Solution-processed broadband polymer photodetectors with a spectral response of up to 2.5 μm by a low bandgap donor–acceptor conjugated copolymer. Issue 14 (20th March 2018)

• Record Type: Journal Article
• Authors: Zheng, Luyao; Zhu, Tao; Xu, Wenzhan; Liu, Lei; Zheng, Jie; Gong, Xiong; Wudl, Fred
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 14(2018)
• Page Start: 3634
• Page End: 3641
• Publication Date: 2018-03-20
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc00437d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Solution-processed polymer PDs with a spectral response ranging from 350 nm to 2500 nm. Abstract : Photodetectors (PDs) with infrared (IR) response have extensive industrial and scientific applications. Broadband polymer PDs that operate at room temperature have drawn the greatest attention in the past years. In this study, solution-processed polymer PDs with a spectral response ranging from 350 nm to 2500 nm are reported. The low bandgap donor–acceptor (D–A) conjugated copolymer contributes to the IR photo-response. Implementation of a bulk heterojunction device structure with polypyrrole as an interfacial layer to match the energy level of the low bandgap D–A conjugated copolymer and the Ba/Al bi-cathode to compress dark current gave rise to a large photocurrent to dark current ratio, which resulted in detectivities greater than 10 11 Jones (1 Jones = 1 cm Hz 1/2 W −1 ) at wavelengths ranging from 350 nm to 2500 nm. Thus, our finding of utilization of bulk heterojunction composite consisting of a D–A low bandgap polymer blended with a fullerene derivative provides a facile way to detect IR radiation, indicating that broadband polymer PDs are promising for photoelectronic technology in the future.