Tin oxide based organo-lead-halide perovskite solar cells prepared by low temperature solution process
HSIN-WEI CHEN a, Hiroshi Segawa, Takeru Bessho b, Zeguo Tang b
a Department of Multi-Disciplinary Sciences, Graduate School of Arts and Sciences,, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, 153-8902, Tokyo,
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, HSIN-WEI CHEN, 012
Publication date: 7th November 2016

Perovskite solar cells composed of organic-metal-halide materials have made remarkably progress in just a few years with power conversion efficiencies from 3.8%1 in 2009 to a certified 22.1%2 in 2016. Following from the traditional structure of dye-sensitized solar cells, n-type semiconductor anatase TiO2 mesoporous layer was commonly used for delivering high power conversion efficiency for perovskite solar cells. However, disadvantages of the TiO2 mesoporous structure is that it requires a high-temperature (>450ºC) sintering process to improve the interconnection among the nanoparticles3 and burn out the organic binders in paste. Furthermore, the position of conduction band edge between anatase TiO2 to organo-lead-halide perovskite is ~0.1 eV4 which is not satisfyingly enough for electron transfer. Inorganicmetal oxides such as SnO2 is generally used as n-type semiconductor for electronic devaises such as display, which have a deeper conduction band edge than anatase TiO2 and higher mobility of up to 240 cm2 /(V · s). Thus, it could perform more efficient electron transfer from perovskite to electron transport layers, and elimination of hysteresis on the J–V curve due to the enhanced electron extraction by reduction of the energy barrier at the perovskite/electron transportation layer interface.5 In this studies, we report perovskite solar cells structured with SnO2 compact layer made by spray pyrolysis and nano particles mesoporous layer as electron selective layers and its less hysteresis J–V curve. A superior SnO2 compact layer was prepared from tin tetrachloride (SnCl4) solution on the several annealing temperature, and then following with spin-coating SnO2 nanoparticles solution onto compact layer to fabricate the mesoporous SnO2 layer in ambient air condition; furthermore, it was annealed under 180ºC for 30 min. By combining with a triple cation perovskite layer of formamidinium, methylammonium and cesium and optimized SnO2 layers, the resulting best performance of our devices were reached 1.16 V as open circuit voltge, 21.8 mA cm-2 as short circuit current, 72% as fill factor, and 18.1% as power conversion efficiency.

Reference

1. A. Kojima, K. Teshima, Y. Shirai, et al., J. Am. Chem. Soc., 2009, 131, 6050–6051.

2. NREL: National Center For Photovoltaics Home Page. http:// www.nrel.gov/ncpv, Accessed July 30, 2016.

3. M. M. Lee, J. Teuscher, T. Miyasaka, et al., Science, 2012, 338, 643–647.

4. J. P. C. Baena, L. Steier, W. Tress, et al., Energy Environ. Sci., 2015, 8, 2928–2934.

5. Q. Jiang, L. Zhang, H. Wang, et al., Nature Energy, 2016, 2, 16177.



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