Photodetectors (PDs) are the building block of various imaging and sensing applications. However, commercially available PDs based on crystalline inorganic semiconductors cannot meet the requirements of emerging wearable/implantable applications due to their rigidity and fragility, which creates the need for flexible devices. Here, we present a high-performance flexible PD by gating an organic electrochemical transistor (OECT) with a perovskite solar cell. Due to the ultrahigh transconductance of the OECT, the device demonstrates a high gain of ∼106, a fast response time of 67 μs and an ultrahigh detectivity of 6.7 × 1017 Jones to light signals under a low working voltage (≤ 0.6 V). Thanks to the ultrahigh sensitivity and fast response, the device can track photoplethysmogram signals and peripheral oxygen saturation under ambient light and even provide contactless remote sensing, offering a low-power and convenient way for continuous vital signs monitoring. This work offers a novel strategy for realizing high-performance flexible PDs that are promising for low-power, user-friendly and wearable optoelectronics.
|Original language||English (US)|
|State||Published - Nov 14 2022|
Bibliographical noteKAUST Repository Item: Exported on 2022-11-30
Acknowledged KAUST grant number(s): OSR-2019-CRG8-4086
Acknowledgements: This work is financially supported by the Research Grants Council (RGC) of Hong Kong, China (Project No. 15210319), the Innovation and Technology Commision of Hong Kong (Project No. MRP/040/18X), the Hong Kong Polytechnic University (Project No. ZE2X, CD46 and YW4Z)and Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices (GDSTC No. 2019B121205001). The authors acknowledge financial support from KAUST Office of Sponsored Research (OSR) award no. OSR-2019-CRG8-4086.We acknowledge funding from the European Union’s Horizon 2020 research and innovation program under grant agreement n. 952911, project BOOSTER and grant agreement n. 862474, project RoLA-FLEX, as well as EPSRC Project EP/T026219/1.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Mechanics of Materials
- Materials Science(all)
- Mechanical Engineering