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

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
Main Authors: Sreearunothai, P, Morteani, A, Avilov, I, Cornil, J, Beljonne, D, Friend, R, Phillips, RT, Silva, C, Herz, L
Format: Journal article
Language:English
Published: 2006
Description
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.

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