Dr Varun Kumar Singh

Fabrication and Characterization of thin-film based semiconducting devices.
Device physics and operation of BJT, MOS transistors, Amplifiers, current sources, Op-Amps, Feedback circuits, comparators.
Analog and Digital circuit design, CMOS technologies, Logic Synthesis, Timing Analysis, ASIC/FPGA Design, Power optimization, Semiconductor Memories.

Fabrication and characterization of silicon and flexible PET-based photosensors, gas sensors, biosensors etc.
Organic Electronics, Synthesis of Nanocomposites, Self-Assembled Materials, Transparent Flexible Transistors, Organic/Inorganic Thin Films based Structures and Devices, Metal Oxide based structures, Photosensors, 2D Materials, Electronic Sensors, Biosensors, Nanostructures, Device and Circuit Simulation, Characterization of Thin Films and Nanoparticles.
Hands-on experience with a variety of thin-film deposition techniques i.e., Physical vapor deposition (thermal evaporation, sputtering, and electron beam evaporation) and Solution-processed methods (spin coating, dip coating, drop casting, spray pyrolysis, Langmuir Blodgett, and floating film transfer method), enabling me to fabricate diverse electronic devices with precision and efficiency.
Application and interpretation of structural, optical, and electrical relationships in single and composite materials using various complementary tools: SEM, TEM, AFM, XRD, UV-Vis-NIR Spectroscopy, Spectrophotometer, etc.
Analog and Digital circuit design, CMOS technologies, Logic Synthesis, Timing Analysis, ASIC/FPGA Design, Power optimization, Semiconductor Memories.

V. K. Singh, A. Verma, P. Kumar and V. N. Mishra, "Solution-Processed, Highly-Efficient Organic Field-Effect Transistor Based Hydrogen Sulfide Gas Sensor at Sub-ppm Regime," in IEEE Sensors Journal, vol. 23, no. 15, pp. 16600-16607, 1 Aug.1, 2023, doi: 10.1109/JSEN.2023.3288932.
V. K. Singh and V. N. Mishra, "Solution Processed Highly Efficient H2S Gas Sensor with Sub-ppb Detection Limit Based on Self-Aligned Thin Film of PCPDTBT Decorated with CdS Nanoparticles," in IEEE Transactions on Electron Devices, vol. 70, no. 8, pp. 4351-4358, Aug. 2023, doi: 10.1109/TED.2023.3287509.
V. K. Singh and V. N. Mishra, “HfLaOx High-k Dielectric based, Fully Solution Processed OFET HS Gas Sensor at sub-ppm Regime, Using Photoirradiated-SVA annealed PCPDTBT/MoS2 nanocomposite Thin film”, doi: 10.1109/JSEN.2023.3312334
A. Verma, P. Kumar, V. K. Singh, V.N. Mishra, R. Prakash, “Introduction of graphene oxide nanosheets in self-oriented air-stable poly(3-hexylthiophene-2,5-diyl) to enhance the ammonia gas sensing of a p-channel thin film transistor”, Sensors and Actuators B: Chemical, Volume 385, 2023, 133661, ISSN 0925-4005, https://doi.org/10.1016/j.snb.2023.133661.
A. Verma, V. K. Singh and V. N. Mishra, "A Low-Voltage Operated Organic TFT-Based Inverter with Solution-Processed LiZnOx Dielectric," in IEEE Transactions on Electron Devices, vol. 70, no. 9, pp. 4815-4821, Sept. 2023, doi: 10.1109/TED.2023.3297557.