π-Conjugated zwitterion for dual-interfacial modification in high-performance perovskite solar cells

Zhao Hu, Biao Yang, Jingsheng Miao, Tingting Li, Muhammad Umair Ali, Chaoyi Yan, Osamu Goto, Clifton Shen, Baomin Xu, Hong Meng, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Interfacial modification of perovskite solar cells (PSCs) with solution-processed zwitterionic materials is an attractive approach to improving device efficiency and stability. However, zwitterionic molecules for multifunctional modification in PSCs have been rarely reported. In this work, a zwitterionic unit is introduced as an acceptor group in a new n-type π-conjugated zwitterion, IT-IN. This newly developed interfacial material can not only act as a high-quality electron transport layers (ETLs) but also enable effective defect passivation of a perovskite film, to reduce the trap densities inside it. By incorporating IT-IN between Ag cathode and PC61BM to constitute a bilayer ETLs, a significant improvement in power conversion efficiency (PCE) of inverted PSCs from 16.68% to 19.60% is achieved. Furthermore, after introducing IT-IN into perovskite films as passivation agent, the PCE of the PSCs is further enhanced to 21.24%. In addition, our fabricated PSCs exhibit excellent stability in air because of the dual-interfacial modification. This work provides new insights on the design and application of multifunctional interface material for efficient and low-cost PSCs.

Original languageEnglish
Article number129153
JournalChemical Engineering Journal
Volume416
DOIs
Publication statusPublished - 15 Jul 2021

Keywords

  • Interfacial modification
  • Passivation
  • Perovskite solar cells
  • Zwitterion

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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