chemical, thermal, and photochemical stabilities and have been used in various optical and electronic fields. Although for sensitized mesoscopic solar cells there is rapid progress of metal-free thiophene dyes, which now reach over 11.5% power conversion efficiency (PCE) at air mass 1.5 global (AM1.5G) conditions, the so far reported highest PCE of a perylene dye is only 6.8%. Here, a new metal-free organic donor-acceptor (D-A) dye (C261) featuring a bisarylamino functionalized N-annulated perylene electron-releasing segment and a cyanoacrylic acid electron-withdrawing unit is synthesized. Combining a mesoporous titania film grafted by this structurally simple perylene dye with a non-corrosive cobalt redox shuttle, an 8.8% PCE is achieved at an irradiance of the AM1.5G sunlight. By selecting the model dye G221 as a reference, theoretical calculations, steady-state and time-resolved spectroscopies, and electrical measurements are used to compare the energy-levels, light absorptions, and mutichannel charge transfer dynamics that contribute to the photovoltaic behavior.

Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells

Co-reporter:Min Zhang, Lin Yang, Cancan Yan, Wentao Ma and Peng Wang

Physical Chemistry Chemical Physics 2014 vol. 16(Issue 38) pp:20578-20585

Publication Date(Web):01 Aug 2014

DOI:10.1039/C4CP03230F

A comprehensive description of the complicated dynamics of excited state evolution and charge transfer at the photochemical interface in dye-sensitized solar cells is crucial to understand the mechanism of converting solar photons to clean electricity, providing an informative basis for the future development of advanced organic materials. By selecting two triarylamine-based organic donor–acceptor dyes characteristic of the respective benzoic acid and cyanoacrylic acid anchors, in this paper we reveal stepwise excited state relaxations and multiple-state electron injections at a realistic titania/dye/electrolyte interface based upon ultrafast spectroscopic measurements and theoretical simulations. Density functional theory (DFT) and time-dependent DFT calculations show that the optically generated “hot” excited state of the dye molecules can undergo a significant conformational relaxation via multistage torsional motions, and thereby transform into an equilibrium quinonoid structure characteristic of a more planar conjugated backbone. A set of kinetic parameters derived from the target analysis of femtosecond transient absorption spectra have been utilized to estimate the electron injection yield, which is in good accord with the maximum of external quantum efficiencies.

Altering the Self-organization of Dyes on Titania with Dyeing Solvents to Tune the Charge-transfer Dynamics of Sensitized Solar Cells

Co-reporter:Dr. Yinglin Wang;Lin Yang;Jing Zhang;Dr. Renzhi Li;Dr. Min Zhang; Peng Wang

ChemPhysChem 2014 Volume 15( Issue 6) pp:1037-1042

Publication Date(Web):

DOI:10.1002/cphc.201301006

Abstract

Herein we selected the model organic donor–acceptor dye C218 and modulated the self-organization of dye molecules on the surface of titania by changing the dyeing solvent from chlorobenzene to a mixture of acetonitrile and tert-butanol. We further unveiled the relationship between the microstructure of a dye layer and the multichannel charge-transfer dynamics that underlie the photovoltaic performance of dye-sensitized solar cells.

Cover Picture: Altering the Self-organization of Dyes on Titania with Dyeing Solvents to Tune the Charge-transfer Dynamics of Sensitized Solar Cells (ChemPhysChem 6/2014)

Co-reporter:Dr. Yinglin Wang;Lin Yang;Jing Zhang;Dr. Renzhi Li;Dr. Min Zhang; Peng Wang

ChemPhysChem 2014 Volume 15( Issue 6) pp:

Publication Date(Web):

DOI:10.1002/cphc.201490026

Unraveling the Pivotal Impacts of Electron-Acceptors on Light Absorption and Carrier Photogeneration in Perylene Dye Sensitized Solar Cells

Co-reporter:Min Zhang, Zhaoyang Yao, Cancan Yan, Yanchun Cai, Yameng Ren, Jing Zhang, and Peng Wang

ACS Photonics 2014 Volume 1(Issue 8) pp:710

Publication Date(Web):July 15, 2014

DOI:10.1021/ph5001346

Understanding the ultrafast dynamics of excited state evolution and carrier generation at the complicated titania/dye/electrolyte interface is crucial for the development of narrow energy-gap organic dyes to enhance the performance of dye-sensitized solar cells (DSCs). We herein modulate the energy-levels of N-annulated perylene dyes in significant measure by use of benzothiadiazole-benzoic acid (BTBA) and pyridothiadiazole-benzoic acid (PTBA) segments as the electron-acceptors. Based on the model of cold vs hot excited states for electron injection in DSCs, we have perceived from femtosecond transient absorption measurements that a driving force diminution does not necessarily cause a deceleration of electron injection from the hot excited state to titania, suggesting a crucial role of electron coupling on interfacial charge transfer kinetics. Moreover, the electron-accetpor variation from BTBA to PTBA brings forth a fast relaxation of the hot excited state as well as a rapid deactivation of the cold excited state and a sluggish electron injection from the cold excited state to titania. These adverse multichannel kinetics jointly result in a remarkable diminishment of overall electron injection yield and, thus, lower external quantum efficiency of cell with the PTBA dye. Our studies have highlighted the importance of considering the excited state topology on the future design of low energy-gap photovoltaic materials.Keywords: charge transfer; excited state; light absorption; organic dye; solar cell

