University of California, Riverside

Department of Electrical and Computer Engineering



Emergence of Quantum Dots and Organometal Halide Perovskites in Thin Film Photovoltaics Presented by: Dr. Prashant V. Kamat


Emergence of Quantum Dots and Organometal Halide Perovskites in Thin Film Photovoltaics....
 
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Emergence of Quantum Dots and Organometal Halide Perovskites in Thin Film Photovoltaics Presented by: Dr. Prashant V. Kamat

May 19, 2014 - 11:10 am
Winston Chung Hall, 205/206

Abstract

Assembling semiconductor nanostructures on electrode surfaces in a controlled fashion is an attractive approach for designing next generation solar cells. In recent years, quantum dot solar cells (QDSC) and Organometal Halide Perovskites have emerged as the potential contenders for making transformative changes. By assembling different size CdSe quantum dots on mesoscopic TiO2 films either by direct adsorption or with the aid of molecular linkers we have designed quantum dot solar cells.  Upon bandgap excitation, CdSe quantum dots inject electrons into TiO2 thus enabling the generation of photocurrent in a photoelectrochemical solar cell.  Compared to the electron injection rate, the hole transfer rate across the semiconductor interface remains a bottleneck in achieving photoconversion efficiency greater than 6%. Composition controlled tuning of bandgap has enabled us to design tandem layers of CdSeS QDs of varying bandgap within the photoactive anode of Quantum Dot Solar Cell (QDSC). Organometal halide perovskites have now emerged as new and promising candidates for developing low cost thin film solar cells. Recent advances that led to the development of high efficiency perovskite solar cells will be described.

Biography

Prashant V. Kamat is a Rev. John A. Zahm, C.S.C., Professor of Science in the Department of Chemistry and Biochemistry and Radiation Laboratory at University of Notre Dame. He is also a Concurrent Professor in the Department of Chemical and Biomolecular Engineering.  He earned his doctoral degree (1979) in Physical Chemistry from the Bombay University, and postdoctoral research at Boston University (1979-1981) and University of Texas at Austin (1981-1983).  He joined Notre Dame in 1983. Professor Kamat has for nearly three decades worked to build bridges between physical chemistry and material science to develop advanced nanomaterials that promise cleaner and more efficient light energy conversion.

Professor Kamat’s research has made significant contributions to four areas: (1) Photoinduced catalytic processes using semiconductor and metal nanoparticles, nanostructures and nanocomposites, (2) Development of light energy harvesting assemblies (e.g., quantum dots and inorganic-organic hybrid assemblies) for next generation solar cells, (3) Utilization of carbon nanostructures (SWCNT and graphene) as conducting scaffolds to collect and transport charge carriers in solar cells and fuel cells, and (4) Environmental remediation using advanced oxidation processes and chemical sensors.

He has directed DOE funded solar photochemistry research for the past 30 years.  In addition to large multidisciplinary interdepartmental and research center programs, he has actively worked with industry-sponsored research. He has served on many national panels on nanotechnology and energy conversion processes.  He has published more than 400 scientific papers that have been well received by the scientific community (35000+ citations).

He is currently serving as the deputy editor of the Journal of Physical Chemistry Letters. He is a member of the advisory board of several scientific journals (Langmuir, Research on Chemical Intermediates, Journal of Colloid & Interface Science, and Applied Electrochemistry).  He was awarded Honda-Fujishima Lectureship award by the Japanese Photochemical Society in 2006, CRSI medal by the Chemical Research Society of India in 2011 and Langmuir lectureship award in 2013. He is a Fellow of the Electrochemical Society (ECS), American Chemical Society (ACS) and American Academy of Science (AAAS).

 

 

 

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University of California, Riverside
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Electrical and Computer Engineering
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University of California, Riverside
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