Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 208, Issue 8, Pages 1967-1971Publisher
WILEY-BLACKWELL
DOI: 10.1002/pssa.201026724
Keywords
acceptors; C-60; exciton diffusion length; optical properties; organic solar cell
Funding
- Natural Science Foundation of China [50803014]
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Planar copper phthalocyanine (CuPc)/C-60 heterojunction solar cells with a 2 nm layer of bathocuproine (BCP) inserted into the C-60 layer were fabricated and characterized. The 2 nm BCP layer in the devices was used as an electronically selective sieve allowing the electron current through but blocking the excitons in the C-60 layer. By combining the experimental results with the optical modeling, the effective triplet exciton diffusion length in C-60 was confirmed to be 30-35 nm under the device working condition. We demonstrate a simple, useful method to determine the exciton diffusion lengths of organic electron acceptors. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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