Correlating Multichannel Charge Transfer Dynamics with Tilt Angles of Organic Donor–Acceptor Dyes Anchored on Titania

Co-reporter:Yinglin Wang ; Lin Yang ; Mingfei Xu ; Min Zhang ; Yanchun Cai ; Renzhi Li

The Journal of Physical Chemistry C 2014 Volume 118(Issue 30) pp:16441-16446

Publication Date(Web):January 29, 2014

DOI:10.1021/jp410929g

Attaching the side chains onto the electronic backbone of photosensitizing dye molecules has been a widely employed method to enhance the performance of dye-sensitized solar cells (DSCs). However, at the present time the interfacial microstructure as well as its influence on the charge transfer dynamics have not been fully comprehended, both of which underpin the phenomenological photovoltaic characteristics. In this work, we derived the tilt angles of two organic donor–acceptor dyes anchored on the surface of titania by X-ray reflectivity measurements and probed the broad time scale dynamics of charge transfer reactions in DSCs, unveiling the intrinsic roles of bulky or branched side chains attached to the conjugated segment in modulating photovoltaic behaviors.

Rigidifying the π-Linker to Enhance Light Absorption of Organic Dye-Sensitized Solar Cells and Influences on Charge Transfer Dynamics

Co-reporter:Zhaoyang Yao ; Lin Yang ; Yanchun Cai ; Cancan Yan ; Min Zhang ; Ning Cai ; Xiandui Dong

The Journal of Physical Chemistry C 2014 Volume 118(Issue 6) pp:2977-2986

Publication Date(Web):January 24, 2014

DOI:10.1021/jp412070p

The usage of coplanar π-conjugated segments represents a feasible strategy on reducing the energy gap of organic push–pull dyes for mesoscopic titania solar cells. In this paper, we report two new dyes coded as C254 and C255 with the respective 1,4-di(thiophen-2-yl)benzene and indacenodithiophene π-linkers, in combination with the electron-releasing triphenylamine and electron-withdrawing cyanoacrylic acid units. The energy-gap reduction stemming from the rigidity of the π-linker is accompanied by a negative shift of the ground-state redox potential, which however does not affect the yield of hole injection from the oxidized state of dye molecules to a cobalt redox electrolyte. On the other side, we have identified from femtosecond transient absorption measurements a diminished rate of electron injection from the relaxed, low-energy excited state of C255 to titania, albeit a comparable rate of electron injection from the high-energy excited states of these two dyes. The bulkier C255 dye with four hexyl side chains tethered on the two sp3 carbons of the fused indacenodithiophene unit can form a more compact self-assembling monolayer on titania, considerably attenuating the charge recombination of photoinjected electrons in titania with the cobalt electrolyte and thus enhancing the cell photovoltage and efficiency.

Judicious selection of a pinhole defect filler to generally enhance the performance of organic dye-sensitized solar cells

Co-reporter:Min Zhang, Jing Zhang, Ye Fan, Lin Yang, Yinglin Wang, Renzhi Li and Peng Wang

Energy & Environmental Science 2013 vol. 6(Issue 10) pp:2939-2943

Publication Date(Web):06 Aug 2013

DOI:10.1039/C3EE42431F

An effective strategy of filling the pinhole defects of organic dye-grafted titania films via judicious selection of a filler as well as its bath solvent has been proposed to generally attenuate the interfacial charge recombination kinetics, bringing forth improved photovoltage, photocurrent and efficiency of organic dye-sensitized solar cells employing non-corrosive cobalt redox electrolytes.

Design of high-efficiency organic dyes for titania solar cells based on the chromophoric core of cyclopentadithiophene-benzothiadiazole

Co-reporter:Min Zhang, Yinglin Wang, Mingfei Xu, Wentao Ma, Renzhi Li and Peng Wang

Energy & Environmental Science 2013 vol. 6(Issue 10) pp:2944-2949

Publication Date(Web):09 Aug 2013

DOI:10.1039/C3EE42331J

Based upon the chromophoric core of cyclopentadithiophene-benzothiadiazole, we have finely tailored a metal-free organic dye which displays power conversion efficiencies at various irradiances of the simulated air mass (AM) 1.5 sunlight of 11.5–12.8%, setting a new benchmark for organic dye-sensitized solar cells.

Multiple-state interfacial electron injection competes with excited state relaxation and de-excitation to determine external quantum efficiencies of organic dye-sensitized solar cells

Co-reporter:Min Zhang, Lin Yang, Cancan Yan, Wentao Ma and Peng Wang

Physical Chemistry Chemical Physics 2014 - vol. 16(Issue 38) pp:NaN20585-20585

Publication Date(Web):2014/08/01

DOI:10.1039/C4CP03230F

Unlocking the effects of ancillary electron-donors on light absorption and charge recombination in phenanthrocarbazole dye-sensitized solar cells

Co-reporter:Heng Wu, Lin Yang, Yang Li, Min Zhang, Jing Zhang, Yanchun Guo and Peng Wang

Journal of Materials Chemistry A 2016 - vol. 4(Issue 2) pp:NaN528-528

Publication Date(Web):2015/11/25

DOI:10.1039/C5TA09136E