Transparent Hole-Transporting Frameworks: A Unique Strategy to Design High-Performance Semitransparent Organic Photovoltaics

Pei Cheng, Hao-Cheng Wang, Yuan Zhu, Ran Zheng, Tengfei Li, Chung-Hao Chen, Tianyi Huang, Yepin Zhao, Rui Wang, Dong Meng, Yaowen Li, Chenhui Zhu, Kung-Hwa Wei, Xiaowei Zhan, Yang Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Thanks to the nature of molecular orbitals, the absorption spectra of organic semiconductors are not continuous like those in traditional inorganic semiconductors, which offers a unique application of organic photovoltaics (OPVs): semitransparent OPVs. Recently, the exciting progress of materials design has promoted the development of semitransparent OPVs. However, in the perspective of device engineering, almost all reported works reduce the thickness of back/reflected electrode to obtain high average visible transmittance (AVT), which is a trade-off between power conversion efficiency (PCE) and the transmittance of the whole solar spectrum (visible and infrared), and therefore limit the further development. Herein, a unique strategy of "transparent hole-transporting frameworks" is proposed. A hole-transporting large-bandgap polymer (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA)) is employed to partially replace polymer donors in the active layer of PBDB-T/Y1. PTAA is a p-type polymer with a large bandgap of 2.9 eV; the partial substitution of PBDB-T by PTAA reduces the absorption of the active layer only in the visible region, keeping the hole-transporting pathways as well as the optimized film morphology. As a result, semitransparent OPVs with PCEs of 12% and AVTs of 20% are achieved, both on rigid and flexible substrates. To demonstrate the generality, this strategy is also used in three different active layers.

Original languageEnglish
Article number2003891
Number of pages8
JournalAdvanced Materials
Volume32
Issue number39
DOIs
StatePublished - 19 Aug 2020

Keywords

  • charge transport
  • morphology
  • nonfullerene acceptors
  • organic solar cells
  • semitransparent materials
  • POLYMER SOLAR-CELLS
  • EFFICIENCY
  • AGGREGATION
  • MORPHOLOGY
  • ACCEPTOR

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