Improved performance of planar perovskite solar cells using an amino-terminated multifunctional fullerene derivative as the passivation layer

Qi Chen, Wei Wang, Shengqiang Xiao, Yi Bing Cheng, Fuzhi Huang, Wanchun Xiang

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

Organic-inorganic metal-halide perovskite solar cells (PSCs) have been revolutionizing the photovoltaic (PV) community in the past decade. However, the trap states in TiO2 as the electron-transport layer seriously affect the device PV performance and stability. Here, we design and synthesize a fullerene derivative C60NH2 featuring an amino-terminated group. We use C60NH2 as a passivation layer between TiO2 and perovskite in planar PSCs with a standard configuration to improve the quality of the obtained perovskite film as well as the electron-transfer efficiency, resulting in an obvious increment of PV performance and stability of the devices. The champion power conversion efficiency of 18.34% is achieved under 100 mW cm-2 illumination utilizing C60NH2 as the passivation layer with much less hysteresis. Planar PSCs demonstrate superior stability under natural sunlight and 40-50% relative humidity after C60NH2 passivation. This work enriches the choices of materials for interface engineering toward fabrication of planar PSCs with high performance.

Original languageEnglish
Pages (from-to)27145-27152
Number of pages8
JournalACS Applied Materials & Interfaces
Volume11
Issue number30
DOIs
Publication statusPublished - 31 Jul 2019
Externally publishedYes

Keywords

  • fullerene derivative
  • passivation
  • perovskite solar cells
  • power conversion efficiency
  • stability

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