Ambient aqueous synthesis of aginse quantum dots for efficient white-light photodetectors

This study presents an aqueous-phase synthesis method conducted under ambient conditions to fabricate low-toxicity, water-soluble AgInSe (AISe) ternary quantum dots with excellent optical characteristics, catering to the increasing demand for high-performance white-light photodetectors. By adjusting key experimental parameters, the band structure and absorption spectrum of the AISe quantum dots were effectively tuned. The synthesized quantum dots exhibited a maximum photoluminescence emission peak at approximately 790.6 nm, with a full width at half maximum ranging from 90.78 to 185.7 nm. A white-light photodetector incorporating these quantum dots was successfully fabricated, demonstrating outstanding optoelectronic performance. The device achieved a high detectivity of 1.78 × 10 ¹ ⁰ Jones and a responsivity of 902 mA/W under a 5 V bias and 100 W/m² illumination. These findings underscore the promise of AISe quantum dots as a viable material for next-generation, low-toxicity, quantum-dot-based optoelectronic devices through precise control of their structural and optical properties.