Search

Your search keyword '"Pang, Shuping"' showing total 450 results
Start Over Author "Pang, Shuping"
450 results on '"Pang, Shuping"'

156. Reproducible one-step fabrication of compact MAPbI3-xClx thin films derived from mixed-lead-halide precursors

Author

Wang, Dong, Liu, Zhihong, Zhou, Zhongmin, Zhu, Huimin, Zhou, Yuanyuan, Huang, Changshui, Wang, Zaiwei, Xu, Hongxia, Jin, Yizheng, Fan, Bin, Pang, Shuping, Cui, Guanglei, Wang, Dong, Liu, Zhihong, Zhou, Zhongmin, Zhu, Huimin, Zhou, Yuanyuan, Huang, Changshui, Wang, Zaiwei, Xu, Hongxia, Jin, Yizheng, Fan, Bin, Pang, Shuping, and Cui, Guanglei

Abstract

Methylammonium lead trihalide perovskites are attracting intensive interest due to its high photovoltaic performance, low cost and one-step solution processability. Since the morphology of the perovskite thin films play the central role on the cell performance, a plethora of methods have been developed to fabricate uniform perovskite film. Herein, we demonstrate that an innovative approach by applying mixed lead salts (PbI2 + PbCl2) to facilitate reproducible fabrication of compact perovskite thin film. It is proposed that rapid reaction kinetics of PbI2 with MAI enables preformation of perovskite within the intermidiate film matrix, working as homogeneously located domains for squential growth of the PbCl2-derived perovskite. The as-prepared perovskite film exhibited a overall textured crystal morphology and superior compactness, which enables excellent light absorption and long-time preservation of photogenerated charge carriers and therefore exhibits 11% efficiency in planar-structured solar cells. The annealing testing shows the film also possesses very stable morphology upon long-time heating, indicative of the insensitivity of our new protocol to the preparation condition and also the promising thermal stability of its based solar cells. The simplicity of the one-step solution-processing and the high morphology stability of the as-prepared perovskite film endow this mixing lead salts method with feasibility of the large-scale fabrication. © 2014 American Chemical Society.

Published
2014

157. One-step, solution-processed formamidinium lead trihalide (FAPbI(3-x)Clx) for mesoscopic perovskite-polymer solar cells

Author

Lv, Siliu, Pang, Shuping, Zhou, Yuanyuan, Padture, Nitin P., Hu, Hao, Wang, Li, Zhou, Xinhong, Zhu, Huimin, Zhang, Lixue, Huang, Changshui, Cui, Guanglei, Lv, Siliu, Pang, Shuping, Zhou, Yuanyuan, Padture, Nitin P., Hu, Hao, Wang, Li, Zhou, Xinhong, Zhu, Huimin, Zhang, Lixue, Huang, Changshui, and Cui, Guanglei

Abstract

Formamidinium (FA) lead triiodide perovskite with chlorine addition (NH2CH=NH2PbI(3-x)Clx) is employed as a light harvester in mesoscopic solar cells for the first time. It is demonstrated that a phase-pure FAPbI(3-x)Clx perovskite layer can be synthesized using a one-step solution-process at 140 °C, and the resultant solar cells deliver a maximum power conversion efficiency of 7.51%, which is the most efficient formamidinium-lead-halide perovskite mesoscopic solar cell employing a polymer hole-transporting layer. The effects of the thermal annealing temperature on the quality/morphology of the perovskite layer and the solar cells performance are discussed. The advantages offered by the one-step solution-processing method and the reduced bandgap make FAPbI(3-x)Clx perovskites an attractive choice for future hybrid photovoltaics. © the Partner Organisations 2014.

