A Novel Organic Phosphonate Additive Induced Stable and Efficient Perovskite Solar Cells with Efficiency over 24% Enabled by Synergetic Crystallization Promotion and Defect Passivation

Caidong Cheng, Yiguo Yao, Lei Li, Qiangqiang Zhao, Chenyang Zhang, Xiuzun Zhong, Qi Zhang, Yajun Gao, Kai Wang

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Defect passivation is crucial to enhancing the performance of perovskite solar cells (PSCs). In this study, we successfully synthesized a novel organic compound named DPPO, which consists of a double phosphonate group. Subsequently, we incorporated DPPO into a perovskite solution. The presence of a P═O group interacting with undercoordinated Pb2+ yielded a perovskite film of superior crystallinity, greater crystal orientation, and smoother surface. Additionally, the addition of DPPO can passivate defect states and enhance upper layer energy level alignment, which will improve carrier extraction and prevent nonradiative recombination. Consequently, an impressive champion efficiency of 24.24% was achieved with a minimized hysteresis. Furthermore, the DPPO-modified PSCs exhibit enhanced durability when exposed to ambient conditions, maintaining 95% of the initial efficiency for 1920 h at an average relative humidity (RH) of 30%.

Original languageEnglish
Pages (from-to)8850-8859
Number of pages10
JournalNano Letters
Volume23
Issue number19
DOIs
StatePublished - 11 Oct 2023

Keywords

  • band alignment
  • defect passivation
  • perovskite solar cell
  • phosphonate molecule
  • regulate crystallization

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