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Influence of copolymer interface orientation on the optical emission of polymeric semiconductor heterojunctions
被引:56
作者:
Sreearunothai, P
Morteani, AC
Avilov, I
Cornil, J
Beljonne, D
Friend, RH
Phillips, RT
Silva, C
Herz, LM
机构:
[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[2] Univ Mons, Lab Chem Novel Mat, B-7000 Mons, Belgium
[3] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England
基金:
英国工程与自然科学研究理事会;
关键词:
D O I:
10.1103/PhysRevLett.96.117403
中图分类号:
O4 [物理学];
学科分类号:
0702 ;
摘要:
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 (similar to 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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