High Performance All-inorganic CsPbI3 Perovskite Stabilized by (110) Oriented 2D Perovskite
Yixin Zhao a
a Shanghai Jiao Tong University, CN
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Perovskite Thin Film Photovoltaics (ABXPV18). 27-28 Feb
Rennes, France, 2018 February 27th - March 1st
Organizer: Jacky Even
Invited Speaker, Yixin Zhao, presentation 012
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.012
Publication date: 11th December 2017

All-inorganic halide perovskites without volatile compounent could exhibit better stability than organic-inorganic halide perovskites. Among them, α-CsPbI3 with the most suitable band gap for tandem solar cell application faces an issue of phase instability under ambient conditions and requirment of high temperature annealing for crystallization. We discovered that the I excess precursor of PbI2.xHI (x>1.2)could help realize a low temperature crystallization of α-CsPbI3. To further enhence their room temperature stability, a small amount of (11) oriented 2D EDAPbI4 perovskite containing ethylene diamine (EDA) cation stabilizes the α-CsPbI3 to avoid the undesirable formation of the non-perovskite delta phase. Moreover, the 2D perovskite of EDAPbI4 not only facilitate the formation of α-CsPbI3 perovskite films exhibiting high phase stability at room temperature for months and at 100 °C for >150 h, but corresponding α-CsPbI3 perovskite solar cells (PSCs) also display highly reproducible efficiency of 11.8%, a record for all-inorganic lead halide PSCs. Therefore, using the bication EDA presents a novel and promising strategy to design all-inorganic lead halide PSCs with high performance and reliability.

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