Strain engineering in perovskite solar cells and its impacts on carrier dynamics

The mixed halide perovskites have emerged as outstanding light absorbers for efficient solar cells. Unfortunately, it reveals inhomogeneity in these polycrystalline films due to composition separation, which leads to local lattice mismatches and emergent residual strains consequently. Thus far, the understanding of these residual strains and their effects on photovoltaic device performance is absent. Herein we study the evolution of residual strain over the films by depth-dependent grazing incident X-ray diffraction measurements. We identify the gradient distribution of in-plane strain component perpendicular to the substrate. Moreover, we reveal its impacts on the carrier dynamics over corresponding solar…

• NN
  National Natural Science Foundation of China

  Awards: 51673025, 61722403 and 11674121, 61722403, 11674121, 51672008, 2016YFB0201204, 2016YFB0700700
• JU
  Jilin University
• BI
  Beijing Institute of Technology

  Awards: 2016YFB0700700, ZDKT18-01
• SK
  State Key Laboratory of Explosion Science and Technology

  Award: ZDKT18-01
• NK
  National Key Research and Development Program of China

  Awards: 51672008, 2016YFB0700700, 2016YFB0201204
• SP
  Shenzhen Peacock Plan

  Award: KQTD2016053015544057
• PF
  Program for Jilin University Science and Technology Innovative Research Team