Reducing the Excitonic Loss at Donor/Acceptor Heterojunction with Negligible Exciton Dissociation Driving Force

Wenyue Xue, Zhuoqiong Zhang, Shu Kong So, Yin Song, Zhixiang Wei, Wei Ma, Han Yan*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

4 Citations (Scopus)

Abstract

A breakthrough for non-fullerene acceptors (NFAs) is their efficient photocharge generation and low nonradiative voltage loss (ΔVnrad) in a condition of negligible energy offset (ΔGS1,CT) between the lowest singlet state (S1) and the relaxed charge transfer (CT) state. This inspires the idea of viewing the donor/acceptor (D/A) binary blend as a single component in organic solar cells (OSCs) and attracts tremendous studies on the D/A pairs with negligible ΔGS1,CT. Unfortunately, an arbitrarily chosen material combination usually results in severe photovoltaic performance loss. To solve this problem, we present a diffused heterojunction (DHJ) doping strategy at the D/A heterojunction with small ΔGS1,CT. The electronic doping alleviates the performance loss by accelerating the exciton dissociation rate and reducing the ΔVnrad. After examining the DHJ doping strategy in other six NFA material combinations, we are confident to point out that our work opens an avenue for pursuing intrinsic high OSC performance comparing with other single-component photovoltaic technologies.

Original languageEnglish
Pages (from-to)9929-9937
Number of pages9
JournalACS Applied Energy Materials
Volume5
Issue number8
Early online date27 Jul 2022
DOIs
Publication statusPublished - 22 Aug 2022

Scopus Subject Areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • doped organic solar cell
  • doping efficiency
  • exciton dissociation
  • molecular doping
  • non-fullerene acceptor
  • nonradiative recombination

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