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Ultrathin Self-Powered Heavy-Metal-Free Cu-In-Se Quantum Dot Photodetectors for Wearable Health Monitoring

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Title
Ultrathin Self-Powered Heavy-Metal-Free Cu-In-Se Quantum Dot Photodetectors for Wearable Health Monitoring
Author(s)
Shi Li; Jae Hong Jang; Wookjin Chung; Hyojin Seung; Soo Ik Park; Hyeonjong Ma; Won Jun Pyo; Changsoon Choi; Dae Sung Chung; Dae-Hyeong Kim; Moon Kee Choi; Jiwoong Yang
Publication Date
2023-10
Journal
ACS Nano, v.17, no.20, pp.20013 - 20023
Publisher
American Chemical Society
Abstract
Mechanically deformable photodetectors (PDs) are key device components for wearable health monitoring systems based on photoplethysmography (PPG). Achieving high detectivity, fast response time, and an ultrathin form factor in the PD is highly needed for next-generation wearable PPG systems. Self-powered operation without a bulky power-supply unit is also beneficial for point-of-care application. Here, we propose ultrathin self-powered PDs using heavy-metal-free Cu-In-Se quantum dots (QDs), which enable high-performance wearable PPG systems. Although the light-absorbing QD layer is extremely thin (similar to 40 nm), the developed PD exhibits excellent performance (specific detectivity: 2.10 x 10(12) Jones, linear dynamic range: 102 dB, and spectral range: 250-1050 nm at zero bias), which is comparable to that of conventional rigid QD-PDs employing thick Pb-chalcogenide QD layers. This is attributed to material and device strategies-materials that include Cu-In-Se QDs, a MoS2-nanosheet-blended poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) hole transport layer, a ZnO nanoparticle electron transport layer, Ag and ITO electrodes, and an ultrathin form factor (similar to 120 nm except the electrodes) that enable excellent mechanical deformability. These allow the successful application of QD-PDs to a wearable system for real-time PPG monitoring, expanding their potential in the field of mobile bioelectronics.
URI
https://pr.ibs.re.kr/handle/8788114/14452
DOI
10.1021/acsnano.3c05178
ISSN
1936-0851
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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