Date/Time: 04-04-2018 - Wednesday - 05:00 PM - 07:00 PM
Jian Wen1 Liming Zhao1 Xianyong Zhou1 Baomin Xu1

1, Southern University of Science and Technology, Shenzhan, , China

A novel organic-inorganic hybrid perovskite CH3NH3PbX3 (X = Cl, Br, I) has emerged as a strong competitor in photovoltaic applications due to its superior characteristics including high absorption coefficient, broad absorption spectrum, tunable band gap, long carrier lifetime, high balanced hole and electron mobility, etc.[1, 2] The first embodiment of perovskite solar cells (PSCs) only demonstrated a power conversion efficiency (PCE) of 3.8%, which by now has been boosted to 22.1%.[3-4] However these PCEs have been obtained by using Spiro-OMeTAD as the hole-transporting material (HTM), which is too expensive for mass production. In this work, we designed an HTM-free PSC with the structure of ITO/Cu(mtsc)I-doped CH3NH3PbI3/PCBM/BCP/Ag. Cu(mtsc)I (mtsc: 2-methyl-3-thiosemicarbide) was first synthesized, and then doped into the precursor solution at an extremely low concentration to form a bulk heterojunction type perovskite layer ,and thus the HTM layer is not needed. After optimization, a PCE of 18.33% has been achieved on glass-substrate. Compared to the traditional p-type copper-based semiconductor such as CuI, Cu(mtsc)I has better energy level matching and is easier to form a chelate with the CH3NH3PbX3 material, resulting in much higher power conversion efficiencies.
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[2] G. Xing, N. Mathews, S. Sun, S. S. Lim, Y. M. Lam, M. Gräetzel, S. Mhaisalkar, T. C. Sum, Science 2013, 342, 344.
[3] A. Kojima, K. Teshima, Y. Shirai and T. Miyasaka, Journal of the American Chemical Society, vol. 131, no. 17, pp. 6050-6051, 2009.
[4] W. Yang, B. Park, E. Jung, N. Jeon, Y. Kim, D. Lee, S. Shin, J. Seo, E. Kim, J. Noh and S. Seok, Science, vol. 356, no. 6345, pp. 1376-1379, 2017.
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Meeting Program

5:00 PM–7:00 PM Apr 4, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E