Charge-carrier dynamics in polythiophene films studied by in-situ measurement of flash-photolysis time-resolved microwave conductivity (FP-TRMC) and transient optical spectroscopy (TOS)
Charge-carrier dynamics in polythiophene films studied by in-situ measurement of flash-photolysis time-resolved microwave conductivity (FP-TRMC) and transient optical spectroscopy (TOS)
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DOI：
10.1080/14786430500380159
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发表时间：
2006-03-21
影响因子：
1.6
通讯作者：
Tagawa, S
中科院分区：
文献类型：
--
作者：
Saeki, A;Seki, S;Tagawa, S
开发了一种用于闪光光解时间分辨微波电导率（FP-TRMC）和瞬态光谱（TOS）的原位测量系统，可以同时测量有机薄膜中光致电导率和载流子密度的变化。通过静电模拟分析了为本系统设计的谐振腔中的电场。使用本系统和模拟电场，使用一种特定的几何结构在6.39、4.98、3.48和2.34 eV的光子激发能下测量立体规则聚(3-己基噻吩)薄膜的光电导率和瞬态吸收。光生载流子的动力学根据激发能和入射光子强度进行讨论。给出了 3.48 eV 光诱导的瞬态吸收光谱，并与 TRMC 瞬态进行了比较。
An in-situ measurement system for flash-photolysis time-resolved microwave conductivity (FP-TRMC) and transient optical spectroscopy (TOS) has been developed to perform simultaneous measurements of photo-induced changes in conductivity and charge-carrier density in an organic thin film. The electric field in the resonant cavity designed for the present system was analysed by electrostatic simulation. Using the present system and the simulated electric field, the photoconductivity and transient absorption in a regioregular poly(3-hexyl thiophene) film were measured using one particular geometry under photon excitation energies of 6.39, 4.98, 3.48, and 2.34 eV. The dynamics of photogenerated charge carriers is discussed in terms of the excitation energy and incident photon intensity. The transient absorption spectrum induced by 3.48 eV light is presented and compared with the TRMC transient.