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Weak‑Light Self‑Powered UV–Blue Photodetection via Cs₂AgBiBr₆/SnS₂ Heterojunction | ||
| Challenges in Nano and Micro Scale Science and Technology | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 15 شهریور 1405 اصل مقاله (989.63 K) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22111/cnmst.2026.55536.1307 | ||
| نویسنده | ||
| Rafat Rafiei Rad* | ||
| Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| چکیده | ||
| Lead-free double perovskite Cs₂AgBiBr₆ has emerged as a promising candidate for environmentally friendly optoelectronic devices. However, its application in self-powered photodetectors, especially under weak light conditions, remains challenging. In this work, we propose and numerically investigate a heterojunction structure consisting of ITO/SnS₂/Cs₂AgBiBr₆/Ni for weak-light UV–blue photodetection. The device operates at zero bias and shows improved performance compared to conventional SnO₂-based and Au-based structures. Compared to the reference, the SnS₂ ETL significantly enhances the photoresponse in the near-UV region (300–340 nm), improving responsivity by up to 77% at 300 nm. The proposed structure exhibits an external quantum efficiency (EQE) of 41.4% at 350 nm and 47.1% at 440 nm under 100 mW/cm² illumination, corresponding to responsivities of 0.117 A/W and 0.167 A/W, respectively. The specific detectivity (D*) reaches 1.90 × 10⁹ Jones at 350 nm for the reference devices, while the SnS₂/Ni device achieves 2.39 × 10¹⁰ Jones, a 15‑fold improvement. The device maintains stable performance down to 0.001 mW/cm², with a limit of detection (LOD) of 2.88 × 10⁻⁶ mW/cm². The superior performance makes it suitable for biomedical imaging, secure optical communications, and UV early warning systems. These results indicate that the Cs₂AgBiBr₆/SnS₂/Ni heterojunction is a highly efficient and stable self-powered photodetector for the UV–blue spectral range, particularly suitable for low-light environments. | ||
| کلیدواژهها | ||
| Cs₂AgBiBr₆؛ Heterojunction؛ Self-powered photodetector؛ SnS₂؛ UV–blue detection | ||
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آمار تعداد مشاهده مقاله: 3 تعداد دریافت فایل اصل مقاله: 3 |
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