1. Inorganic vacancy-ordered perovskite Cs2SnCl6:Bi/GaN heterojunction photodiode for narrowband, visible-blind UV detection.
- Author
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Shao, Dali, Zhu, Weiguang, Xin, Guoqing, Lian, Jie, and Sawyer, Shayla
- Subjects
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HETEROJUNCTIONS , *PHOTODETECTORS , *CESIUM compounds , *WAVELENGTHS , *NANOPARTICLES , *LIGHTING , *INDIUM gallium nitride - Abstract
A heterojunction photodiode was fabricated from Bi doped Cs2SnCl6 nanoparticles (Cs2SnCl6:Bi NPs) spin-coated on an epitaxially grown GaN substrate. With the back illumination configuration, the heterojunction photodiode demonstrated excellent narrow-band UV sensing capability with a full wavelength of half maximum of 18 nm and a maximum detectivity of 1.2 × 1012 jones, which is promising for biomedical applications. In addition to the excellent narrow band UV sensitivity, the device also demonstrated a large linear dynamic range of 71 decibels (dB) and a fast photoresponse speed (a rise time of 0.75 μs and a fall time of 0.91 μs). The excellent performance is attributed to excellent carrier separation efficiency at the heterojunction interface and improved carrier collection efficiency through the multi-walled carbon nanotube (MWCNT) network. All the above advantages are of great importance for commercial deployment of perovskite-based photodetectors. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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