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Phys. Rev. Lett. 96, 117403 (2006) [4 pages]Influence of Copolymer Interface Orientation on the Optical Emission of Polymeric Semiconductor Heterojunctions
Received 4 August 2005; published 23 March 2006
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 (~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. ©2006 The American Physical Society
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