Tunable Bi‐directional Broadband Self‐Powered Photoresponse in a 0D C ₆₀ /2‐D SnS ₂ Nanoflower Heterostructure

Abstract 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. Here, novel bidirectional photo response of 0‐D C ₆₀ /2‐D SnS ₂ nanoflower heterostructure for self‐powered broadband photodetector synthesis using sol–gel methods is presented. The photodetector exhibits significantly enhanced currents, with increases of ≈17000% (365 nm), 8750% (456 nm), 3333% (532 nm), 17647% (632 nm), and 124500% (850 nm) under zero bias, compared to C ₆₀ . Furthermore, 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 C ₆₀ /SnS ₂ , owing to the synergistic interplay between the photothermoelectric effect of C ₆₀ and the photovoltaic effect of SnS ₂ . Polarity switching bestows multifunctional attributes upon photoelectric devices, potentially providing innovative approaches to overcome conventional challenges and fulfill the demands of emergent technological paradigms.