Influence of Cl Incorporation in Perovskite Precursor on the Crystal Growth and Storage Stability of Perovskite Solar Cells

• DOI: 10.1021/acsami.8b19390
• Publication Date: 2019-01-17T13:39:03Z
• Authors: Hui Zhang; Yifan Lv; Jinpei Wang; Huili Ma; Zhengyi Sun; Wei Huang
• Keywords: Passivation; Crystal (programming language)

Solar cells based on organic-inorganic hybrid lead-halide perovskites are very promising because of their high performance and solution process feasibility. Elemental engineering perovskite composition is a facile path to obtain high-quality crystals for efficient stable solar cells. It was found that partially substituting I- with Cl- in the precursor promoted crystal growth, grain size larger than layer thickness, facilitated generation self-passivation PbI2. Whereas residual ions were suspected diffuse hole-transport consisting ubiquitously spiro-OMeTAD, formation highly bounded ionic pairing oxidized state spiro-OMeTAD led insufficient charge extraction severely reversible degradation. This issue effectively alleviated upon Br- doping owing Pb-Br bonds lattice strengthened phase stability by improving binding energy between each unit. The binary halide (Br-/Cl-)-doped resulted champion power conversion efficiency 20.2% improved long-term storage stability.