Room‐Temperature‐Operated Ultrasensitive Broadband Photodetectors by Perovskite Incorporated with Conjugated Polymer and Single‐Wall Carbon Nanotubes |
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Authors: | Wenzhan Xu Yikun Guo Xiaotao Zhang Luyao Zheng Tao Zhu Dahui Zhao Wenping Hu Xiong Gong |
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Affiliation: | 1. College of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, USA;2. Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, P. R. China;3. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, School of Science, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, P. R. China |
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Abstract: | In this work, room‐temperature‐operated ultrasensitive solution‐processed perovskite photodetectors (PDs) with near infrared (NIR) photoresponse are reported. In order to enable perovskite PDs possessing extended NIR photoresponse, novel n‐type low bandgap conjugated polymer, poly(N,N′‐bis(2‐octyldodecyl)‐1,4,5,8‐naphthalene diimide‐2,6‐diyl) (2,5‐dioctyl‐3,6‐di(thiophen‐2‐yl)pyrrolo3,4‐c]pyrrole‐1,4‐dione‐5,5′‐diyl)] (NDI‐DPP), which has strong absorption in the NIR region, is developed and then employed in perovskite PDs. By the formation of type II band alignment between NDI‐DPP with single‐wall carbon nanotubes (SWCNTs), the NIR absorption of NDI‐DPP is exploited, which contributes to the NIR photoresponse for the perovskite PDs, where perovskite is incorporated with NDI‐DPP and SWCNTs as well. In addition, SWCNTs incorporated with perovskite active layer can offer the percolation pathways for high charge‐carrier mobility, which tremendously boosts the charge transfer in the photoactive layer, and consequently improves the photocurrent in the visible region. As a result, the perovskite PDs exhibit the responsivities of ≈400 and ≈150 mA W?1 and the detectivities of over 6 × 1012 Jones (1 Jones = 1 cm Hz1/2 W?1) and over 2 × 1012 Jones in the visible and NIR regions, respectively. This work reports the development of perovskite PDs with NIR photoresponse, which is terrifically beneficial for the practical applications of perovskite PDs. |
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Keywords: | broadband spectral response n‐type low‐bandgap conjugated polymers perovskite photodetectors single‐wall carbon nanotubes |
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