Hu Laigui, Jin Wei, Feng Rui, Zaheer Muhammad, Nie Qingmiao, Chen Guoping, Qiu Zhi-Jun, Cong Chunxiao, Liu Ran
School of Information Science and Technology, Fudan University, Shanghai 200433, China.
Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China.
Materials (Basel). 2018 Aug 25;11(9):1530. doi: 10.3390/ma11091530.
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.
有机光电器件中的光致空间电荷通常是由迁移率低和电荷注入不平衡引起的，这一直限制着器件性能。在此我们证明，在有机半导体-绝缘体界面处积累的光致空间电荷层也可以在光电流产生中发挥作用。通过使用具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电荷产生，甚至可引起光电压反转。这种光捕获的操作过程对于有机器件中的光电转换将是很有前景的。
