Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):: TiO2 nanocomposites for solar cell applications
Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):: TiO2 nanocomposites for solar cell applications
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DOI：
10.1088/0957-4484/19/37/375201
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发表时间：
2008-09-17
期刊：
影响因子：
3.5
通讯作者：
Ben Ouada, H.
中科院分区：
文献类型：
--
作者：
Dridi, C.;Barlier, V.;Ben Ouada, H.
通过光致发光和电荷输运测量研究了纳米TiO 2颗粒分散在半导体聚合物聚N-乙烯基咔唑（PVK）中的旋涂薄膜中载流子的光生现象。溶剂和二氧化钛颗粒的浓度已被选择，以优化复合物的形态。用四氢呋喃（THF）可以得到大量的小畴，导致大的界面和改善的激子解离。通过电流-电压测量和交流阻抗谱研究了ITO/nc-TiO 2：PVK/Al二极管在低电压和高电压下的电荷输运机制和陷阱分布。在高电压区（1-4 V），输运机制是空间电荷受限的，具有指数陷阱分布，而在低偏压下观察到肖特基过程，势垒高度约为0.9 eV（
The photogeneration of charge carriers in spin-coated thin films of nanocrystalline (nc-) TiO2 particles dispersed in a semiconducting polymer, poly(N-vinylcarbazole) (PVK), has been studied by photoluminescence and charge transport measurements. The solvent and the TiO2 particle concentration have been selected to optimize the composite morphology. A large number of small domains leading to a large interface and an improved exciton dissociation could be obtained with tetrahydrofuran (THF). The charge transport mechanism and trap distribution at low and high voltage in ITO/nc-TiO2:PVK/Al diodes in the dark could be identified by current-voltage measurements and impedance spectroscopy. The transport mechanism is space charge limited with an exponential trap distribution in the high voltage regime (1-4 V), whereas a Schottky process with a barrier height of about 0.9 eV is observed at low bias voltages (