Abstract
Remote measurement of vital sign parameters like heartbeat and respiration rate represents a compelling challenge in monitoring an individual’s health in a noninvasive way. This could be achieved by large field-of-view, easy-to-integrate unobtrusive sensors, such as large-area thin-film photodiodes. At long distances, however, discriminating weak light signals from background disturbance demands superior near-infrared (NIR) sensitivity and optical noise tolerance. Here, we report an inherently narrowband solution–processed, thin-film photodiode with ultrahigh and controllable NIR responsivity based on a tandem-like perovskite-organic architecture. The device has low dark currents (<10 −6 mA cm −2), linear dynamic range >150 dB, and operational stability over time (>8 hours). With a narrowband quantum efficiency that can exceed 200% at 850 nm and intrinsic filtering of other wavelengths to limit optical noise, the device exhibits higher tolerance to background light than optically filtered silicon-based sensors. We demonstrate its potential in remote monitoring by measuring the heart rate and respiration rate from distances up to 130 cm in reflection.
Original language | English |
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Article number | eadf9861 |
Number of pages | 10 |
Journal | Science Advances |
Volume | 9 |
Issue number | 7 |
DOIs | |
Publication status | Published - 17 Feb 2023 |
Keywords
- Perovskite
- Organics
- Photodiodes
- Smart health
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This ‘Harry Potter’ light sensor achieves magically high efficiency of 200 per cent
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3 items of Media coverage
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