Co-reporter:Dezeng Li, Zhanqiang Liu, Yaoming Wang, Yongkui Shan, Fuqiang Huang
Journal of Materials Science & Technology 2015 Volume 31(Issue 2) pp:229-234
Publication Date(Web):February 2015
DOI:10.1016/j.jmst.2014.11.003
An effective approach was presented to enhance photoelectric conversion efficiency of Cu(In,Ga)Se2 (CIGS) solar cells by using modified SiO2 antireflection coatings (ARCs) to harvest more incident sunlight. Polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP) used as additives were introduced into silica sols to prepare SiO2–PEG and SiO2–PVP coatings in the sol–gel dip-coating process, respectively. The different effects of PEG and PVP additives on SiO2 coatings were analyzed and the antireflection performance of SiO2–PEG and SiO2–PVP coatings was investigated. The transmittance over 97% ranging from 450 nm to 700 nm with a maximum transmittance over 99.40% at about 550 nm was achieved for both SiO2–PEG2000A and SiO2–PVP0.5 coatings. The relative efficiencies of CIGS solar cells coated with SiO2–PEG2000A and SiO2–PVP0.5 ARCs were increased by 7.27% and 8.33%, respectively. The modified SiO2 ARCs possessed the advantages of the low manufacturing cost, good adhesion, superior antireflective performance and the feasible method for large area fabrication.
Co-reporter:Xin Yin, Jiyong Yao, Yaoming Wang, Chengchun Zhao, Fuqiang Huang
Journal of Luminescence 2012 Volume 132(Issue 7) pp:1701-1704
Publication Date(Web):July 2012
DOI:10.1016/j.jlumin.2012.02.006
A novel red phosphor La2MgTiO6:xEu3+ was successfully synthesized by the conventional solid state method. Excited by ultraviolet (395 nm) and blue (465 nm) light, La2MgTiO6:xEu3+ exhibits intense red emission. Due to the lack of inversion symmetry at the doping sites, the dominant emission peak is from the transition 5D0→7F2. Non-radiative transitions were demonstrated to be from dipole–dipole interactions and the critical distance was estimated to be ∼9.19 Å. When Eu3+ ions' concentration reaches 15%, the emission intensity is about three times higher than that of the conventional phosphor Y2O3:Eu3+. The Commission International de L'Eclairage chromaticity coordinate was calculated to be x=0.657 and y=0.343. All the results indicate that La2MgTiO6:xEu3+ has superior luminescence properties.Highlights► Double perovskite La2MgTiO6:xEu3+ was synthesized by a solid state reaction. ► Red emission from transition 5D0→7F2 was obtained, three times more intense than that of Y2O3:Eu3+. ► CIE chromaticity coordinate of the phosphor showed the high color purity.
Co-reporter:Mingsheng Qin, Chongyin Yang, Yaoming Wang, Zhongtian Yang, Ping Chen, Fuqiang Huang
Journal of Solid State Chemistry 2012 Volume 187() pp:323-327
Publication Date(Web):March 2012
DOI:10.1016/j.jssc.2011.12.026
To explore new series of high-Tc superconductors, Cu-based ternary pnictides of SrCu2Pn2 (Pn=P, As, Sb) with La doping were synthesized at 1073 K from the stoichiometric reaction of the elements. The electrical and magnetic properties as well as the electronic structure were systematically investigated. Absence of superconductive transition was observed over the temperature range from room temperature down to 2 K, and these materials show p-type metal-like conductivity and Pauli paramagnetic behavior. The near EF bands mainly originate from Cu 3d and Pn np states and the value of total densities of states (DOS) becomes higher as Pn goes from P to Sb. The results provides us with considerable information for a better understanding of the transport properties in pnictides.Graphical abstractSr1−xLaxCu2Pn2 (Pn=P, As, Sb) show metal-like conducting behavior and no superconductive transition was observed from 300 K down to 2 K.Highlights► The superconductivity and electronic structure of Sr1−xLaxCu2Pn2 were investigated. ► Sr1−xLaxCu2Pn2 show p-type metal-like conducting behavior and paramagnetism. ► The near EF electronic structure of SrCu2Pn2 mainly originate from Cu 3d and Pn np states.
