| Citation: |
Sirsendu Ghosh, Gaurav Shukla, Ramesh Singh Bisht, Pramod Kumar. Thermo-optoelectronic synaptic device for heat and light-regulated neuromorphic applications and artificial sensory neuron system for humanoids[J]. Journal of Semiconductors, 2026, In Press. doi: 10.1088/1674-4926/26040010
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S Ghosh, G Shukla, R S Bisht, and P Kumar, Thermo-optoelectronic synaptic device for heat and light-regulated neuromorphic applications and artificial sensory neuron system for humanoids[J]. J. Semicond., 2026, accepted doi: 10.1088/1674-4926/26040010
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Thermo-optoelectronic synaptic device for heat and light-regulated neuromorphic applications and artificial sensory neuron system for humanoids
DOI: 10.1088/1674-4926/26040010
CSTR: 32376.14.1674-4926.26040010
More Information-
Abstract
Synaptic devices are required to break the Von Neumann bottleneck by incorporating memory and processing within the same physical location and hence improve the computational strength for artificial intelligence and the Internet of Things (IoT). In this article, we report the synaptic characteristics of a two-terminal device, where an organic semiconductor (OSC) N, N'–dioctyl–3,4,9,10–perylenedicarboximide (PTCDI–C8) is sandwiched between Indium tin oxide (ITO) and gold (Au) on a Silicon/Silicon–dioxide (Si/SiO2) substrate, under multi-stimulus activation. The synaptic device utilizes a tungsten lamp that emits a broad spectral range from Ultraviolet (UV) to Infrared (IR) as a pre-synaptic signal, while providing a change in current as a post-synaptic signal. We demonstrate the short-term plasticity (STP) and long-term plasticity (LTP) based on exposure time. Electron-hole pairs are generated in OSC when UV–visible light is absorbed from external stimulation, which triggers the output current, whereas the IR component introduces a thermally assisted contribution that further enhances charge transport. Hence, the effect of temperature is also observed, which simultaneously acts as an external stimulation for the synaptic device. Under temperature accompanied by optical stimulation, the learning-forgetting-relearning phenomenon is also achieved in this work. Additionally, logic operation and associative learning phenomena are demonstrated by the device under IR and tungsten source. The change in current depends on the exposure time and the temperature generated on the surface. Since temperatures above 45 °C are hazardous to human beings, this synaptic device is useful in measuring and retaining this information. The incorporation of temperature with light is not commonly used as an external synaptic stimulus in the same device, hence it can find its applications in neuromorphic computing and artificial sensory neuron systems, which is also capable of sensing and retaining thermal information. -
References
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Proportional views



Sirsendu Ghosh received his B.Sc. and M.Sc. degrees in Physics from the University of Calcutta, India, in 2018 and 2020, respectively. He is currently a doctoral student at the Indian Institute of Technology Bombay, India. His research interests include simulation and experimental studies of organic semiconductor-based devices, particularly field-effect transistors, resistive switching, neuromorphic computing, and emerging memory technologies.
Gaurav Shukla received his B.Sc. and M.Sc. degrees from the University of Allahabad, India, and earned his Ph.D. in Physics from the DST-Centre for Nano and Soft Matter Sciences, Bangalore, in 2022. He subsequently held postdoctoral positions at the Indian Institute of Technology Bombay and the Nanoscience Institute–CNR, Pisa, Italy, before joining the National Quantum Mission of India in 2025. His research focuses on nanofabrication, quantum and superconducting devices, neuromorphic systems, surface engineering, structural colors, and plasmonic nanostructures, bridging materials science, condensed matter physics, and device engineering.
Pramod Kumar is a professor and doctoral advisor at the Department of Physics, Indian Institute of Technology Bombay. He received his PhD from Jawaharlal Nehru University, New Delhi, India. He later held postdoc positions at the Israel Institute of Technology, Haifa, Israel and the Biorobotics Institute, Pontedera, Scuola Superiore Sant'Anna, Pisa, Italy. His primary research interests focus on the application of organic semiconductors, the interface between organic and inorganic semiconductors, charge carrier transport in disordered systems, field effect transistors, sensors and artificial intelligence integration with sensors and devices.
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