Published
2014

158. Vapour-based processing of hole-conductor-free CH3NH3PbI3 perovskite/C60 fullerene planar solar cells

Author

Hu, Hao, Wang, Dong, Zhou, Yuanyuan, Zhang, Jiliang, Lv, Siliu, Pang, Shuping, Chen, Xiao, Liu, Zhihong, Padture, Nitin P., Cui, Guanglei, Hu, Hao, Wang, Dong, Zhou, Yuanyuan, Zhang, Jiliang, Lv, Siliu, Pang, Shuping, Chen, Xiao, Liu, Zhihong, Padture, Nitin P., and Cui, Guanglei

Abstract

A new sequential-vapour-deposition method is demonstrated for the growth of high-quality CH3NH3PbI3 perovskite films. This has enabled the all-vapour, low-temperature fabrication of hole-conductor-free planar perovskite solar cells consisting of only a CH3NH 3PbI3/C60 bi-layer sandwiched between two electrical contacts, with a power conversion efficiency of 5.4%. © 2014 The Royal Society of Chemistry.

Published
2014

159. Direct observation of ferroelectric domains in solution-processed CH3NH3PbI3 perovskite thin films

Author

Kutes, Yasemin, Ye, Linghan, Zhou, Yuanyuan, Pang, Shuping, Huey, Bryan D., Padture, Nitin P., Kutes, Yasemin, Ye, Linghan, Zhou, Yuanyuan, Pang, Shuping, Huey, Bryan D., and Padture, Nitin P.

Abstract

A new generation of solid-state photovoltaics is being made possible by the use of organometal-trihalide perovskite materials. While some of these materials are expected to be ferroelectric, almost nothing is known about their ferroelectric properties experimentally. Using piezoforce microscopy (PFM), here we show unambiguously, for the first time, the presence of ferroelectric domains in high-quality CH3NH3PbI3 perovskite thin films that have been synthesized using a new solution-processing method. The size of the ferroelectric domains is found to be about the size of the grains (∼100 nm). We also present evidence for the reversible switching of the ferroelectric domains by poling with DC biases. This suggests the importance of further PFM investigations into the local ferroelectric behavior of hybrid perovskites, in particular in situ photoeffects. Such investigations could contribute toward the basic understanding of photovoltaic mechanisms in perovskite-based solar cells, which is essential for the further enhancement of the performance of these promising photovoltaics. © 2014 American Chemical Society.

Published
2014

162. Refractive index and extinction coefficient of CH_3NH_3PbI_3 studied by spectroscopic ellipsometry

Author

Liu Shifeng, Wang Wei, G. G. Qin, Du Honglin, Xie Ziang, Chen Zhi-Jian, Pang Shuping, Wang Shu-Feng, Yan Yu, Yu Minghui, Qin Laixiang, and Yao Li

Subjects
Materials science, Band gap, business.industry, Analytical chemistry, Molar absorptivity, Evaporation (deposition), Electronic, Optical and Magnetic Materials, Optics, Attenuation coefficient, Dispersion (optics), Thin film, business, Refractive index, Visible spectrum
Abstract

Research concerning CH3NH3PbI3 solar cells (SCs) has attracted great attention. However, the CH3NH3PbI3 material’s critical dispersion relationships, i.e. the refractive index and the extinction coefficient, n(λ) and k(λ), as functions of λ, have been little studied. Without this knowledge, it will be difficult to quantitively investigate the optical properties of the CH3NH3PbI3 SCs. We studied n(λ) and k(λ) of CH3NH3PbI3 with spectroscopic ellipsometry. The CH3NH3PbI3 film was fabricated by dual-source evaporation, and the surface roughness was investigated to facilitate SE modeling. With the acquired n(λ) and k(λ), we applied the finite difference time domain method to calculate the ultimate efficiency, η(d), without considering carrier recombination, of the planar CH3NH3PbI3 SC as a function of the film thickness, d, from 31.25 nm to 2 μm, and compared with those of GaAs, c-Si, and a-Si:H(10%H) SCs. It is demonstrated that, η(d) for CH3NH3PbI3 SC is a little smaller than, but very close to that for the GaAs SC, however, much larger than that for the c-Si SC, for all d calculated; and much larger than that for the a-Si:H(10%H) SC when d > 100 nm. Apart from an appropriate band gap near 1.5 eV, the larger k(λ) and smaller n(λ) of CH3NH3PbI3 explain why the CH3NH3PbI3 SC has high efficiency.

Published
2014

163. CH3NH2 gas induced (110) preferred cesium-containing perovskite films with reduced PbI6 octahedron distortion and enhanced moisture stability.

