Effect of organic electron blocking layers on the performance of organic photodetectors with high ultraviolet detectivity. (15th January 2016)

• Record Type: Journal Article
• Authors: Wang, Xiao; Huang, Jiang; Li, Jie; Yu, Junsheng
• Is Part Of: Journal of physics. Volume 49:Number 7(2016)
• Publication Date: 2016-01-15
• Subjects: organic photodetectors -- electron blocking layer -- dark current -- high ultraviolet detectivity; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/7/075102
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: The performance of organic ultraviolet photodetectors (UV-PDs) was investigated by focusing on the role of N, N′-bis-(1-naphthyl)-N, N′-diphenyl-1, 1′-biphenyl-4, 4′-diamine (NPB), N, N′-diphenyl-N, N′-bis(3-methyllphenyl)-(1, 1′-biphenyl)-4, 4′-diamine (TPD), 1, 1-bis((di-4-tolylamino)-phenyl) cyclohexane (TAPC), and 4, 4, 4-tri(N-carbazolyl) triphenylamine) (TCTA) as the electron blocking layers (EBLs). The results showed that the UV-PDs with different EBLs exhibited significant improved electrical characteristics, such as dark current, detectivity and on/off ratio. Moreover, by analyzing the dark current behavior, it was also found that the EBLs can effectively suppress the charge carrier injection from Ag/MoO3 electrode to the active layer. In addition, through optimizing the film thickness of EBL, a high detectivity of 5.59 × 10 12 Jones by 4.53 folds enhancement was achieved.