Layered optimization strategy enables over 17.8% efficiency of layer-by-layer organic photovoltaics

Xiaoling Ma, Qiuju Jiang, Wenjing Xu, Chunyu Xu, Sang Young Jeong, Han Young Woo, Qinghe Wu, Xiaoli Zhang, Guangcai Yuan, Fujun Zhang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this work, layer-by-layer (LbL) type OPVs are constructed with wide bandgap polymer PNTB6-Cl as donor and nonfullerene material BTP-4F-12 as acceptor. The layered optimization strategy is employed via separately incorporating the diphenyl ether (DPE) and 1,8-diiodooctane (DIO) into PNTB6-Cl chlorobenzene solution and BTP-4F-12 chloroform solution. A power conversion efficiency (PCE) of 17.81% was achieved from the optimal LbL type OPVs with two solvent additives, which should be among the top level for LBL type binary OPVs. The incorporation of DPE and DIO can separately induce more ordered PNTB6-Cl and BTP-4F-12 orientation, which should contribute to charge transport with suppressed charge recombination in active layers. Meanwhile, BTP-4F-12 crystallization is strongly increased with the incorporation of DIO, which should facilitate more swell matrix for exciton diffusion in active layers. Over 13% PCE improvement can be realized in LbL type OPVs by incorporating two additives, benefiting from simultaneously improved short circuit current density (JSC) of 26.89 mA cm−2 and fill factor (FF) of 75.79%. Meanwhile, the PCE of optimized LbL type OPVs is higher than that of 17.33% for the optimized OPVs with bulk-heterojunction (BHJ) configuration, which reveals that layered optimization strategy should be a promising approach to achieve highly efficient LbL type OPVs.

Original languageEnglish
Article number136368
JournalChemical Engineering Journal
Volume442
DOIs
Publication statusPublished - 2022 Aug 15

Keywords

  • Layer-by-layer
  • Molecular arrangement
  • Organic photovoltaics
  • Photon harvesting
  • Solvent additive

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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