Issue 21, 2013

Conjugated polyelectrolyte and zinc oxide stacked structure as an interlayer in highly efficient and stable organic photovoltaic cells

Abstract

A highly efficient and stable inverted organic photovoltaic cell has been demonstrated by incorporating a zinc oxide (ZnO)/conjugated polyelectrolyte (CPE) stacked structure as an electron-transporting layer. The CPE not only improved the electron collection efficiency in inverted devices but also smoothened the ZnO surfaces, thereby reducing the leakage current and improving the device reliability. In this work, two CPEs, poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN) and poly[3-(6-trimethylammoniumhexyl)thiophene] (PTMAHT), are used, and three different interlayers, ZnO, ZnO/PFN, and ZnO/PTMAHT, are systematically studied. By coating PFN onto the ZnO surface, a high power conversion efficiency of 8.54% (with a fill factor of 73%) and ∼17% efficiency improvement are achieved in thieno[3,4-b]-thiophene/benzodithiophene copolymer, PTB7, and [6,6]-phenyl C71 butyric acid methyl ester bulk heterojunction solar cells, along with excellent stability.

Graphical abstract: Conjugated polyelectrolyte and zinc oxide stacked structure as an interlayer in highly efficient and stable organic photovoltaic cells

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2013
Accepted
27 Mar 2013
First published
27 Mar 2013

J. Mater. Chem. A, 2013,1, 6446-6451

Conjugated polyelectrolyte and zinc oxide stacked structure as an interlayer in highly efficient and stable organic photovoltaic cells

Y. Chang and C. Leu, J. Mater. Chem. A, 2013, 1, 6446 DOI: 10.1039/C3TA10537G

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