Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Organic-inorganic hybrid perovskite has the advantage of being produced at low temperature which can reduce energy consumption. Recently, the power conversion efficiency of perovskite solar cells has been boosted to over 20%. However, it suffers from the unstable issue when the device works under ambient condition. Even though perovskite solar cells have high efficiency, their poor stability restricts their future commercial application. To enhance the stability of perovskite, mixed cations and halides in perovskite has been proven to stabilize the perovskite lattice structure. The pioneer perovskite compound, methylammonium lead triiodide (MAPbI3), is widely-investigated due to its promising optoelectronic properties; however, MAPbI3 decompose easily under moderate temperature and moisture. In the past, researches have demonstrated that additive of Pb(SCN)2 in perovskite could increase the MAPbI3 grain size, reduce defects and improve the perovskite stability.[1-3] Furthermore, the combination of two-dimensional (2D) and three-dimensional (3D) perovskite has been confirmed to enhance the stability as well.[4][5] Thus, in this study, we incorporated a large aromatic cation phenethylammonium (PEA+) into double-cation perovskite (FAPbI3)0.85(MAPbBr3)0.15 and triple-cation perovskite FA0.85MA0.1Cs0.05Pb(Br0.15I0.85)3 for the aim of enhancing stability. We further dope MASCN into multi-cation perovskite to investigate the impact of pseudohalide on the film morphology and device stability. At first, we analyze the stability of double-cation and PEAI-based perovskite from their absorption spectra. It is observed that the color of double-cation perovskite without PEAI doping turns into yellow after 6 days due to distinct degradation of perovskite. In contrast, PEAI-doped perovskite has better stability than double-cation perovskite, indicating that the stability of perovskite films may be enhanced by PEAI dopant. Moreover, we utilize triple-cation perovskite with PEAI dopant to improve the device performance, and compare the stability of perovskite with or without pseudohalide additive of SCN-.
The authors are grateful to the financial support from the Ministry of Science and Technology (MOST 107-2221-E-006-190-MY3 and MOST 107-2119-M-006-002).
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