Co-reporter:Xiaolong Zhu, Zhen Zhou, Yaoming Wang, Lei Zhang, Aimin Li, Fuqiang Huang
Solar Energy Materials and Solar Cells 2012 101() pp: 57-61
Publication Date(Web):
DOI:10.1016/j.solmat.2012.02.015
Co-reporter:Chongyin Yang;Shaotang Li;Dongyun Wan
Journal of Materials Science 2012 Volume 47( Issue 20) pp:7085-7089
Publication Date(Web):2012 October
DOI:10.1007/s10853-012-6385-3
Ternary chalcopyrite-like compound of CuSbSe2 was found to be an excellent agent to assist the reactive sintering of CuInSe2 (CIS) from Cu2Se and In2Se3 at lower temperature, which is the light absorber material in the most promising thin film solar cells. With low melting point and excellent wettability, CuSbSe2 acts as a liquid-phase sintering flux to efficaciously increase atomic diffusion rate during the sintering process, and furthermore the two raw materials provide chemical driving force. By the intentional introduction of CuSbSe2 doping into CuInSe2, the well-crystallized ceramic samples can be perfectly sintered at 500 °C, without obviously scarifying light absorption at the low doping level (≤0.5 mol%). The XPS analyses were performed to determine the crystal lattice location and valence state of Sb. Similar sintering-promoting effect was also found in the CuSbSe2-doped Cu(In,Ga)Se2 (CIGS) film.
Co-reporter:Shangjun Ding;Dr. Yaoming Wang;Dr. Zhanglian Hong;Dr. Xujie Lü;Dr. Dongyun Wan;Dr. Fuqiang Huang
Chemistry - A European Journal 2011 Volume 17( Issue 41) pp:11535-11541
Publication Date(Web):
DOI:10.1002/chem.201101314
Abstract
Amino acids, as a particularly important type of biomolecules, have been used as multifunctional templates to intelligently construct mesoporous TiO2 hollow structures through a simple solvothermal reaction. The structure-directing behaviors of various amino acids were systematically investigated, and it was found that these biomolecules possess the general capability to assist mesoporous TiO2 hollow-sphere formation. At the same time, the nanostructures of the obtained TiO2 are highly dependent on the isoelectric points (pI) of amino acids. Their molecular-structure variations can lead to pI differences and significantly influence the final TiO2 morphologies. Higher-pI amino acids (e.g., L-lysine and L-arginine) have better structure-directing abilities to generate nanosheet-assembled hollow spheres and yolk/shell structures. The specific morphologies and mesopore size of these novel hollow structures can also be tuned by adjusting the titanium precursor concentration. Heat treatment in air and vacuum was further conducted to transform the as-prepared structures to porous nanoparticle-assembled hollow TiO2 and TiO2/carbon nanocomposites, which may be potentially applied in the fields of photocatalysts, dye-sensitized solar cells, and Li batteries. This study provides some enlightenment on the design of novel templates by taking advantage of biomolecules.
Co-reporter:Xiangye Liu, Wei Zhao, Houlei Cui, Yi'an Xie, Yaoming Wang, Tao Xu and Fuqiang Huang
Inorganic Chemistry Frontiers 2015 - vol. 2(Issue 6) pp:NaN584-584
Publication Date(Web):2015/05/14
DOI:10.1039/C5QI90015H
Correction for ‘Organic–inorganic halide perovskite based solar cells – revolutionary progress in photovoltaics’ by Xiangye Liu, et al., Inorg. Chem. Front., 2015, 2, 315–335.
Co-reporter:Xiangye Liu, Wei Zhao, Houlei Cui, Yi'an Xie, Yaoming Wang, Tao Xu and Fuqiang Huang
Inorganic Chemistry Frontiers 2015 - vol. 2(Issue 4) pp:NaN335-335
Publication Date(Web):2015/01/30
DOI:10.1039/C4QI00163J
Photovoltaic technology has been presented with a great opportunity for development, owing to the recent and unprecedented rapid development of a new-type of solar cell based on organic–inorganic halide perovskites. Their power conversion efficiency (η) has surpassed 19% since the first perovskite-based solar cell (η = 3.8%) was reported in 2009. Moreover, this performance seems to be still far from fully optimized because of its versatile fabrication techniques and device configurations. In this review, the history of perovskites for photovoltaic applications and the landmark achievements to date are briefly outlined. Focusing on these new halide perovskite solar absorbers, the crystal structure, electronic structure, and intrinsic physical properties are systematically described, in an attempt to unravel the origins of superior solar cell performance. To meet the requirements of high-efficiency photovoltaics, the unique solar perovskite absorbers and electron and hole transport materials are discussed, as well as some unanswered questions and challenges facing their further development and commercialization.
