MCUT Research

Small/ 2025, vol. 21, 2411859

Tunable Bi-directional Broadband Self-Powered Photoresponse in a 0D C60/2-D SnS₂ Nanoflower Heterostructure

Main authors: Mahesh Kumar, Sheng-Chi Chen, Adhimoorthy Saravanan, Bohr-Ran Huang/MCUT/ MCUT/NTUST/NTUST

A low-dimensional hybrid heterostructure was fabricated by integrating buckyball fullerene (C₆₀) onto SnS₂ nanoflowers, enhancing broadband photoresponse. This unique hybrid heterostructure enables a self-powered bidirectional photodetector with a wavelength-dependent polarity switch, attributed to the synergistic interplay between the photothermoelectric effect of fullerene C₆₀ and the photovoltaic effect of SnS₂ nanoflowers. (論文連結)

Here, novel bidirectional photo response of 0-D C₆₀/2-D SnS₂ nanoflower heterostructure for self-powered broadband photodetector synthesis using sol–gel methods is presented. By adjusting the wavelength of the incident light, controllable bidirectional photoresponse (negative for wavelength = 365 nm and positive for 456–850 nm wavelengths) is achieved through the C₆₀/SnS₂, owing to the synergistic interplay between the photothermoelectric effect of C₆₀ and the photovoltaic effect of SnS₂. Realizing bidirectional photodetection is essential for developing next-generation artificial neuromorphic systems, visual information processing, and future optoelectronic logic gates.

Photodetectors are promising visible light communication systems due to their energy efficiency and cost-effectiveness. Color shift keying is frequently used in visible light communication to meet non-negative light intensity modulation demands. However, requiring a minimum of two photodetectors with filters to decode optical signals raises the device cost and complicates the communication system. Polarity switching bestows multifunctional attributes upon photoelectric devices, potentially providing innovative approaches to overcome conventional challenges and fulfill the demands of emergent technological paradigms.