Hot exciton dissociation in a conjugated polymer
Hot exciton dissociation in a conjugated polymer
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DOI：
10.1103/physrevlett.82.1321
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发表时间：
1999-02-08
影响因子：
8.6
通讯作者：
Bässler, H
中科院分区：
文献类型：
--
作者：
Arkhipov, VI;Emelianova, EV;Bässler, H
建立了一个模型来处理共轭聚合物中光激发的场辅助超快链上解离。将单线态激子以上的多余光子能量转换到聚合物段的振动热浴中，被认为是电荷从由库仑电场和外电场叠加形成的势阱中逸出所需能量的主要来源。计算得到的载流子光生产率随电场的增加而增加，但与温度无关，与地球观测数据的定量一致。(化学。理论物理。[左]，288,147(1998)]弱无序共轭阶梯型聚苯乙烯。[s0031 - 9007(98) 08372 - 0]。
A model has been developed to treat field-assisted ultrafast on-chain dissociation of optical excitations in a conjugated polymer. Conversion of the excess photon energy above the singlet exciton into the vibrational heat bath of a polymer segment is considered as a main source of the energy required fur charges to escape from a potential well formed by a superposition of the Coulomb and external electric fields. The calculated yield of carrier photogeneration increases strongly with increasing field but is independent of the temperature in good quantitative agreement with data obtained by Earth er nl. [Chem. Phys. Lett. 288, 147 (1998)] on weakly disordered conjugated ladder-type poly-phenylene. [S0031-9007(98)08372-0].