@article{8f1caac9ed91421d99a8ac6328221608,
title = "Perovskite Solar Cell-Gated Organic Electrochemical Transistors for Flexible Photodetectors with Ultrahigh Sensitivity and Fast Response",
abstract = "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, a high-performance flexible PD is presented 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.",
keywords = "contactless sensing, flexible photodetectors, organic electrochemical transistors, perovskite solar cells, wearable electronics",
author = "Jiajun Song and Guanqi Tang and Jiupeng Cao and Hong Liu and Zeyu Zhao and Sophie Griggs and Anneng Yang and Naixiang Wang and Haiyang Cheng and Liu, {Chun Ki} and Iain McCulloch and Feng Yan",
note = "Funding Information: This work was financially supported by the Research Grants Council (RGC) of Hong Kong, China (Project No. 15210319), the Innovation and Technology Commission 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. The authors 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. Funding Information: This work was financially supported by the Research Grants Council (RGC) of Hong Kong, China (Project No. 15210319), the Innovation and Technology Commission 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. The authors 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. Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
month = nov,
day = "14",
doi = "10.1002/adma.202207763",
language = "English",
volume = "35",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley-Blackwell",
number = "6",
}