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Hemamala Karunadasa

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Hemamala Karunadasa
Hemamala Karunadasa speaks at the Global Climate and Energy Project Symposium in 2014
Born
Hemamala Indivari Karunadasa
EducationLadies' College, Colombo
Alma materPrinceton University (AB)
University of California, Berkeley (PhD)
Scientific career
FieldsInorganic Chemistry
Materials Science[1]
InstitutionsStanford University
California Institute of Technology
University of California, Berkeley
ThesisHeavy atom building units for magnetic materials and molecular catalysts for generating hydrogen from water (2009)
Websiteweb.stanford.edu/group/karunadasalab

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 was an undergraduate student at Princeton University, where she majored in chemistry and materials science.[5] She was awarded a Certificate in Materials Science for her undergraduate project in 2003.[5] During her undergraduate degree, Karunadasa worked with Robert Cava on the geometric magnetic frustration of metal oxides.[5] His excitement about research inspired her to continue her own academic career.[3] Karunadasa joined the University of California, Berkeley for her doctoral studies, working in inorganic chemistry with Jeffrey R. Long. During her PhD research Karunadasa developed catalysts for water splitting as well as exploring heavy atom building blocks for magnetic molecules.[6] The molybdenum-oxo metal complex created by Karunadasa is around seventy times cheaper than platinum, the most commonly used metal catalyst in water splitting.[4][6][7]

Research and career

Karunadasa worked on electrocatalysts with Christopher Chang at the University of California, Berkeley.[5] She was a postdoctoral fellow with Harry B. Gray at the California Institute of Technology, where she worked on catalysts for hydrocarbon oxidation.[5]

She was appointed to the faculty at Stanford University in 2012.[8] Her group creates 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 for 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 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]

Awards and honours

Her awards and honours include;

Selected publications

Her publications include;

  • Smith, Ian C.; Hoke, Eric; Solis-Ibarra, Diego; McGehee, Michael; Karunadasa, Hemamala (2014-09-04). "A layered hybrid perovskite solar‐cell absorber with enhanced moisture stability". Angewandte Chemie International Edition. 53 (42): 11232–11235. doi:10.1002/anie.201406466. PMID 25196933.
  • Karunadasa, Hemamala; Montalvo, Elizabeth; Sun, Yujie; Majda, Marcin; Long, Jeffrey; Chang, Christopher (2012). "A molecular MoS2 edge site mimic for catalytic hydrogen generation". Science. 335 (6069): 698–702. Bibcode:2012Sci...335..698K. doi:10.1126/science.1215868. PMID 22323816. S2CID 7422855.
  • Hoke, Erik; Daniel, Slotcavage; Dohner, Emma; Bowring, Andrea; Karunadasa, Hemamala; McGehee, Michael (2015). "Reversible photo-induced trap formation in mixed-halide hybrid perovskites for photovoltaics". Chemical Science. 6 (1): 613–617. doi:10.1039/C4SC03141E. PMC 5491962. PMID 28706629.

Her work was featured in the Journal of the American Chemical Society Young Investigators Issue in 2019.[21] She serves on the editorial board of Inorganic Chemistry.

References

  1. ^ a b Hemamala Karunadasa publications indexed by Google Scholar Edit this at Wikidata
  2. ^ Hemamala Karunadasa publications from Europe PubMed Central
  3. ^ a b c University, Stanford (2019-08-19). "What it's like to be a chemist". Stanford News. Retrieved 2019-09-02.
  4. ^ a b "Reaching high with hydrogen". www.sundaytimes.lk. Retrieved 2019-09-02.
  5. ^ a b c d e f g h "Hemamala Karunadasa | Department of Chemistry". chemistry.stanford.edu. Retrieved 2019-09-02.
  6. ^ a b "Cool cat promises energy revolution | Laboratory News". www.labnews.co.uk. Retrieved 2019-09-02.
  7. ^ Chang, Christopher J.; Long, Jeffrey R.; Majda, Marcin; Sun, Yujie; Montalvo, Elizabeth; Karunadasa, Hemamala I. (2012). "A Molecular MoS2 Edge Site Mimic for Catalytic Hydrogen Generation". Science. 335 (6069): 698–702. Bibcode:2012Sci...335..698K. doi:10.1126/science.1215868. ISSN 0036-8075. PMID 22323816. S2CID 7422855.
  8. ^ University, Stanford (2019-08-19). "What it's like to be a chemist". Stanford News. Retrieved 2019-09-02.
  9. ^ a b "Resnick | Symposium". resnick.caltech.edu. Retrieved 2019-09-02.
  10. ^ a b "Speaker: Professor Hemamala Karunadasa | UCLA Chemistry and Biochemistry". www.chemistry.ucla.edu. Retrieved 2019-09-02.
  11. ^ Smith, Matthew D.; Connor, Bridget A.; Karunadasa, Hemamala I. (2019). "Tuning the Luminescence of Layered Halide Perovskites". Chemical Reviews. 119 (5): 3104–3139. doi:10.1021/acs.chemrev.8b00477. ISSN 0009-2665. OSTI 1528780. PMID 30689364.
  12. ^ Smith, Ian C.; Smith, Matthew D.; Jaffe, Adam; Lin, Yu; Karunadasa, Hemamala I. (2017-03-14). "Between the Sheets: Postsynthetic Transformations in Hybrid Perovskites". Chemistry of Materials. 29 (5): 1868–1884. doi:10.1021/acs.chemmater.6b05395. ISSN 0897-4756.
  13. ^ "GCEP Research » Blog Archive » Novel Inorganic-Organic Perovskites for Solution Processable Photovoltaics". Retrieved 2019-09-02.
  14. ^ Toney, Michael F.; Walsh, Aron; Karunadasa, Hemamala I.; Frost, Jarvist M.; Parshall, Dan; Smith, Ian C.; Skelton, Jonathan M.; Gehring, Peter M.; Gold-Parker, Aryeh (2018). "Acoustic phonon lifetimes limit thermal transport in methylammonium lead iodide". Proceedings of the National Academy of Sciences. 115 (47): 11905–11910. arXiv:1807.06679. Bibcode:2018PNAS..11511905G. doi:10.1073/pnas.1812227115. ISSN 0027-8424. PMC 6255186. PMID 30401737.
  15. ^ Karunadasa, Hemamala I.; Long, Jeffrey R. (2009). "Synthesis and Redox-Induced Structural Isomerization of the Pentagonal Bipyramidal Complexes [W(CN)5(CO)2]3− and [W(CN)5(CO)2]2−". Angewandte Chemie. 121 (4): 752–755. doi:10.1002/ange.200804199. ISSN 1521-3757.
  16. ^ "Catalyst Magazine V 1.1". Issuu. Retrieved 2019-09-02.
  17. ^ "Previous Winners - Thieme Chemistry - Georg Thieme Verlag". Thieme. Retrieved 2019-09-02.
  18. ^ "GCEPeople - GCEP". gcep.stanford.edu. Retrieved 2019-09-02.
  19. ^ "NSF Award Search: Award#1351538 - CAREER: Small-Molecule Capture and Ion Transport in Well-Defined Hybrid Materials". www.nsf.gov. Retrieved 2019-09-02.
  20. ^ "Hemamala Karunadasa Awarded 2015 Alfred P. Sloan Research Fellowship | Department of Chemistry". chemistry.stanford.edu. Retrieved 2019-09-02.
  21. ^ "JACS Young Investigators Virtual Issue 2019". pubs.acs.org. Retrieved 2019-09-02.
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