Organic photodetector with built-in amplification for the detection of visible light with low optical power

• Published in: Organic electronics Vol. 90; p. 106064
• Main Authors: Jia, Xiaojia, Fuentes-Hernandez, Canek, Chou, Wen-Fang, Kippelen, Bernard
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 01.03.2021; Elsevier
• Subjects: Amplification; Low optical power; Organic photodetectors; Organic photodiodes; Organic thin-film transistors; OTHER INSTRUMENTATION; Amplification; Organic photodiodes; Low optical power; Organic photodetectors; Organic thin-film transistors
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2021.106064

We report on an organic-based photodetector that integrates a dual-gate organic thin-film transistor (DG-OTFT) with an organic photodiode (OPD) to produce a device with a high effective responsivity at low optical power and video-rate compatible response. In this device, the OPD operates in photovoltaic mode, instead of the commonly used photoconductive mode, to modulate one of the gate voltages of the DG-OTFT. Effective responsivity values of 10 A W−1 are measured at optical power values lower than 10 nW at 635 nm. Modeling of the operation of this new photodetector suggests that effective responsivity values up to 105 A W−1 can be achieved at optical powers of 1 nW using current printing technology and state-of-the-art organic semiconductors. [Display omitted] •Organic photodetector with a dual-gate organic thin-film transistor with an organic photodiode yielding high responsivity.•Achieved effective responsivity of 10 A W−1 at 10 nW at 635 nm and a response time less than 15 ms.•MModeling suggests that effective responsivity values up to 105 A W−1 could be reached.