Achieving 19% Power Conversion Efficiency in Planar-Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Wei Gao
  • Zhengxing Peng
  • Francis R. Lin
  • Cheng Zhong
  • Werner Kaminsky
  • Zhiqiang Guan
  • Tobin J. Marks
  • Harald Ade

Detail(s)

Original languageEnglish
Article number2202089
Journal / PublicationAdvanced Materials
Volume34
Issue number32
Online published20 Jun 2022
Publication statusPublished - 11 Aug 2022

Abstract

A record power conversion efficiency (PCE) of over 19% is realized in planar-mixed heterojunction (PMHJ) organic solar cells (OSCs) by adopting the asymmetric selenium substitution strategy in making a pseudosymmetric electron acceptor, BS3TSe-4F. The combined molecular asymmetry with more polarizable selenium substitution increases the dielectric constant of the D18/BS3TSe-4F blend, helping lower the exciton binding energy. On the other hand, dimer packing in BS3TSe-4F is facilitated to enable free charge generation, helping more efficient exciton dissociation and lowering the radiative recombination loss (ΔE2) of OSCs. As a result, PMHJ OSCs based on D18/BS3TSe-4F achieve a PCE of 18.48%. By incorporating another mid-bandgap acceptor Y6-O into D18/BS3TSe-4F to form a ternary PMHJ, a higher open-circuit voltage (VOC) can be achieved to realize an impressive PCE of 19.03%. The findings of using pseudosymmetric electron acceptors in enhancing device efficiency provides an effective way to develop highly efficient acceptor materials for OSCs.

Research Area(s)

  • electron acceptors, free charge generation, organic solar cells, planar-mixed heterojunctions, pseudosymmetry

Citation Format(s)

Achieving 19% Power Conversion Efficiency in Planar-Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor. / Gao, Wei; Qi, Feng; Peng, Zhengxing; Lin, Francis R.; Jiang, Kui; Zhong, Cheng; Kaminsky, Werner; Guan, Zhiqiang; Lee, Chun-Sing; Marks, Tobin J.; Ade, Harald; Jen, Alex K.-Y.

In: Advanced Materials, Vol. 34, No. 32, 2202089, 11.08.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review