The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

12 Organic Molecules and Bioelectronics » 12.5 Organic solar cells

[11a-Z11-1~11] 12.5 Organic solar cells

Fri. Sep 11, 2020 8:30 AM - 11:30 AM Z11

Kei Kobayashi(Kyoto Univ.), Yasuhiro Yamada(Chiba Univ.)

9:15 AM - 9:30 AM

[11a-Z11-4] Inverted CsPbI2Br Perovskite Solar Cells with Enhanced Efficiency and Stability in Ambient Atmosphere via Formamidinium Incorporation

〇(D)Chen Mengmeng1 (1.UEC)

Keywords:Wide-bandgap, CsPbI2Br solar cell, stability

CsPbI2Br is expected to be a candidate for the top layer of the all perovskite tandem solar cells. However, the perovskite is prone to change the phase from α (black) to δ (yellow) type. In this research, Cs1-xFAxPbI2Br perovskites were fabricated in the ambient atmosphere, and their properties immediately after fabrication and the phase stability were investigated. The quality of the perovskite films was enhanced and the trap density was reduced after the incorporation of the FA cations. The phase stability of the Cs1-xFAxPbI2Br perovskite was effectively enhanced. Consequently, the highest power conversion efficiency of 12.28% with open-circuit voltage (Voc) of 1.09 V, current intensity (Jsc) of 15.65 mA cm-2, and fill factor of 72% in the planar solar cell based on Cs0.7FA0.3PbI2Br perovskite was achieved. The bandgap was optimized to be about 1.82 eV suitable for all perovskite tandem top layer. Most importantly, all the photovoltaic parameters of Cs0.7FA0.3PbI2Br perovskite solar cells showed ignorable decay after 2 months’ measurement in an ambient atmosphere with the presence of air and humidity without encapsulation.