Efficient noise suppression via controlling the optical cavity in near-infrared organic photoplethysmography sensors
- Authors
- Yang, Zhao; Kim, Byung Gi; Jang, Woongsik; Wang, Dong Hwan
- Issue Date
- Feb-2024
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.12, no.9, pp 3261 - 3271
- Pages
- 11
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 12
- Number
- 9
- Start Page
- 3261
- End Page
- 3271
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/72889
- DOI
- 10.1039/d3tc04489k
- ISSN
- 2050-7526
2050-7534
- Abstract
- Herein, a high-sensitivity organic photodetector (OPD) that operates in the near-infrared region is proposed by controlling the micro-cavity effects. This strategy implements an extension of reactive wavelength in an organic-semiconductor-based active layer. Comprehensive analyses, including atomic force microscopy and energy-dispersive X-ray spectroscopy, confirm the enhanced surface morphology of the active layer despite elongated optical and electrical pathways. Moreover, electrochemical characterisation reveals an increase in shunt resistance and a reduction in defect density owing to increased vertical pathways. These improvements directly contribute to dark current suppression in the OPD, reducing it from 2.36 x 10(-8) A cm(-2) under reference conditions to 7.07 x 10(-10) A cm(-2) under optimal conditions. Consequently, both signal quality and the measurable signal range are significantly enhanced. The optimal performance point is red shifted from 760 to 830 nm via a customised spectral response that is more suitable for photoplethysmography (PPG) applications. The performance at 830 nm is as high as 3.35 x 10(13) Jones. The PPG test proves the practical applicability of the proposed OPD, thus showcasing its potential in applications such as health monitoring and other relevant fields.
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Collections - College of ICT Engineering > School of Integrative Engineering > 1. Journal Articles
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