Deng MING, Zhong JIAN^*, Gan FENGYU, Cheng HONGXUE, and Wang LIJUAN

State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P. R. China

(Received February 11, 2014; Revised May 14, 2014; Accepted June 9, 2014)

In this paper, photovoltaic characteristics of ITO/PEDOT:PSS/SubPc:Rubrene (mixed ratio R by weight)/C₆₀/Bphen/Ag organic solar cells (OSCs) are analyzed in detail. The intrinsic properties of a SubPc:rubrene doped layer on device performance were discussed based on theoretical analysis of the experimental OSCs. The ratio R was 0, 0.25, 0.5, and 0.75,1, respectively. The results showed that when R was 0.75 performing the best, which owned the highest short circuit current (J_sc) 6.61 mA/cm² and highest power conversion efficiency (PCE) 2.44%, the FF was 41% and the open circuit current (V_oc) was 0.905 V. The suitable HOMO level, absorption capacity, carrier transport ability and exciton diffusion length (L_D) of organic material are very important for the performance of the device.

Key words: SubPc, rubrene, hybrid donor layer, HOMO, exciton diffusion length, absorption capacity, carrier transport ability

^*E-mail address: zhongjian@uestc.edu.cn