MOBEL

Semiconductors play an important role in our day to day life. The development in semiconductors technology has enabled management of our daily activities with a touch or a word from a person. The incredible power of semiconductor technology has been unravelled in the present situation during pandemic, where we were able to conduct our daily life without much interruption. This might not be possible without the fundamental and technological understanding of semiconductors since the development of semiconductor based devices from Bell Labs in 1953. Based on current challenges and aspirations of the humanity, more understanding about semiconductors, both in the fundamental and technological aspects is needed. Hence, there is a growing need to explore new materials, concepts, phenomena and more understanding of the physics and chemistry of semiconductors.

Silicon, being the most favoured semiconductor by the academic and industrial community, is difficult to replace. But the current status is due to last seven decades of efforts to understand the fundamentals and improvisation is foundry for developing high quality silicon for technological applications. But both academic and industry is in pursuit of alternatives due to its high energy processing techniques, limitation in extending to 3D electronics and toxicity involved in waste and processing chemicals. This has resulted in the development of new materials with elements in pure state and in combination with others like solution processable organic semiconductors and perovskite materials, quantum materials, 2D materials, etc. Miniaturization of electronic components to include more functionality in small space has resulted in many challenges as far as fundamental physics and chemistry of such systems is concerned. Different electrical and optical spectroscopic techniques, microscopy, transport studies and device physics which are used to understand the working mechanism of semiconductors need much more in-depth analysis and modifications to include phenomena involved on reduction in dimensionalities.

Our group focusses on solution processable semiconductors, understanding the physics and chemistry of such systems, designing of new devices/architectures, device physics and interface engineering. Our research work is primarily directed towards the photo induced free carrier generation, recombination and optoelectronic properties of devices made using organic, organic-inorganic hybrid, 2D, nano and quantum materials. We have been fabricating and understanding the photophysics of organic and perovskite solar cells, organic light emitting diodes, organic field effect transistors, and photodetectors. For understanding the device physics, we have been using various spectroscopic techniques like impedance spectroscopy, transient photovoltage and photocurrent spectroscopies and charge extraction by a linearly increasing voltage of photo-generated carriers (photo CELIV) technique.