Field-enhanced recombination at low temperatures in an organic photovoltaic blend

Article

关键词: CHARGE-CARRIER RECOMBINATION;    MONTE-CARLO;    BIMOLECULAR RECOMBINATION;    SOLAR-CELLS;    TRANSPORT;    POLYMER/FULLERENE;    POLARIZABILITY;    SEMICONDUCTORS;    DEPENDENCE;    DIFFUSION;   

DOI  :  10.1103/PhysRevB.92.125301

来源: SCIE

【 摘 要 】

We report on the nontrivial field dependence of charge-carrier recombination in an organic blend at low temperatures. A new microwave resonance technique for monitoring charge recombination in organic semiconductors at low temperatures is applied in bulk heterojunction poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester blends with results showing that an external electric field can in fact increase recombination. Monte Carlo simulations suggest that this contradiction to conventional wisdom relates to electron-hole pairs that are separated at donor-acceptor interfaces where the electric field acts in synergy with their Coulomb attraction. For this behavior to occur a critical initial separation of similar to 5 nm between the carriers is required.

【 授权许可】

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