Photomultiplication‐Type Organic Photodetectors for Near‐Infrared Sensing with High and Bias‐Independent Specific Detectivity. Issue 7 (7th January 2022)

• Record Type: Journal Article
• Authors: Xing, Shen; Kublitski, Jonas; Hänisch, Christian; Winkler, Louis Conrad; Li, Tian‐yi; Kleemann, Hans; Benduhn, Johannes; Leo, Karl
• Is Part Of: Advanced science. Volume 9:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-07
• Subjects: bias‐independent -- high detectivity -- near‐infrared sensing -- organic photodetectors -- photomultiplication; Science -- Periodicals; 505
• DOI: 10.1002/advs.202105113
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Highly responsive organic photodetectors allow a plethora of applications in fields like imaging, health, security monitoring, etc. Photomultiplication‐type organic photodetectors (PM‐OPDs) are a desirable option due to their internal amplification mechanism. However, for such devices, significant gain and low dark currents are often mutually excluded since large operation voltages often induce high shot noise. Here, a fully vacuum‐processed PM‐OPD is demonstrated using trap‐assisted electron injection in BDP‐OMe:C60 material system. By applying only −1 V, compared with the self‐powered working condition, the responsivity is increased by one order of magnitude, resulting in an outstanding specific detectivity of ≈10 13 Jones. Remarkably, the superior detectivity in the near‐infrared region is stable and almost voltage‐independent up to −10 V. Compared with two photovoltaic‐type photodetectors, these PM‐OPDs exhibit the great potential to be easily integrated with state‐of‐the‐art readout electronics in terms of their high responsivity, fast response speed, and bias‐independent specific detectivity. The employed vacuum fabrication process and the easy‐to‐adapt PM‐OPD concept enable seamless upscaling of production, paving the way to a commercially relevant photodetector technology. Abstract : A fully vacuum‐processed photomultiplication‐type organic photodetector for near‐infrared (NIR) sensing with high and bias‐independent specific detectivity is achieved by efficient trap‐assisted electron injection. More than 100% external quantum efficiency is exhibited at only −1 V. For the NIR light, an impressive specific detectivity ≈10 13 Jones can almost be voltage‐independent up to −10 V, indicating their potential in state‐of‐the‐art readout electronics.