Journal
ORGANIC ELECTRONICS
Volume 11, Issue 4, Pages 700-704Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2009.12.023
Keywords
Organic solar cells; Organic photovoltaic cells; Exciton transfer; Excitation transfer; Energy transfer; Forster resonant excitation transfer
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- JST PRESTO
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We incorporated an additional p-type organic semiconductor layer (APL) between the anode and the phthalocyanine layer, which is an indispensable p-type semiconductor layer (IPL) in forming a p/n junction with a fullerene C(60) layer. We used two thiophene/phenylene co-oligomers as the APL. The incorporation increases the short-circuit current density (J(SC)) and enhances incident photon-current conversion efficiency (IPCE) over the wavelength region where the APL shows strong absorption. Combined dependence of the APL/IPL implies that Forster resonance excitation transfer is the main factor in J(SC) and IPCE enhancements. We demonstrate clearly that the 'positive' hole injection barrier at the interface between the APL and the IPL impacts the smooth transportation of holes to the indium-tin-oxide anode. However, the small positive hole barrier of 0.1 eV has no noticeable influence on the fill factor of the current density versus voltage characteristic under photoirradiation, or on those devices with 'negative' hole barriers. (C) 2009 Elsevier B. V. All rights reserved.
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