Effect of ZnO Electron Extraction Layer on Charge Recombination and Collection Properties in Organic Solar Cells

Weixia Lan, Yang Liu, Bo Wu, Bin Xu, Huayan Pu, Bin Wei, Yan Peng*, Wenjing Tian, Fu Rong ZHU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The effect of zinc oxide (ZnO) electron extraction layer (EEL) on charge recombination and collection properties in bulk-heterojunction (BHJ) organic solar cells (OSCs), based on a poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b′] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7):3′H-cyclopropa[8,25] [5,6]fullerene-C70-D5h(6)-3′-butanoicacid, 3′-phenyl-, methyl ester (PC70BM) blend system, has been analyzed using the transient photocurrent (TPC) and photoinduced charge extraction by linearly increasing voltage (photo-CELIV) measurements. The TPC and photo-CELIV results indicate that the trap-limited bimolecular recombination can be strongly suppressed by interposing a 20 nm thick ZnO EEL between the BHJ and cathode, leading to a 9.4% increase in power conversion efficiency. The presence of ZnO EEL is beneficial in efficient operation of OSCs in two ways: (1) suppressing trap-limited bimolecular recombination and (2) enhancing the charge collection at the organic/cathode interface.

Original languageEnglish
Pages (from-to)7385-7392
Number of pages8
JournalACS Applied Energy Materials
Volume2
Issue number10
DOIs
Publication statusPublished - 28 Oct 2019

Scopus Subject Areas

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

User-Defined Keywords

  • charge collection
  • charge recombination
  • electron extraction layer
  • organic solar cells
  • photo-CELIV

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