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首页> 外文期刊>Journal of Imaging Science and Technology >Organic Photosensor in Elgraphy (I): Amplification of Photocurrent and its Mechanism
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Organic Photosensor in Elgraphy (I): Amplification of Photocurrent and its Mechanism

机译：电化学中的有机光电传感器（I）：光电流的放大及其机理

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摘要

The authors are actively involved in the development of Elgraphy: a novel image acquiring system that combines electrophotography and liquid crystal technology The intermediate medium for image storage in Elgraphy (image receptor) consists of an organic photosensor layer (Elgraphic photosensor) and a liquid-crystal layer. The Elgraphic photosensor, through which a dark current of several μA/cm~2 flows when a voltage of 10 V/μm is applied at room temperature, exhibits marked photocurrent amplification: exposure to light yields a photocurrent greater than the number of photons absorbed. Upon exposure to light, the quantum yield rises very fast and exceeds unity within about 30 msec. The ionization potential of the charge transfer material (CTM) are shown to be related to photocurrent amplification. The state of space charges trapped in the photoconductive layer is probably affected by the diffusion of the CTM into the charge generation layer (CGL). It has been found that several types of deep traps with a trap depth of more than 1 eV play an important role in this phenomenon. The authors propose that these traps capture electrons generated near the electrode/photoconductive layer interface, thus lowering the barrier to hole injection.
机译：作者积极参与Elgraphy的开发：一种结合电子照相和液晶技术的新型图像获取系统。Elgraphy中用于图像存储的中间介质（图像接收器）由有机光电传感器层（Elgraphic光传感器）和液晶组成。层。 Elgraphic光电传感器在室温下施加10 V /μm的电压时会流过几μA/ cm〜2的暗电流，该光电传感器显示出显着的光电流放大率：暴露于光下产生的光电流大于吸收的光子数量。一旦暴露于光，量子产率就非常快地上升并且在约30毫秒内超过单位。电荷转移材料（CTM）的电离电势显示与光电流放大有关。捕获在光电导层中的空间电荷状态可能受到CTM扩散到电荷产生层（CGL）中的影响。已经发现，陷阱深度大于1 eV的几种深陷阱类型在此现象中起着重要作用。作者提出，这些陷阱捕获在电极/光电导层界面附近产生的电子，从而降低了空穴注入的势垒。

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