Perovskite Solar Cell-Gated Organic Electrochemical Transistors for Flexible Photodetectors with Ultrahigh Sensitivity and Fast Response

Jiajun Song, Guanqi Tang, Jiupeng Cao, Hong Liu, Zeyu Zhao, Sophie Griggs, Anneng Yang, Naixiang Wang, Haiyang Cheng, Chun-Ki Liu, Iain McCulloch, Feng Yan

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Pages (from-to)2207763
JournalAdvanced Materials
StatePublished - Nov 14 2022
Externally publishedYes

Bibliographical note

KAUST 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


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