Wide-bandgap donor polymers from organic photovoltaics as dopant-free hole transport layers for perovskite solar cells

Hongtao Lai*, Xin Yang, Liujiang Zhang, Leyu Bi, Binqiang Tian, Huanhuan Wang, Xingyu Gao, Lingfeng Lu, Bin Kan, Xiaofei Ji*, Qiang Fu*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

4 Citations (Scopus)

Abstract

Dopant-free polymer hole transport materials (HTMs) exhibit high thermal stability, hydrophobicity and film-processing capabilities, demonstrating excellent device efficiency and stability in perovskite solar cells (PSCs). Continued innovation of wide-bandgap polymers in organic photovoltaics (OPV) provides a valuable toolbox for developing polymeric HTMs. Here, we propose an effective molecule design for selecting structurally relevant polymers (D18, D18-Cl, PBQx-TCl) available for commercialization. We discover that the highly planar conjugated backbones play a crucial role in regulating the packing orientation of the film relative to the perovskite. The moderate aggregation with face-on packing orientation is conducive to the high-quality film, which is responsible for better contact with perovskite and superior charge extraction and transport. Simultaneously, these polymers with robust passivation enhanced the open circuit voltage (VOC) without additional passivation layers, streamlining the device process. Consequently, a PSC using dopant-free PBQx-TCl HTL demonstrated an efficiency of 24.12 % with a high VOC of 1.20 V and good operational stability (T90 > 600 h). This work reveals transparent structure–function-performance relationships between molecules and devices, paving the way for the subsequent development of high-performance HTMs. © 2024 Elsevier B.V.
Original languageEnglish
Article number151383
JournalChemical Engineering Journal
Volume489
Online published16 Apr 2024
DOIs
Publication statusPublished - 1 Jun 2024

Research Keywords

  • Defect passivation
  • Dopant-free polymer
  • Hole transport
  • Organic photovoltaics
  • Perovskite solar cells

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