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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Veröffentlicht in:Physical review letters 2006-03, Vol.96 (11), p.117403-117403, Article 117403
Hauptverfasser: Sreearunothai, P, Morteani, A C, Avilov, I, Cornil, J, Beljonne, D, Friend, R H, Phillips, R T, Silva, C, Herz, L M
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container_end_page 117403
container_issue 11
container_start_page 117403
container_title Physical review letters
container_volume 96
creator Sreearunothai, P
Morteani, A C
Avilov, I
Cornil, J
Beljonne, D
Friend, R H
Phillips, R T
Silva, C
Herz, L M
description 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.
doi_str_mv 10.1103/PhysRevLett.96.117403
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title Influence of copolymer interface orientation on the optical emission of polymeric semiconductor heterojunctions
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