Visible to Near‐Infrared Photodetection Based on Ternary Organic Heterojunctions. (26th March 2019)

• Record Type: Journal Article
• Authors: Li, Wei; Xu, Yalun; Meng, Xianyi; Xiao, Zuo; Li, Ruiming; Jiang, Li; Cui, Lihao; Zheng, Meijuan; Liu, Chang; Ding, Liming; Lin, Qianqian
• Is Part Of: Advanced functional materials. Volume 29:Number 20(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-26
• Subjects: broadband -- bulk heterojunctions -- nonfullerene acceptors -- organic photodetectors -- ternary blends; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201808948
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Organic semiconductors have attracted tremendous attention in the past few years, thanks to their excellent flexibility, solution‐processability, low‐cost, chemical versatility, etc. Particularly, organic solar cells based on ternary heterojunctions have shown remarkable device performance, with the recent development of nonfullerene acceptor materials. These novel materials are also promising for photodetection. However, there are several key limits facing organic photodetectors, such as relatively large bandgaps, poor charge transport, and stability. In this work, a novel nonfullerene acceptor—CO i 8DFIC—is introduced, blended with a fullerene derivative and a donor to form ternary heterojunctions. After optimization, photodiodes based on such ternary blends exhibit compelling performance metrics, including low dark current, decent responsivity, large linear dynamic range, fast response, and excellent stability. This device performance is actually on a par with the established silicon technology, suggesting great potential for photodetection and imaging. Abstract : Ternary organic heterojunction based photodiodes are achieved with broadband photoresponse covering the whole visible and near‐infrared range. These photodiodes exhibit enhanced figure of merits, including relatively low dark current and noise, decent responsivity, large linear dynamic range, fast response, and superior stability, indicating remarkable potential for next generation photodetection and imaging.