Author

Chang, Yue, Wang, Li, Zhang, Jiliang, Zhou, Zhongmin, Li, Chongwen, Chen, Bingbing, Etgar, Lioz, Cui, Guanglei, and Pang, Shuping

Abstract

We report here the discovery of a fancy interaction between cesium iodide (CsI) and methylamine (CH3NH2) due to the presence of the hydrogen bond. The formed CsI·xCH3NH2 is a liquid phase, which facilitates the large scale fabrication of highly uniform cesium-containing perovskite films with strong (110) preferred orientation by the CH3NH2 gas healing process. With this method, at most 10% nonpolar Cs cations could fully dope into the crystal lattice and extremely enhance the interaction of the inorganic framework with a more symmetrical PbI6 octahedron, resulting in obvious improvement in moisture stability under continuous illumination. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

164. Heterojunction-Depleted Lead-Free Perovskite Solar Cells with Coarse-Grained B-γ-CsSnI3 Thin Films.

Author

Wang, Ning, Zhou, Yuanyuan, Ju, Ming‐Gang, Garces, Hector F., Ding, Tao, Pang, Shuping, Zeng, Xiao Cheng, Padture, Nitin P., and Sun, Xiao Wei

Subjects
SOLAR cell design, ELECTRIC properties, PEROVSKITE, PHOTOVOLTAIC power generation, OSTWALD ripening, THIN film crystallography, LEAD-free electronics manufacturing processes
Abstract

Perovskite solar cells (PSCs) have been emerging as a breakthrough photovoltaic technology, holding unprecedented promise for low-cost, high-efficiency renewable electricity generation. However, potential toxicity associated with the state-of-the-art lead-containing PSCs has become a major concern. The past research in the development of lead-free PSCs has met with mixed success. Herein, the promise of coarse-grained B-γ-CsSnI3 perovskite thin films as light absorber for efficient lead-free PSCs is demonstrated. Thermally-driven solid-state coarsening of B-γ-CsSnI3 perovskite grains employed here is accompanied by an increase of tin-vacancy concentration in their crystal structure, as supported by first-principles calculations. The optimal device architecture for the efficient photovoltaic operation of these B-γ-CsSnI3 thin films is identified through exploration of several device architectures. Via modulation of the B-γ-CsSnI3 grain coarsening, together with the use of the optimal PSC architecture, planar heterojunction-depleted B-γ-CsSnI3 PSCs with power conversion efficiency up to 3.31% are achieved without the use of any additives. The demonstrated strategies provide guidelines and prospects for developing future high-performance lead-free PVs. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

175. Electrodeposition of nanostructured cobalt selenide films towards high performance counter electrodes in dye-sensitized solar cells

Author

Zhang, Zhongyi, primary, Pang, Shuping, additional, Xu, Hongxia, additional, Yang, Zhenzhong, additional, Zhang, Xiaoying, additional, Liu, Zhihong, additional, Wang, Xiaogang, additional, Zhou, Xinhong, additional, Dong, Shanmu, additional, Chen, Xiao, additional, Gu, Lin, additional, and Cui, Guanglei, additional

Published
2013
Full Text
View/download PDF

178. Transition-metal nitride nanoparticles embedded in N-doped reduced graphene oxide: superior synergistic electrocatalytic materials for the counter electrodes of dye-sensitized solar cells

Author

Zhang, Xiaoying, primary, Chen, Xiao, additional, Zhang, Kejun, additional, Pang, Shuping, additional, Zhou, Xinhong, additional, Xu, Hongxia, additional, Dong, Shanmu, additional, Han, Pengxian, additional, Zhang, Zhongyi, additional, Zhang, Chuanjian, additional, and Cui, Guanglei, additional

Published
2013
Full Text
View/download PDF

179. Thin-Film Transformation of NH4PbI3 to CH3NH3PbI3 Perovskite: A Methylamine-Induced Conversion-Healing Process.

Author

Zong, Yingxia, Zhou, Yuanyuan, Ju, Minggang, Garces, Hector F., Krause, Amanda R., Ji, Fuxiang, Cui, Guanglei, Zeng, Xiao Cheng, Padture, Nitin P., and Pang, Shuping

