Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells

• DOI: 10.1002/advs.201903250
• Publication Date: 2020-03-10T10:24:59Z
• Authors: Guohua Wu; Hua Li; Jian Cui; Yaohong Zhang; Selina Olthof; Shuai Chen; Zhike Liu; Dapeng Wang; Shengzhong (Frank...
• Keywords: Sublimation; Thioglycolic acid; Glycolic acid

A strategy for efficaciously regulating perovskite crystallinity is proposed by using a volatile solid glycolic acid (HOCH2COOH, GA) in an FA0.85MA0.15PbI3 (FA: HC(NH2)2; MA: CH3NH3) precursor solution that different from the common additive approach. Accompanied with first dimethyl sulfoxide sublimation process, subsequent of GA before 150 °C film can artfully regulate without any residual after annealing. The improved formation upon modification induced strong interaction between and Pb2+ delivers champion power conversion efficiency (PCE) as high 21.32%. In order to investigate role volatility solar cells (PSCs), nonvolatile thioglycolic (HSCH2COOH, TGA) similar structure utilized reference. Large grains are obtained TGA but obvious pinholes, which directly leads increased defect density accompanied decline PCE. Encouragingly, PCE achieved GA-based PSC device (21.32%) almost 13% or 20% higher than those control TGA-based device. addition, GA-modified PSCs exhibit best stability light-, thermal-, humidity-based tests due formation.