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Prashant V. Kamat

Karnatak University, India,
B.S. ('72)
Bombay University, India,
M.S. ('74) Ph.D. ('79)

Tel. (574) 631-5411
e-mail: Kamat.1@nd.edu

Charge Transfer Processes and Energy Conversion



Scientific Interests

To develop fundamental understanding of energy harvesting and charge transfer processes in light harvesting assemblies with an objective to elucidate mechanistic and kinetic details and improve light energy conversion efficiencies.design of hybrid assemblies

Quantum Dot Solar Cells - Excited state dynamics and surface chemistry of semiconductor quantum dots, designing semiconductor heterostructures for efficient charge separation and elucidation of photoelectrochemical mechanism.

Photocatalysis - Interfacial charge transfer at semiconductor and metal interface, role of metal nanoparticles as cocatalysts in hotocatalysis and design of hybrid assemblies for light energy conversion.

Nanocarbon Chemistry - Electron storage and transport properties of graphene oxide and carbon nanotube based assemblies, design of multifunctional catalyst mat to improve selectivity and efficiency of photocatalytic processes.

Electrochemistry at Mesoscale
- Nanostructure architectures for batteries, fuel cells, and solar cells, evaluation of electrocatalytic processes and CO2 reduction.


Recent Accomplishments | Top |

One of the possibilities to engineer the light harvesting features over a broader region and utilize the photons more effectively is to develop a tandem structure of semiconductor QDs such that the absorption of photons within the film is carried out in a systematic and gradient fashion. The photoactive anode prepared by depositing 4.5 nm CdSe quantum dots within the mesoscopic film of TiO2 exhibited an increased power conversion efficiency of 3.2 - 3.0 % in a two- and three-layered tandem QDSC as compared to 1.97% -2.81% with single-layered CdSeS.

Electron and energy transfer rates from photoexcited CdSe colloidal quantum dots (QDs) to graphene oxide (GO) and reduced graphene oxide (RGO) were isolated by analysis of excited state deactivation lifetimes as a function of degree of oxidation and charging in GO (Figure 2). Apparent rate constants for energy and electron transfer determined for CdSe-graphene oxide composites were 5.5 x 108 s-1 and 6.7 x 108 s-1, respectively.  Additionally, incorporation of graphene oxide in colloidal CdSe QD films deposited on conducting glass electrodes was found to enhance the charge separation and electron conduction through the QD film, thus allowing three-dimensional sensitization.

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Selected Publications | Top |

Santra, P. and Kamat, P. V.
Tandem Layered Quantum Dot Solar Cells. Tuning the Photovoltaic Response with Luminescent Ternary Cadmium Chalcogenides.
J. Am. Chem. Soc.
, 2013,  135, 877–885. Link

Kamat, P. V.
Manipulation of Charge Transfer Across Semiconductor Interface. A Criterion that Cannot be Ignored in Photocatalyst Design
J.Phys. Chem. Lett
., 2012,  3, 663-672.Link

Kamat, P. V.
Boosting the Efficiency of Quantum Dot Sensitized Solar Cells Through Modulation of Interfacial Charge Transfer
Acc. Chem. Res.
, 2012,  45, 1906–1915.Link

Choi, H., Santra, P. K. and Kamat, P. V.
Synchronized Energy and Electron Transfer Processes in Covalently Linked CdSe-Squaraine Dye-TiO2 Light Harvesting Assembly
ACS Nano
, 2012,  6, 5718–5726.Link

Lightcap, I. V.and Kamat, P. V.
Fortification of CdSe Quantum Dots with Graphene Oxide. Excited State Interactions and Light Energy Conversion
J. Am. Chem. Soc
., 2012,  134, 7109–7116. Link

Lightcap, I. V., Murphy, S., Schumer, T.and Kamat, P. V.
Electron Hopping Through Single-to-Few Layer Graphene Oxide Films. Photocatalytically Activated  Metal Nanoparticle Deposition
J. Phys. Chem. Lett
., 2012,  3, 1453-1458. Link

See complete list of publications

 

Supported by the Division of
Chemical Sciences
Office of
Basic Energy Sciences
at the
U.S. Department of Energy

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Last Modified: 02/07/2013

 

       





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