Built-in potential shift and Schottky-barrier narrowing in organic solar cells with UV-sensitive electron transport layers

Title
Built-in potential shift and Schottky-barrier narrowing in organic solar cells with UV-sensitive electron transport layers
Authors
Cheng LiDan Credgington고두현Zhuxia RongJianpu WangNeil C. Greenham
Issue Date
2014-06
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 16, NO 24, 12131-12136
Abstract
The performance of organic solar cells incorporating solutionprocessed titanium suboxide (TiOx) as electron-collecting layers can be improved by UV illumination. We study the mechanism of this improvement using electrical measurements and electroabsorption spectroscopy. We propose a model in which UV illumination modifies the effective work function of the oxide layer through a significant increase in its free electron density. This leads to a dramatic improvement in device power conversion efficiency through several mechanisms – increasing the built-in potential by 0.3 V, increasing the conductivity of the TiOx layer and narrowing the interfacial Schottky barrier between the suboxide and the underlying transparent electrode. This work highlights the importance of considering Fermi-level equilibration when designing multi-layer transparent electrodes.
URI
http://pubs.kist.re.kr/handle/201004/47983
ISSN
14639076
Appears in Collections:
KIST Publication > Article
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