Enhanced photomultiplication of organic photodetectors via phosphorescent material incorporation. Issue 47 (16th November 2021)

• Record Type: Journal Article
• Authors: Wang, Jian; Liu, Ming; Chen, Jun; Son, Jae Hoon; Jeong, Sang Young; Xiao, Jing; Chen, Liang; Yang, Kaixuan; Zhao, Zijin; Woo, Han Young; Zhang, Xiaoli; Zhang, Fujun
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 47(2021)
• Page Start: 16918
• Page End: 16924
• Publication Date: 2021-11-16
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc04524e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The key performance parameters of PM-OPDs were markedly enhanced by introducing the phosphorescent material FIrpic in the active layer, and the corresponding device exhibited high-quality imaging by utilizing imaging systems without current preamplifiers. Abstract : Photomultiplication organic photodetectors (PM-OPDs) were successfully constructed with a planar structure of PBDB-T/ITIC-Br as the active layer sandwiched by electrodes. Some isolated electron traps near the top surface of PBDB-T will be formed because small content ITIC-Br will permeate into PBDB-T layer prepared by sequential spin-coating method. The PM-OPDs achieve an external quantum efficiency (EQE) of 260% at 360 nm under a −9 V bias. The phosphorescent material FIrpic was incorporated into the PBDB-T layer to adjust the PBDB-T molecular arrangement for enhancing the hole mobility in the active layer. The optimal PM-OPDs with PBDB-T : FIrpic (100 : 10, wt/wt) display an EQE value of 2500% at 360 nm under a −9 V bias. A linear dynamic range (LDR) of 137 dB and a specific detectivity ( D *) of 4.2 × 10 12 Jones are also achieved in PM-OPDs with PBDB-T : FIrpic (100 : 10, wt/wt). Moreover, high-quality imaging with the PM-OPDs as photosensitive element was realized by utilizing imaging systems without current preamplifiers, indicating that the PM-OPDs have potential applications in imaging.