Boosting efficiency and stability of 2D alternating cation perovskite solar cells via rational surface-modification: Marked passivation efficacy of anion

Hualin Zheng, Xuefeng Peng, Tingxi Chen, Ting Zhang, Shihao Yuan, Lei Wang, Feng Qian, Jiang Huang, Xiaodong Liu, Zhi David Chen, Yanning Zhang, Shibin Li

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Two-dimensional (2D) alternating cation (ACI) perovskite surface defects, especially dominant iodine vacancies (VI) and undercoordinated Pb2+, limit the performance of perovskite solar cells (PVSCs). To address the issue, 1-butyl-3-methylimidazolium trifluoro-methane-sulfonate (BMIMOTF) and its iodide counterpart (BMIMI) are utilized to modify the perovskite surface respectively. We find that BMIMI can change the perovskite surface, whereas BMIMOTF shows a nondestructive and more effective defect passivation, giving significantly reduced defect density and suppressed charge-carrier nonradiative recombination. This mainly attributes to the marked passivation efficacy of OTF anion on VI and undercoordinated Pb2+, rather than BMIMI+ cation. Benefiting from the rational surface-modification of BMMIMOTF, the films exhibit an optimized energy level alignment, enhanced hydrophobicity and suppressed ion migration. Consequently, the BMIMOTF-modified devices achieve an impressive efficiency of 21.38% with a record open-circuit voltage of 1.195 V, which is among the best efficiencies reported for 2D PVSCs, and display greatly enhanced humidity and thermal stability.

Original languageEnglish
Pages (from-to)354-362
Number of pages9
JournalJournal of Energy Chemistry
Volume84
DOIs
StatePublished - Sep 2023

Bibliographical note

Publisher Copyright:
© 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Keywords

  • 2D ACI perovskite solar cells
  • Charge-carrier nonradiative recombination
  • Energy level alignment
  • Ionic migration
  • Stability
  • Surface defects passivation

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

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