Carbazole-Based Hole Transport Polymer for Methylammonium-Free Tin-Lead Perovskite Solar Cells with Enhanced Efficiency and Stability

Jiantao Wang, Zhenhua Yu, Daniel Astridge, Zhenyi Ni, Liang Zhao, Bo Chen, Mengru Wang, Ying Zhou, Guang Yang, Xuezeng Dai, Alan Sellinger, Jinsong Huang

Research output: Contribution to journalArticlepeer-review

33 Scopus Citations

Abstract

As the most commonly used hole transport material (HTM) in tin-lead (Sn-Pb) perovskite solar cells (PSCs), poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) limits the power conversion efficiency (PCE) and stability of the PSCs due to its acidic characteristics. Herein, an easily synthesized polymer HTM poly[(phenyl)imino[9-(2-ethylhexyl)carbazole]-2,7-diyl] (CzAn) with a shallow highest occupied molecular orbital (HOMO) level of -4.95 eV is used in a p-i-n structure, methylammonium-free, Sn-Pb PSC to replace PEDOT:PSS. Upon optimization using doping and surface engineering, high quality Sn-Pb PSCs could be successfully fabricated, boosting the PCE to 22.6% (stabilized PCE of 21.3%) compared with 21.2% for PEDOT:PSS. The perovskite films prepared on the modified CzAn HTM possess improved crystallinity, reduced trap-state density, and larger carrier mobility resulting in PSCs with greatly improved stability.
Original languageAmerican English
Pages (from-to)3353-3361
Number of pages9
JournalACS Energy Letters
Volume7
Issue number10
DOIs
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5900-84532

Keywords

  • carrier mobility
  • crystallinity
  • hole transport material
  • perovskite solar cells
  • power conversion efficiency
  • stability
  • trap-state density

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