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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Enhanced Performance of Inverted Polymer Solar Cells by Using Poly(ethylene oxide)-Modified ZnO as an Electron Transport Layer

Author

  • Shuyan Shao
  • Kaibo Zheng
  • Tönu Pullerits
  • Fengling Zhang

Summary, in English

In this paper, we report enhanced performance of inverted polymer solar cells composed of poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1):[6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) blends by using poly(ethylene oxide) (PEO)-modified ZnO as an electron transport layer. It is found that PEO modification to the ZnO nanoparticle surface can effectively passivate the surface traps of ZnO, suppress the recombination loss of carriers, reduce the series resistance, and improve the electrical coupling of ZnO/active layer. Consequently, both the short-circuit current (J(SC)) and the fill factor (FF) of the inverted solar cells are considerably improved. The resulting power conversion efficiency (PCE) is improved to 5.64% as compared to 4.5% of the reference device using a ZnO electron transport layer. Moreover, this approach can also successfully improve the J(SC) and FF of anther inverted solar cell composed of poly[N-9 ''-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-dithienyl-2',1',3'-benzothiadiazole)] (PCDTBT):PC71BM blends. The PCE of the device based on the PEO-modified ZnO layer is increased to 6.59% from 5.39% of the reference device based on the ZnO layer.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2013

Language

English

Pages

380-385

Publication/Series

ACS Applied Materials and Interfaces

Volume

5

Issue

2

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • electron transport layer
  • inverted polymer solar cells
  • bulk
  • heterojunction
  • surface modification
  • ZnO
  • traps

Status

Published

ISBN/ISSN/Other

  • ISSN: 1944-8244