A highly photoconductive poly(vinylcarbazole)/2,4,7-trinitro-9-fluorenone Sol-Gel material that follows a classical charge-generation model.
A highly photoconductive poly(vinylcarbazole)/2,4,7-trinitro-9-fluorenone Sol-Gel material that follows a classical charge-generation model.
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DOI：
10.1021/jp0629184
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发表时间：
2006-11
期刊：
影响因子：
--
通讯作者：
G. Ramos;T. Belenguer;D. Levy
中科院分区：
文献类型：
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作者：
G. Ramos;T. Belenguer;D. Levy
报道了一种有机-无机杂化溶胶-凝胶薄膜材料，该材料由聚乙烯咔唑/2，4，7-三硝基-9-芴酮（PVK/TNF）聚合物混合物包埋在SiO2基质中，其孔被有机官能团化学修饰而成。在活性组分TNF、PVK和SiO（2）之间的最佳摩尔比下，在E22 V microm（-）1下获得的最高光敏性为3.4 × 10（-10）cm Ω（-1）W（-1），在任何PVK/TNF基经典光电导材料所报道的最高值范围内。结果表明，PVK/TNF基溶胶-凝胶膜遵循Onsager的经典电荷产生模型。通过这种模型对PVK/TNF基溶胶-凝胶膜的光电流效率（Phi）的分析提供了优化样品的热化对形成的初级量子产率和初始热化对距离，分别为phi（0）= 0.12和r（0）= 66.1埃。作为Onsager分析的结果，在低TNF浓度下实现了光电流产生过程的显著改善。
Highly photoconductive properties are reported for organic-inorganic hybrid sol-gel thin film materials composed of a classical poly(vinylcarbazole)/2,4,7-trinitro-9-fluorenone (PVK/TNF) polymeric mixture, entrapped in a SiO(2) matrix, whose pores have been chemically modified by organic functional groups. The highest photosensitivity obtained, 3.4 x 10(-10) cm Omega(-1) W(-1) at E 22 V microm(-)1, at the optimum molar ratio between the active components, TNF, PVK, and SiO(2), is in the range of the highest values ever reported for any PVK/TNF-based classical photoconductive material. It is demonstrated that the PVK/TNF-based sol-gel films follow Onsager's classical charge-generation model. The analysis of the photocurrent efficiency (Phi) of PVK/TNF-based sol-gel films by such a model provides the primary quantum yield of thermalized pair formation and the initial thermalized pair distance, phi(0) = 0.12 and r(0) = 66.1 Angstrom, respectively, for the optimized sample. As a result of Onsager's analysis, a notorious improvement of the photocurrent generation process was achieved for low TNF concentrations.