Tailoring Electric-Dipole of Hole-Transporting Material p-Dopants for Perovskite Solar Cells

Jianxing Xia, Yi Zhang, Chuanxiao Xiao, Keith Brooks, Min Chen, Junsheng Luo, Hua Yang, Nadja Klipfel, Jihua Zou, Yu Shi, Xiaojun Yao, Jiangzhao Chen, Joseph Luther, Hongzhen Lin, Abdullah Asiri, Chunyang Jia, Mohammad Nazeeruddin

Research output: Contribution to journalArticlepeer-review

36 Scopus Citations

Abstract

Li-TFSI/t-BP are the most widely employed p-dopants for hole-transporting materials (HTMs) within the state-of-the-art perovskite solar cells (PSCs). The hygroscopicity and migration of these dopants, however, lead to devices with limited stability. To solve this problem, we report here on a diphenyl iodide cation and pentafluorophenyl boric acid anion-based dopant (DIC-PBA) with an oriented interfacial dipole moment as an alternative to Li-TFSI/t-BP. Theoretical and experimental data reveal that DIC-PBA exhibits deep doping of poly[bis(4-phenyl)(2,4,6-triMethylphenyl)aMine] (PTAA) and also creates p-doping of perovskite surface, which originates from ionic interactions-derived dipole arrangement that yields fast interfacial charge transport. The improved intrinsic stability of PSCs originates from the inhibition of dipole moment degeneration on the perovskite surface. Devices prepared with DIC-PBA yielded high efficiency of 22.86%, and the modules (aperture area: 33.2 cm2) efficiency reached 19.13%. Importantly, the storage stability also significantly improved exceeding to 90% after aging 1,200 h under air ambient.

Original languageAmerican English
Pages (from-to)1689-1709
Number of pages21
JournalJoule
Volume6
Issue number7
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Inc.

NREL Publication Number

  • NREL/JA-5900-83392

Keywords

  • band blending
  • dipole arrangement
  • internal stability
  • perovskite solar cell
  • PTAA

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