Publication date: 15th December 2025
Colloidal quantum dots (CQDs) are solution-processed semiconductor nanocrystals that exhibit size-tunable optical and electronic properties due to strong quantum confinement effects. Their ability to be synthesised with precise control over composition, structure, and surface chemistry has enabled the creation of high-performance optoelectronic devices. In the NIR range, they are being investigated for a wide variety of infrared applications, such as light detection and ranging (LiDAR), telecommunications, quantum technologies, photodetectors, cameras, biosensors, deep tissue imaging and therapy. In this study, a microelectronics-based method is employed for the selective deposition of nanomaterials with micrometric resolution. This method relies on UV-patternable composites incorporating Ag2S nanocrystals, where photolithography compatible with the electronics industry is used to create the patterns. The Ag2S nanocrystals were synthesized through a coprecipitation method, and their morphology and optical characteristics were subsequently analyzed. An optimal formulation for the lithographic with different types of masks to achieve a wide range of patterns. process was then developed. Finally, the micro-luminescence of the resulting patterns was evaluated using a confocal microscope coupled to an FLS1000 spectrofluorometer from Edinburgh Instruments.
The authors thank the Project TSI-069100-2023-0012, funded by the Secretaría de Estado de Telecomunicaciones e Infraestructuras Digitales. JMH thanks the Spanish AEI and MCIU for support through the grants BG22/00128 (program Beatriz Galindo) and PID2023-151632OB-C21.
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