Hemamala Indivari Karunadasa is an assistant professor of chemistry at
Stanford University.[1][2] She works on hybrid organic – inorganic materials, such as
perovskites, for clean energy and large area lighting.
Early life and education
Karunadasa grew up in
Colombo.[3] She attended high school in Sri Lanka and was a student at
Ladies' College, Colombo.[4] She thought that she would become a doctor, and eventually decided to apply to university in America.[3] She attended
Princeton University, where she worked with
Robert Cava on the geometric magnetic frustration of metal oxides.[5] Cava's excitement about research inspired Karunadasa to continue her own academic career.[3] Graduating with a degree in chemistry and a certificate in materials science and engineering, Karunadasa joined the
University of California, Berkeley for her doctoral studies. There she worked in the lab of
Jeffrey R. Long on heavy-atom building units for magnetic materials and electrocatalysts for
water splitting.[6] Karunadasa continued her work on water-splitting electrocatalysts with
Jeffrey R. Long and
Christopher Chang as a postdoctoral fellow. The molybdenum-oxo metal complex synthesized by Karunadasa is around seventy times cheaper than platinum, the most commonly used metal catalyst in water splitting.[4][6][7] She then moved to the
California Institute of Technology, where she worked on catalysts for
hydrocarbon oxidation with
Harry B. Gray as a BP Postdoctoral Fellow.[5]
Career
Karunadasa began her independent career at
Stanford University in 2012.[8] Her group synthesizes hybrid
perovskite materials that combine small organic molecules with inorganic solids. Three-dimensional lead iodide perovskites are being investigated for solar cells, but they can be both unstable and toxic. For example, their sensitivity to water makes them difficult materials to use in the fabrication of large-scale devices.[9] Karunadasa is interested in ways to mitigate these shortcomings, and any transient changes that may occur when these materials absorb light.[9] In particular, Karunadasa has created
two-dimensional perovskites, with thin inorganic sheets, that can be tuned to emit every colour of visible light.[10][11] In these systems the organic small molecules are sandwiched between the sheets.[10][12] In the case of thick inorganic sheets, the inorganic materials act as absorbers, and enhance the stability of the perovskite materials. The organo-metal-halide perovskites created by Karunadasa and her collaborator
Michael D. McGehee can be processed in solution.[13] She believes that through careful chemical design it is possible to determine the fate of photogenerated charge carriers. Karunadasa has investigated the lifetimes of acoustic phonons in lead iodide perovskites with Michael Toney and Aron Walsh.[14]