Exploring the Stability of CuSCN Hole Conductor-Based Perovskite Solar Cells
Woon Seok Yang a, Minsu Jung a b, Sang Il Seok a b, Jun Hong Noh b, Jangwon Seo b, Nam Joong Jeon b, Young Chan Kim b
a School of Energy and Chemical Engineering, UNIST (Ulsan National Institute of Science and Technology), 50 UNIST-gil, Ulsan 44919, Korea, Republic of
b Division of Advanced Materials, KRICT (Korea Research Institute of Chemical Technology), 141 Gajeong-ro, Deajeon 34114, Korea, Republic of
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
Oral, Minsu Jung, presentation 083
Publication date: 7th November 2016

Inorganic-organic hybrid perovskite solar cells (PSCs) have shown dramatic achievements in certified power conversion efficiency (PCE) surpassing 20% in the last four years. However, there remains significant concern on the stability of the PSCs in environmental conditions that must be addressed prior to commercialisation, albeit the meteoric rise of the photovoltaic performance. We demonstrate thermal stability of the perovskite solar cells with high efficiency using copper thiocyanate (CuSCN) as an inorganic hole conductor, which possesses highly stable crystalline structure and robustness even at high temperature (200 °C). The efficient charge separation from perovskite layer into CuSCN has been evidenced by steady-state and time-resolved photoluminescence (PL) measurements with time-correlated single photon counting (TCSPC). The perovskite solar cells with the CuSCN exhibit a maximum 18.0% efficiency comparable to spiro-OMeTAD-based perovskite solar cells (18.4%). The PSCs fabricated with spiro-OMeTAD dropped to 25% of initial PCE after annealing for 2 h at 125 °C in ambient conditions. However, CuSCN-based PSCs were found to retain approximately 60% of initial value, indicating superior thermal stability to spiro-OMeTAD-based PSCs under identical testing conditions. This work demonstrates that high efficiency and improved thermal stability are simultaneously achieved from CuSCN used as an inorganic hole conductor in PSCs. 

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