About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Solid-State Optical Materials and Luminescence Properties
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| Presentation Title |
Self-powered Visible Light Detection using Silver and Cesium Antimony Iodide Thin Films Synthesized by Rapid Iodization Techniques |
| Author(s) |
Varshika Puthan Veedu Sasidharan, Sadasivan Shaji, David Avellaneda Avellaneda, Manuel García Méndez, Bindu Krishnan |
| On-Site Speaker (Planned) |
Varshika Puthan Veedu Sasidharan |
| Abstract Scope |
In this work, we report the development of lead-free silver and cesium antimony iodide thin films for self-powered visible light detection, synthesized via rapid iodization. Rudorffite-phase AgSb₂I₇ thin films were fabricated by thermal iodization of sequentially deposited Sb₂S₃ and Ag layers, resulting in phase-pure cubic structures with crystallite sizes exceeding 100 nm. Morphological studies revealed rod-like features. Concurrently, Cs₃Sb₂I₉ thin films with hexagonal structure (P6₃/mmc) were synthesized by rapid iodization of Sb₂S₃–CsCl precursors prepared by spin coating. The optical band gaps were 2.0–2.2 eV for AgSb₂I₇ and ~1.8–1.96 eV for Cs₃Sb₂I₉, confirming strong visible light absorption. Both materials demonstrated self-powered photoconductive behavior without external bias, with AgSb₂I₇-based photodiodes (FTO/n-CdS/i-AgSb₂I₇/p-CuI) achieving a responsivity of 2.29 mA/W and an external quantum efficiency of 70% under 525 nm illumination. Cs₃Sb₂I₉ devices exhibited good stability, validating their potential for durable, no-power-consumption optoelectronics. This study highlights rapid iodization as a route to efficient, sustainable photodetectors. |