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Photovoltage Reversal in Organic Optoelectronic Devices with Insulator-Semiconductor Interfaces

机译:具有绝缘体-半导体接口的有机光电器件中的光电压反转

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摘要

Photoinduced space-charges in organic optoelectronic devices, which are usually caused by poor mobility and charge injection imbalance, always limit the device performance. Here we demonstrate that photoinduced space-charge layers, accumulated at organic semiconductor-insulator interfaces, can also play a role for photocurrent generation. Photocurrent transients from organic devices, with insulator-semiconductor interfaces, were systematically studied by using the double-layer model with an equivalent circuit. Results indicated that the electric fields in photoinduced space-charge layers can be utilized for charge generation and can even induce a photovoltage reversal. Such an operational process of light harvesting would be promising for photoelectric conversion in organic devices.
机译:通常由不良的迁移率和电荷注入不平衡引起的有机光电器件中的光感应空间电荷总是会限制器件的性能。在这里,我们证明有机半导体-绝缘体界面处积累的光致空间电荷层也可以对光电流的产生起到作用。通过使用带有等效电路的双层模型,系统地研究了具有绝缘体-半导体界面的有机器件的光电流瞬变。结果表明,光致空间电荷层中的电场可用于产生电荷,甚至可引起光电压反转。这种光收集的操作过程将有望用于有机器件中的光电转换。

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