Small Molecule-Induced Modulation of Grain Crystallization and Ion Migration Leads to High-Performance MAPbI3Mini-Modules

Shaoyang Ma, Binghe Ma, Jian Luo, Xingxu Zhang, Nan Zhang, Guofang Fan, Seeram Ramakrishna, Tao Ye

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Perovskites have become a promising light-absorbing material for the fabrication of high-performance solar cells. But, the relatively low film quality of perovskites hinders the fabrication of large-area perovskite solar modules and long-period stability, which further slows down their industrial-scale commercialization. Here, we propose an N,N′-methylenebis(acrylamide) (MBAA) addition strategy for modulating grain crystallization and ion migration within methylammonium lead halide (MAPbI3), resulting in enhanced power conversion efficiency (PCE) and stability of MAPbI3-based solar modules. MBAA can help to form larger perovskite grains with less defects due to strong coordination interactions between the Pb atoms in MAPbI3and the -NH and -CO functional groups in MBAA. We further found that MBAA was located at the surface of perovskite grains, which would block the ion migration (MA+/I-) and the H2O/O2infusion from the ambient-air environment, resulting in enhancements of the PCE and stability of the MAPbI3devices. The mini-module with an active area of 20 cm2exhibits a record PCE of 18.58%. The MBAA-based solar module shows excellent damp heat and operational stabilities and maintains ∼82% and ∼90% of its initial PCE after 1000 h under 85 °C/85% relative humidity and 1000 h working at the maximum power point.

Original languageEnglish
Pages (from-to)9471-9478
Number of pages8
JournalACS Applied Energy Materials
Volume5
Issue number8
DOIs
StatePublished - 22 Aug 2022

Keywords

  • additive engineering
  • grain crystallization
  • ion migration
  • perovskite solar module

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