Solution‐Processed AgSbS2 Thin Films for Photodetection

Abstract Ternary chalcogenide, silver antimony sulfide (AgSbS 2 ), has emerged with great potential for optoelectronic applications, thanks to its excellent optical properties, facile processability and superior stability. However, high‐performance AgSbS 2 ‐based photodiodes have not been realized mainly due to the large dark current caused by the poor morphology and device leakage. Here, compact AgSbS 2 and porous AgSbS 2 thin films are fabricated mainly via modulating the sol–gel processes of the precursors. After optimizing the Ag content and the thermal annealing temperature of the AgSbS 2 films, AgSbS 2 photodiodes with excellent performance metrics, including low dark current density, decent specific detectivity, and superior stability, are achieved. Furthermore, the optimized AgSbS 2 ‐based photodetectors are also introduced for heart rate detection, which exhibit excellent sensitivity and great potential for real applications.