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

12 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 (US)
JournalNano Letters
DOIs
StatePublished - Sep 25 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-09-27
Acknowledgements: We acknowledge financial support from the NSF of China (62104197) and the Guangdong Basic and Applied Basic Research Foundation (2020A1515110353; 2023A1515010941).

ASJC Scopus subject areas

  • Bioengineering
  • General Materials Science
  • General Chemistry
  • Mechanical Engineering
  • Condensed Matter Physics

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