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Proceedings Paper

Air-stable efficient polymer solar cells incorporating solution-processed titanium oxide layer
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Paper Abstract

By introducing a titanium oxide (TiOx) layer between the active layer and the aluminum cathode in polymer based electronic devices, we have demonstrated devices with excellent air stability and with enhanced performance. The TiOx layer acts as a shielding and scavenging layer which prevents the intrusion of oxygen and humidity into the electronically active polymers, thereby improving the lifetime of unpackaged devices exposed to air by nearly two orders of magnitude. We have also fabricated polymer tandem solar cells with a power conversion efficiency of 6.5%, with each layer processed from solution. A transparent TiOx layer is used to separate and connect the front cell and the back cell. The TiOx layer serves as an electron transport and collecting layer for the first cell and as a stable foundation that enables the fabrication of the second cell to complete the tandem cell architecture. We use an inverted structure with the low band-gap polymer/fullerene composite as the charge separating layer in the front cell and the high band-gap polymer composite as the charge separating layer in the back cell.

Paper Details

Date Published: 14 November 2007
PDF: 12 pages
Proc. SPIE 6656, Organic Photovoltaics VIII, 665602 (14 November 2007); doi: 10.1117/12.733763
Show Author Affiliations
Kwanghee Lee, Univ. of California, Santa Barbara (United States)
Gwangju Institute of Science and Technology (South Korea)
Jin Young Kim, Univ. of California, Santa Barbara (United States)
Gwangju Institute of Science and Technology (South Korea)
Alan J. Heeger, Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 6656:
Organic Photovoltaics VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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