Self-powered infrared detection, polarization sensing, and visual synaptic behavior in a multifunctional MoS2/Ta2NiS5 heterojunction

Two-dimensional heterojunctions offer a wide range of applications in the field of optoelectronic devices due to their unique energy band structure and interface effects. Despite this, challenges still persist in miniaturization, integration, and achieving high-performance applications for optoelectronic devices. To address these challenges, the optimal strategy may involve developing new devices capable of simultaneously achieving multifunctionality. In this study, we have constructed a MoS₂/Ta₂NiS₅ heterojunction to realize multifunctional applications, integrating self-powered infrared detection, polarization sensing, and visual synaptic behavior. The heterojunction exhibits an on/off ratio of 1.1 × 10⁴, a responsivity of 3.1 mA W⁻¹, a detectivity of 3.24 × 10¹⁰ Jones, and a photoelectric conversion efficiency of 0.42% in detecting 808 nm light. Notably, its detection performance is more superior in the visible wavelength band. Moreover, the heterojunction demonstrates a high anisotropic ratio of 3.89 in detecting the polarization of 1064 nm light. Furthermore, the heterojunction achieves excellent optoelectronic synaptic performance under 1550 nm light, with low power consumption of 5.07 pJ at 0.1 V bias. These results demonstrate that the heterojunction not only realizes high-performance applications in multiple fields but also opens up new possibilities for the development of multifunctional optoelectronic devices in the future.