Subjects
METHYLAMINES, POLYCRYSTALS, PEROVSKITE, THIN films, METHYLAMMONIUM
Abstract

Methylamine-induced thin-film transformation at room-temperature is discovered, where a porous, rough, polycrystalline NH4PbI3 non-perovskite thin film converts stepwise into a dense, ultrasmooth, textured CH3NH3PbI3 perovskite thin film. Owing to the beneficial phase/structural development of the thin film, its photovoltaic properties undergo dramatic enhancement during this NH4PbI3-to-CH3NH3PbI3 transformation process. The chemical origins of this transformation are studied at various length scales. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

180. A balanced cation exchange reaction toward highly uniform and pure phase FA1−xMAxPbI3 perovskite films.

Author

Ji, Fuxiang, Wang, Li, Pang, Shuping, Gao, Peng, Xu, Hongxia, Xie, Guangwen, Zhang, Jidong, and Cui, Guanglei

Abstract

Unlike traditional MAPbI3, methods for large scale fabrication of high quality FA based perovskite films are still lacking. In this paper, the organic cation exchange temperature is optimized toward the formation of highly uniform FA based perovskite films. Under optimized conditions, the cation diffusion speed within the perovskite film is extremely enhanced and the time constant is reduced ∼20 times. The shortened dipping time and mild reaction conditions can efficiently restrict the undesirable phase transition and preserve the film morphology. Fundamental insight into this solid–liquid reaction has been obtained by combining photophysical, XRD and SEM characterizations. The optimized FAxMA1−xPbI3 with x≈ 0.75 presents the highest efficiency of 15.5% with less hysteresis. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

182. Lithium storage in a highly conductive Cu3Ge boosted Ge/graphene aerogel.

Author

Zhang, Chuanjian, Fu, Lin, Hu, Pu, Pang, Shuping, Cui, Guanglei, and Chai, Fenglian

Abstract

A Cu3Ge/Ge@G aerogel was employed as an anode for a lithium-ion battery by a simple pyrolysis of a CuGeO3 nanowire and graphene oxide nanosheet mixture. It is demonstrated that both the Cu3Ge nanoparticles and graphene nanosheets act as conductive buffers to accelerate the electron migration rate and enhance the cycling stability of the electrode. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

186. Nanostructured Titanium Nitride/PEDOT:PSS Composite Films As Counter Electrodes of Dye-Sensitized Solar Cells

Author

Xu, Hongxia, primary, Zhang, Xiaoying, additional, Zhang, Chuanjian, additional, Liu, Zhihong, additional, Zhou, Xinhong, additional, Pang, Shuping, additional, Chen, Xiao, additional, Dong, Shanmu, additional, Zhang, Zhongyi, additional, Zhang, Lixue, additional, Han, Pengxian, additional, Wang, Xiaogang, additional, and Cui, Guanglei, additional

Published
2012
Full Text
View/download PDF

200. Methylamine-Gas-Induced Defect-Healing Behavior of CH3NH3PbI3 Thin Films for Perovskite Solar Cells.

Author

Zhou, Zhongmin, Wang, Zaiwei, Zhou, Yuanyuan, Pang, Shuping, Wang, Dong, Xu, Hongxia, Liu, Zhihong, Padture, Nitin P., and Cui, Guanglei

Subjects
METHYLAMINES, PEROVSKITE, SOLAR cells, THIN films, CHEMICAL reactions
Abstract

We report herein the discovery of methylamine (CH3NH2) induced defect-healing (MIDH) of CH3NH3PbI3 perovskite thin films based on their ultrafast (seconds), reversible chemical reaction with CH3NH2 gas at room temperature. The key to this healing behavior is the formation and spreading of an intermediate CH3NH3PbI3⋅ xCH3NH2 liquid phase during this unusual perovskite-gas interaction. We demonstrate the versatility and scalability of the MIDH process, and show dramatic enhancement in the performance of perovskite solar cells (PSCs) with MIDH. This study represents a new direction in the formation of defect-free films of hybrid perovskites. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results