Influence of copolymer interface orientation on the optical emission of polymeric semiconductor heterojunctions

We have examined the Coulombic interactions at the interface in a blend of two copolymers with intramolecular charge-transfer character and optimized band offsets for photoinduced charge generation. The combination of both time-resolved measurements of photoluminescence, and quantum-chemical modelin...

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Bibliographic Details
Published in:Physical review letters 2006-03, Vol.96 (11), p.117403-117403, Article 117403
Main Authors: Sreearunothai, P, Morteani, A C, Avilov, I, Cornil, J, Beljonne, D, Friend, R H, Phillips, R T, Silva, C, Herz, L M
Format: Article
Language:English
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Summary:We have examined the Coulombic interactions at the interface in a blend of two copolymers with intramolecular charge-transfer character and optimized band offsets for photoinduced charge generation. The combination of both time-resolved measurements of photoluminescence, and quantum-chemical modeling of the heterojunction allows us to show that relative orientation across the heterojunction can lead to either a repulsive barrier ( approximately 65 meV) or an attractive interaction which can enhance the charge-transfer processes. We conclude that polymer orientation at the heterojunction can be as important as energy-band offsets in determining the dynamics of charge separation and optical emission.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.96.117403