Shinde, Akash Sandesh and Badhulika, Sushmee
(2018)
2D materials based Nanoelectronic devices for multifunctional sensors.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
Conventional electronic devices deal with rigidity and hence lack of flexibility and stretchablity. A research that is rapidly evolving to develop human friendly flexible and stretchable devices for future electronics. A lot of research has been done on fabricating sensors and electronic devices using 2D materials having characteristics like stretchablity, bendability. These nanomaterials can be used for fabrication of photodetectors, temperature, pressure and strain sensors because of their excellent electronic, thermal, mechanical and optical properties.
The second chapter deals with the demonstration of human integrated electronic devices such as RC filters by utilizing flexible capacitor fabricated using few layer MoS2 grown on Al foil via hydrothermal method as electrodes and cellulose paper as a dielectric material. Advantage of using MoS2 on Al foil is the enhanced capacitance upon strain due to the piezoelectric property of few layered MoS2 over monolayer MoS2. Upon application of external strain on capacitor the mathematical operations such as differentiation and integration are observed for different input signal using RC filter circuits. Such a simple technique for fabrication of flexible variable capacitor is a major step ahead in wearable electronics having applications in digital electronics and sensors.
The 2-D nanomaterials possesses great optical properties so can be used for photo detection. The second chapter deals with 2D ZnO/Gr pyro-phototronic diode. Even though 2D ZnO has been utilized for enhanced self-powered sensing by strain modulation due to its piezoelectric property, study on utilizing pyroelectric property of ZnO remains unexplored. For pyroelectric nan generator, temperature difference can be triggered by external light source which does not disrupt the ZnO structure and also avoids the need for physical bending/pressing as in case of piezoelectric nanogenerator. This work represents the first demonstration of fabrication of flexible 2D ZnO/Gr pyro-phototronic diode where the pyro potential generated in the 2D ZnO due to the NIR illumination adds/subtract with the built-in electric field of the heterojunction and modulates the depletion region of the heterojunction thereby enabling bias free operation.
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