Progress in flexible inorganic near-infrared photodetectors: materials and applications

Abstract

Mechanical flexibility and stretchability have become defining characteristics of next-generation electronics. As the core components for optical signal acquisition, infrared photodetectors are accordingly required to exhibit not only superior photodetection performance but also excellent mechanical compliance and durability. Recent advances have demonstrated promising pathways to transcend the limitations of conventional rigid devices through innovative material design and structural engineering. This review outlines key metrics for flexible inorganic infrared photodetectors, systematically summarizes advanced materials and their roles in core components (substrates, photoactive layers, and electrodes), and critically examines associated challenges. It concludes by discussing applications and future research directions, paving the way for technological advances in the field.