Thomas J. Kempa

Assistant Professor

New Chemistry Building, Room 111
Curriculum Vitae
Group/Lab Website
Google Scholar Profile


Tom Kempa received his B. S. degree in Chemistry from Boston College in 2004. Subsequently, a Marshall Scholarship brought him to the U.K. where he spent 2 years at Imperial College London studying the photophysics of organic semiconductors for light emitting diodes and solar cells. He arrived at Harvard University in the fall of 2006 and began his Ph. D. studies with Prof. Charles Lieber in whose lab he led the discovery and development of nanoscale materials for next-generation solar cells and photonic devices. He joined Prof. Daniel Nocera's lab as a post-doctoral fellow in the summer of 2012 and uncovered electrochemical and hydrodynamic phenomena, which can be harnessed to form complex and regular patterns of inorganic nanostructures. He is the recipient of the MRS Graduate Student Award, the Dudley Herschbach Teaching Award, the Fieser Award Lecture, and, most recently, the 2013 IUPAC Young Chemist Prize. In July 2015, Tom joined the faculty of the Department of Chemistry at Johns Hopkins as an Assistant Professor.

The Kempa Group is interested in synthesizing solid-state materials whose exciting and exotic properties can help address extant challenges in environmental sustainability and in human health. We develop diverse synthetic methods to make solid-state structures and devices embodying new phases, architectures, and topologies. Since these materials can exert unique control over critical physical processes (e.g. mass, charge, and energy transport), we use them to study un-answered questions in basic science and to define advances in solar cells, catalysts, thermoelectrics, self-assembly, optics, electronics, and biological imaging.

Our current research efforts include:

(1) Synthesis of 2D materials and superlattices composed of perovskites and transition metal oxides for the transport, conversion, and storage of energy.

(2) Development of new strategies for non-equilibrium assembly of sophisticated ordered networks for optical and electronic applications.

(3) Preparation of multi-component inorganic nanoprobes for in situ interrogation and stimulation of electrogenic cells and neural networks.

Our research is highly interdisciplinary in method and concept. Methodologically speaking, we use and develop a rich toolset of solid-state, electrochemical, and inorganic synthetic methods for materials and device preparation. Conceptually speaking, we explore and attempt to address fundamental challenges in energy, optics, self-assembly, and the life sciences.

Lab members will gain exposure to and expertise in gas-phase and electrochemical synthesis techniques, numerous electronic and structural characterization methods, nano-device fabrication, photonics, spectroscopy, and energy research.

030.403 "Optoelectronic Materials and Devices" (Fall 2015 and 2016)

Displaying the 20 most recent publications. View the Google Scholar Profile for complete publications list.

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CM Lemon, E Karnas, X Han, OT Bruns, TJ Kempa, D Fukumura, ...
Micelle-Encapsulated Quantum Dot-Porphyrin Assemblies as in Vivo Two-Photon Oxygen Sensors
Journal of the American Chemical Society 137 (31), 9832-9842, 2015

TJ Kempa, DK Bediako, SK Kim, HG Park, DG Nocera
High-throughput patterning of photonic structures with tunable periodicity
Proceedings of the National Academy of Sciences 112 (17), 5309-5313, 2015

TJ Kempa, DK Bediako, EC Jones, CM Lieber, DG Nocera
Facile, Rapid, and Large-Area Periodic Patterning of Semiconductor Substrates with Submicron Inorganic Structures
Journal of the American Chemical Society 137 (11), 3739-3742, 2015

KD Song, TJ Kempa, HG Park, SK Kim
Laterally assembled nanowires for ultrathin broadband solar absorbers
Optics express 22 (103), A992-A1000, 2014

SK Kim, KD Song, TJ Kempa, RW Day, CM Lieber, HG Park
Design of nanowire optical cavities as efficient photon absorbers
ACS nano 8 (4), 3707-3714, 2014

TJ Kempa, CM Lieber
Semiconductor nanowire solar cells: synthetic advances and tunable properties
Pure and Applied Chemistry 86 (1), 13-26, 2014

TJ Kempa, SK Kim, RW Day, HG Park, DG Nocera, CM Lieber
Facet-selective growth on nanowires yields multi-component nanostructures and photonic devices
Journal of the American Chemical Society 135 (49), 18354-18357, 2013

TJ Kempa, RW Day, SK Kim, HG Park, CM Lieber
Semiconductor nanowires: a platform for exploring limits and concepts for nano-enabled solar cells
Energy & Environmental Science 6 (3), 719-733, 2013

SK Kim, RW Day, JF Cahoon, TJ Kempa, KD Song, HG Park, CM Lieber
Tuning light absorption in core/shell silicon nanowire photovoltaic devices through morphological design
Nano letters 12 (9), 4971-4976, 2012

TJ Kempa, JF Cahoon, SK Kim, RW Day, DC Bell, HG Park, CM Lieber
Coaxial multishell nanowires with high-quality electronic interfaces and tunable optical cavities for ultrathin photovoltaics
Proceedings of the National Academy of Sciences 109 (5), 1407-1412, 2012

B Tian, P Xie, TJ Kempa, DC Bell, CM Lieber
Single-crystalline kinked semiconductor nanowire superstructures
Nature nanotechnology 4 (12), 824-829, 2009

Y Dong, B Tian, TJ Kempa, CM Lieber
Coaxial group III− nitride nanowire photovoltaics
Nano letters 9 (5), 2183-2187, 2009

B Tian, TJ Kempa, CM Lieber
Single nanowire photovoltaics
Chemical Society Reviews 38 (1), 16-24, 2009

TJ Kempa, B Tian, DR Kim, J Hu, X Zheng, CM Lieber
Single and tandem axial pin nanowire photovoltaic devices
Nano letters 8 (10), 3456-3460, 2008

B Tian, X Zheng, TJ Kempa, Y Fang, N Yu, G Yu, J Huang, CM Lieber
Coaxial silicon nanowires as solar cells and nanoelectronic power sources
Nature 449 (7164), 885-889, 2007

T Kempa, RA Farrer, M Giersig, JT Fourkas
Photochemical synthesis and multiphoton luminescence of monodisperse silver nanocrystals
Plasmonics 1 (1), 45-51, 2006

T Kempa, D Carnahan, M Olek, M Correa, M Giersig, M Cross, G Benham, ...
Dielectric media based on isolated metallic nanostructures
Journal of applied physics 98 (3), 034310, 2005

Y Wang, K Kempa, B Kimball, JB Carlson, G Benham, WZ Li, T Kempa, ...
Receiving and transmitting light-like radio waves: Antenna effect in arrays of aligned carbon nanotubes
Applied physics letters 85 (13), 2607-2609, 2004