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Abstract: Energy efficient solid state electronic devices that are made of clean and non-hazardous materials are essential. The seminar will revolve around this central theme: energy efficient devices, clean semiconductors and energy harvesting. Research on efficient light emitters using the abundant and exciting III-Nitride materials will be presented. Although we can increase efficiency of electronics using novel paradigms of operation, we cannot completely eliminate losses. While heat is dissipated in all activities leading to loss of useful resources, we can also recover the lost energy by scavenging the heat and transforming it to useful electricity. This type of harvesters employ the Seebeck effect to generate electricity. Recent work on the Silicon based engineered thermoelectric material will be presented as well. The engineered material has the potential to find widespread applications for waste heat recovery, especially in smart windows and wearable electronics, to supply low-power devices. Bio-Sketch: Dr. Debashree Banerjee obtained her PhD under the IITB-Monash Research Academy, working at IIT Bombay and Monash University. She was engaged in Silicon-based thermoelectric generator research at Uppsala University, Sweden during 2015 – 2017. Recently she has received INSPIRE Faculty Award from DST and joined at CSIR-CEERI for the execution of her research plans. She has authored or co-authored more than 25 journal articles and conference contributions.