"Welcome to The Prashant Kamat lab at the University of Notre Dame! With the help of internal and external collaborations we have established a successful multidisciplinary research program in nanostructure architectures and energy conversion processes." - Prashant Kamat


Kamat Lab News


Friday, December 19, 2014Posted by Jeff Christians

Elkhart Memorial High School

Elkhart Memorial High School Students test solar cells at Notre Dame

We recently assisted 12 chemistry students from Elkhart Memorial High School, and their teacher Brenda Mueller, in a lab experiment on Dye-Sensitized Solar Cells. Brenda had participated in the summer RET program at Notre Dame where she learned about solar cells, and then brought that knowhow back to her students at EMHS. Jeff, Joe, and Danilo taught them about solar cells, tested devices that they had made in their lab, and gave them a tour of our laboratories - we even got to eat some Papa John's! Thanks to all the students for making it a fun visit!

Picture Album

Friday, December 19, 2014Posted by Jeff Christians

KamatLab 2014 Annual Report

Size-Dependent Photovoltaic Performance of CuInS2 Quantum Dots Sensitized Solar Cells

2014 has been another very successful year in the Kamat Lab thanks to all of the hardworking graduate students, postdocs, visiting scientists, undergraduates, and collaborators! Two members of the group received PhDs, Sachi Krishnamurthy in Chem. and James Radich in CBE, and we welcomed two new graduate students to the group, Christian Telavera in Chem. and Sebastian Snowberger in CBE. In addition, we welcomed postdoc Chris Tuinenga to the group. As a group, we were able to publish 28 research articles - setting a new record for the group! - in many different high-impact journals since our last Annual Report. Many of our graduate students, undergraduates, and postdocs were also recipients of numerous fellowships and awards, and presented their research at international conferences. It has been an exciting year of research and we look forward to a productive and fun 2015! Best wishes for the New Year!

Annual Report

Friday, December 19, 2014Posted by Jeff Christians

Yong-Siou Chen - Eilers Fellowship

Graduate Student Yong-Siou Chen wins Eilers Fellowship

Congratulations to Yong-Siou Chen who was recently awarded the 2015 Patrick and Jana Eilers Graduate Student Fellowship for Energy Related Research awarded by ND Energy. Yong-Siou received this prestigious award in order to continue his cutting-edge research on perovskite solar cells. He is currently a 4th year graduate student in the department of chemistry and the author of 5 publications as a member of the Kamat Lab, including 2 first author papers in JACS. Join us in congratulating Yong-Siou on this well-deserved recognition of his outstanding work!

Wednesday, November 12, 2014Posted by Jeff Christians

Size-Dependent Photovoltaic Performance of CuInS2

Read the latest paper from the Kamat Lab!

Size-Dependent Photovoltaic Performance of CuInS2 Quantum Dots Sensitized Solar Cells

Size-Dependent Photovoltaic Performance of CuInS2 Quantum Dots Sensitized Solar Cells

Abstract: The optical and electronic properties of quantum dots (QDs) which are drastically affected by their size have major impact on their performance in devices like solar cells. We now report the size dependent solar cell performance for CuInS2 QDs capped with 1-dodecanethiol. Pyramidal shaped CuInS2 QDs with diameter between 2.9 nm and 5.3 nm have been synthesized and assembled on mesoscopic TiO2 films by electrophoretic deposition. Time resolved emission and transient absorption spectroscopy measurements have ascertained the role of internal and surface defects in determining the solar cell performance. An increase in power conversion efficiency (PCE) was observed with increasing size of QDs, with maximum values of 2.14 and 2.51% for 3.9 and 4.3 nm size particles, respectively. The drop in PCE observed for larger QDs (5.3 nm) is attributed to decreased charge separation following bandgap excitation. Since the origin of photocurrent generation in CuInS2 QDSC arises from the defect dominated charge carriers it offers the opportunity to further improve the efficiency by controlling these defect concentrations.

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Monday, November 3, 2014Posted by Jeff Christians

Dual Nature of CH3NH3PbI3 Excited State

Read the latest paper from the Kamat Lab!

Dual Nature of the Excited State in Organic-Inorganic Lead Halide Perovskites

Dual Nature of the Excited State in Organic-Inorganic Lead Halide Perovskites

Abstract: The rapid increase in efficiency of methylammonium lead halide perovskite solar cells necessitates further investigation into the nature of perovskite absorption features and optical properties. Films obtained from the deposition of solutions containing lead halides and the CH3NH3+ organic cation is known to yield the CH3NH3PbI3 perovskite structure upon annealing. In examining the precursor solution used in the processing of CH3NH3PbI3 solar cells, we find that Pb2+ readily forms plumbate complexes in the presence of excess iodide ions and exhibits characteristic absorption bands at 370 (PbI3-) and 425 nm (PbI42-). Through comparative spectral analysis of the absorption features of charge transfer complexes in the solution phase and the final solid-state perovskite films, we are able to fully classify the absorption features in the excited state of CH3NH3PbI3 across the transient absorption spectrum recorded following laser pulse excitation. In particular, we attribute the broad photoinduced absorption to a charge-transfer excited state, and show correlation between the photoinduced absorption and 480 nm bleach signals. These observations lead us to propose a band structure composed of two distinct transitions that is consistent with the various spectral features and kinetic behavior of the CH3NH3PbI3 excited state. Characterization of this unique dual excited state nature provides further insight into the optoelectronic behavior of hybrid lead halide perovskite films and thus aids in elucidating their exceptional photovoltaic properties.

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