The domain of my research is Plasma Physics and Allied area. The plasma induced surface modification of materials can lead to introduction of modification of physical properties like electrical resistivity, thermal properties, structural modification, etc. Our work is focused on electron beam irradiation and plasma induced modification of perovskite manganites. Perovskites are compounds of structure ABX3, where A is the rare-earth cation, B is the divalent cation and X is an anion. Perovskite manganites have the general formula of ABMnO3. Perovskite manganites show interesting properties like colossal magnetoresistance (CMR), metal-insulator transition temperature (TMI), and ferromagnetic to paramagnetic transition (FM-PM) at a certain temperature. The properties of perovskites can be modified by changing their structure in a controlled manner by doping or electron beam and plasma irradiation. Because of such important properties it has wide range of applications from solar cells, Solid state memory devices, magnetic cooling, etc.
Another area of work in material science is in Fabrication and characterization silicon nanowire solar cells. The challenge in solar cells research is to increase the efficiency of solar cells. In this work, AgNPs were deposited on both sides of the p-type Si wafer by an electroless deposition method. The particle size of AgNPs was in the range of 55-100 nm with the average particle size varying from 57.32 to 80 nm. Vertical SiNWs have been synthesized by electroless metal assisted chemical etching process by taking Ag nanoparticles as catalyst. SiNWs hybrid solar cell has been prepared by using (PEDOT׃PSS) PP and rGO-PP as the hole transport layer. All different types of characterizations like XRD, SEM, EDAX, Cyclic Voltametry, I-V measurement, etc were done.
Our team is also involved in the investigation of instabilities in Quantum semiconductor plasma. In quantum plasma, quantum effects cannot be ignored. It is the case for degenerate plasmas, in which the temperature is very smaller than the Fermi energy. There are different types of instabilities like streaming instability, parametric instability, modulational instabilities, beam driven instabilities, etc. The study of such instabilities is important from the point of view of development of Quantum Devices.
Another major area of work is the investigation of the heating of the solar corona. Experimental observations have showed that the temperature of the solar coronal region is much higher than that of the solar core. The heating mechanism of the solar corona has remained as one of the burning areas for the Astroplasma physicists. The current understanding of the coronal heating problem has taken two different approaches: reconnection and wave heating mechanism. Even though it is conjectured that turbulence is the main phenomena of dumping the energy from the core at the corona but there is not yet complete understanding of this phenomena. The coronal eccentric heating is still an unresolved problem and very limited work is done on the field with the compressibility taken into consideration, therefore the study of the wave modes formation in compressible region of the corona will be studied which may lead to the heating of the coronal surface of the sun via turbulence mechanism.
Deka, Utpal Dr., "Material processing and theoretical Quantum plasma and Solar plasma" (2022). Basic Science Collection. 6.