Flexible circularly polarized light detection enabled by supramolecular chiral assembly within bulk heterojunctions

Abstract

The development of flexible circularly polarized light (CPL) photodetectors is fundamentally challenged by the simultaneous requirement for strong chiroptical activity and efficient charge transport under mechanical deformation. Here, we report a supramolecular chiral induction combined with confined capillary‐bridge assembly to address this issue. Achiral PCDTPT is rendered optically active via non‐covalent interactions with chiral additives, achieving a high dissymmetry factor ( g ph, max  = 0.4 at 850 nm) and broadband chiroptical activity of 300–1100 nm. The confined assembly not only stabilizes the induced helical order but also enables the formation of periodic bulk heterojunction arrays on flexible substrates. The resulting devices exhibit a low dark current (5.01 × 10 −9  A cm −2 ), high detectivity (2.18 × 10 12 Jones) and fast response (4.47 ms). The flexible polarized imaging chip exhibits robust mechanical durability, as demonstrated by its stable imaging under 30% strain. This work provides a versatile platform for flexible CPL detection and wearable polarization sensing.