Sensitive and Ultrafast Perovskite/Organic Hybrid Photodetectors With a Broad Spectral Response From Ultraviolet to the Telecommunication Band

• DOI: 10.1002/smll.202502657
• Publication Date: 2025-05-27T13:43:57Z
• Authors: Yifan Hu; Ting Ji; Haibo Zhang; Zurong Ma; Jianxun Tao; Wenyan Wang; Jiaqi Ma; Linlin Shi; Guohui Li; Yanxia Cui
• Keywords: Ultraviolet; Broad band

Abstract Fast and sensitive photodetectors (PDs) with broadband spectral responses are crucial in numerous fields, including image sensing, optical communication, biochemical applications. While organic PDs offer responses, their response speed is typically limited to the microsecond range. This study demonstrates a sensitive, ultrafast PD broad by combining 2D perovskite layer an heterojunction of poly[(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b;4,5‐b′] dithiophene‐2,6‐diyl‐alt‐(4‐(2‐ethylhexyl)‐3‐fluorothieno[3,4‐b]thiophene‐)‐2‐carboxylate‐2‐6‐diyl)] (PTB7‐Th) (2,20‐((2Z,20Z)‐((12,13‐bis(2‐ethylhexyl)‐3,9‐diundecyl‐12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,30′:4′,50]thieno[20,30:4,5]pyrrolo[3,2‐g]thieno[20,30: 4,5]thieno[3,2‐b]indole‐2,10‐diyl)bis(me‐thanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dima‐lononitrile) (Y6) as active layer. The enhances sensitivity across wide range due better absorption at short wavelengths improves hole mobility. external quantum efficiency achieves 85% 335 nm 72% 830 under −2 V bias. At nm, responsivity detectivity reach 0.5 A W −1 2.8 × 10 12 Jones, respectively. large linear dynamic 197 dB observed 375 nm. Additionally, time significantly reduced 2.6 ns decreasing RC constant. hybrid also extending up 1550 attributed intermolecular charge transfer between PTB7‐Th Y6. work advances development low‐cost, broadband, high‐speed for