Photovoltage Reversal in Organic Optoelectronic Devices with Insulator-Semiconductor Interfaces

Materials

Qingmiao Nie¹  Laigui Hu²  Chunxiao Cong²  Ran Liu²  Wei Jin²  Guoping Chen²  Zhi-Jun Qiu²  Rui Feng²  Muhammad Zaheer² 

[1] Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China;School of Information Science and Technology, Fudan University, Shanghai 200433, China;

关键词: organic semiconductor;    organic photodiodes;    organic optoelectronic devices;    space-charge;    insulator layer;   

DOI  :  10.3390/ma11091530

来源: DOAJ

【 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.

【 授权许可】

Unknown