Document Type

Journal Article

Department/Unit

Department of Physics

Title

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

Language

English

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 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 photo-current (TPC) and photo-induced 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.

Publication Date

2019

Source Publication Title

ACS Applied Energy Materials

Publisher

American Chemical Society

DOI

10.1021/acsaem.9b01383

Link to Publisher's Edition

https://doi.org/10.1021/acsaem.9b01383

ISSN (print)

25740962

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