Marina S. Leite
Assistant Professor
Materials Science and Engineering
Institute for Research in Electronics and Applied Physics
Thursday, November 5, 2015, 2:00 pm
800 22nd Street NW, SEH B1220
Washington, DC 20052
Hosted by: Dr. Santiago Solares ([email protected])
Our group at UMD utilizes scanning and electron microscopy based methods to understand physical and chemical phenomena in materials for energy that take place at the nanoscale. In the first part of the talk, I will focus on our projects in photovoltaics, including multijunction solar cells and polycrystalline thin-films. I will show how we image the functionality of photovoltaic devices using nanospectroscopy by scanning probe microscopies [1-3]. In particular, we apply illuminated-Kelvin probe force microscopy to quantify and spatially resolve the open-circuit voltage (Voc) of solar cells with spatial resolution <100 nm. On the real of Li-ion all-solid-state batteries, we by combine real-time scanning electron microscopy in ultra-high vacuum with electrochemical cycling to quantify the dynamic degradation of anodes [4,5].
Refs:
[1] E. M. Tennyson, J. L. Garrett, C. Gong, J. A. Frantz, J. D. Myers, R. Y. Bekele, J. S. Sanghera, J. N. Munday, M.S. Leite. “Nanoimaging of Open-Circuit Voltage in Photovoltaic Devices”. Adv. Energy Materials (2015). To appear on the Front Cover.
[2] E. M. Tennyson, M. S. Leite. “Mapping the performance of solar cells with nanoscale resolution”. SPIE Newsroom, 2015. DOI: 10.1117/2.1201509.006097.
[3] M.S. Leite, M. Abashin, H. J. Lezec, A. Gianfrancesco, A. A. Talin, and N. B. Zhitenev. “Nanoscale Imaging of Photocurrent and Efficiency in CdTe Solar Cells”. ACS Nano, 8, 11883 (2014).
[4] M.S. Leite, D. Ruzmetov, Z. Li, L. Bendersky, A. Kolmakov, N. Bartelt, and A. Alec Talin. “Insights From In-Situ Electron Microscopy into Capacity Loss Mechanisms in Li-Ion Batteries with Al Anodes”. J. Chem Materials A, 2, 20552 (2014). Inside Cover.
[5] C. Gong, D. Ruzmetov, A. Pearse, D. Ma, J. N. Munday, G. Rubloff, A. A. Talin, and M.S. Leite. “Surface/Interface Effects on High-Performance Thin-Film All-Solid-State Li-Ion Batteries”. ACS Appl. Materials and Interf., in press (2015). DOI: 10.1021/acsami.5b07058.
Leite is an Assistant Professor in Materials Science and Engineering, and the Institute for Research in Electronics and Applied Physics. Her group is engaged in fundamental and applied research related to materials for energy applications, exploring these materials from their nano-scale structural, electrical, and optical properties to their implementation in devices. Before joining UMD, Leite worked for two years at NIST and was a post-doctoral scholar at Caltech. She received her PhD in physics from Campinas State University in Brazil and the Synchrotron Light Source Laboratory. In 2014, Leite received the MD Academy of Science Young Outstanding Scientist Award.