Stable, self-biased Cs2AgBiBr6 thin-film based photodetector by three-step vapor-deposition
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Authors
Biswas, Iman
Dey, Arka
Dalal, Avijit
Saha, Subrata
Nunzi, Jean-Michel
Mondal, Aniruddha
Date
2023-11-29
Type
journal article
Language
en
Keyword
Alternative Title
Abstract
A lead-free, pure phase double perovskite Cs2AgBiBr6 thin film (TF) is fabricated on an ITO glass plate through a three-step sequential vacuum thermal evaporation method followed by annealing. X-ray diffraction (XRD) analysis of the synthesized material revealed a cubic phase with a lattice constant of α = 11.26 Å. The TF exhibits UV and visible absorption with a bandgap estimated at 2.31 eV (303 K) and a red shift of 0.04 eV (363 K). The optical absorption spectrum is simulated using the modified band anti-crossing (BAC) model, determining the Cs2AgBiBr6 TF's theoretical relative refractive index (r.i.) as 2.10 (303 K) and 1.90 (363 K). Furthermore, a photodetector based on Ag/Cs2AgBiBr6/ITO/glass architecture was fabricated, showcasing excellent stability and self-powered photodetection properties under continuous illumination across a wide temperature range of 303–373 K. The device demonstrates a fast temporal response (13/9 ms), a responsivity of ∼1.0 × 10−4 A/W, and a detectivity of ∼2.5 × 107 Jones. Light sensitivity measurements reveal that the device is twice as sensitive at 373 K compared to room temperature, with negligible (1%) degradation in light sensitivity after 60 days of storage under normal ambient conditions.
Description
The final publication is available at Elsevier via https://doi.org/10.1016/j.jallcom.2023.172903 © 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Citation
Biswas, I.; Dey, A.; Dalal, A.; Saha, S.; Nunzi, J.-M.; Mondal, A. Stable, Self-Biased Cs2AgBiBr6 Thin-Film Based Photodetector by Three-Step Vapor-Deposition. Journal of alloys and compounds 2024, 976, 172903-. https://doi.org/10.1016/j.jallcom.2023.172903.
Publisher
Journal of Alloys and Compounds