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Tunable Multiband Halide Perovskite Tandem Photodetectors with Switchable Response
Oliver D I Moseley1, Bart Roose2,1, Szymon J Zelewski1,3
1Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
ACS Photonics
|December 27, 2022
Summary
Researchers developed a novel perovskite solar cell photodetector capable of four spectral bands. This device enables fast, optically controlled switching for advanced imaging and secure optical communications.
Area of Science:
- Materials Science
- Optoelectronics
- Photonics
Background:
- Multiband photodetectors are crucial for enhancing imaging and communication systems by enabling the detection of various photon energies.
- Existing multiband photodetector technologies are limited to two spectral bands and lack rapid in situ switching capabilities.
Purpose of the Study:
- To demonstrate a novel all-perovskite tandem solar cell device concept for multiband photodetection.
- To achieve fast, optically controlled switching between four distinct spectral response bands from a single device.
- To explore applications in optical communications, including secure encryption.
Main Methods:
- Exploited the band gap tunability of all-perovskite tandem solar cells.
- Engineered a single multijunction device to achieve four spectral response bands.
- Utilized optical bias light for switching between narrowband and broadband responses.
Main Results:
- Demonstrated a single multijunction device with four switchable spectral response bands.
- Achieved highly selective, narrowband monochromatic light response without external filters.
- Exhibited sensitive photodetection (> 6 × 10^11 Jones) with rapid switching times (< 250 ns).
- Showcased optically controlled switching between response bands using bias light.
Conclusions:
- The developed all-perovskite tandem solar cell photodetector offers a versatile platform for multiband detection.
- Fast, optically controlled switching capabilities open new avenues for advanced optical communication systems.
- The device's tunable response enables potential applications in secure data transmission and encryption.
