EMAT Post-docs

Select Recent Publications

Spotlight: Si-CMOS compatible materials and devices for mid-IR microphotonics

Analysis of Threshold Current Behavior for Bulk and Quantum-Well Germanium Laser Structures

Single-Crystal Germanium Growth on Amorphous Silicon

Photonic crystal structures for light trapping in thin-film Si solar cells: Modeling, process and optimizations

Engineering broadband and anisotropic photoluminescence emission from rare earth doped tellurite thin film photonic crystals

Dr. Broderick

Lirong Zeng Broderick

Ph.D., Materials Science and Engineering, MIT, 2007
M.S., Materials Physics and Chemistry, University of Science and Technology, Beijing, 2001
B.S., Materials Physics, University of Science and Technology, Beijing, 1998

Lirong is a Postdoctoral Associate with the Microphotonics Center at MIT. The major focus of her research has been a constant quest for efficient harvest of solar energy at low cost, which can be summarized as Design for Higher Efficiency. Her research topics cover a wide spectrum from individual solar cells to system integration, including trapping light in thin film solar cells; using multiple junctions with differing bandgaps arranged in parallel on Si substrates with spectrum splitting and concentration; harvesting the full solar spectrum by the combination of photovoltaic and solar thermal effects in conjunction with PV waste heat utilization; and design for different climatic conditions and geographical locations for maximum energy output, via studying the effect of solar spectral variations and ambient temperature on solar collector performance.

She also has worked on light extraction enhancement in light emitting diodes through photonic design and new material implementation, and developing structural colors to replace certain organic pigments. Additionally she has experience on the design of resonant cavity enhanced multi-spectral infrared detector arrays, visible low level light detectors with arrayed architecture, and infrared low level light detectors at high operating temperature.

Lirong obtained her Ph.D. degree in Electronic, Photonic and Magnetic Materials from MIT in 2007, with her thesis entitled High Efficiency Thin Film Silicon Solar Cells with Novel Light Trapping: Principle, Design and Processing. She worked as a senior design engineer in Sensitron Semiconductor, Inc. for two years, and rejoined MIT in 2010 as a postdoctor. Prior to starting her Ph.D. program at MIT in 2001, she conducted research at Institute of Physics, Chinese Academy of Sciences under a joint program with University of Science and Technology, Beijing, for her M.S. thesis on enhancing magnetic exchange coupling in spin valve structures for high density magnetic recording. She conducted her bachelor's thesis research also at Chinese Academy of Sciences, studying the confining effect of nuclear track-etched pore on the growth of Fe nanowires.

Lirong pioneered the research on the development of a new light trapping scheme-textured photonic crystal that can improve thin film solar cell efficiency by more than 50%. Her innovative research on high efficiency solar cells was featured multiple times in various media: in the Oct. 5, 2006 issue of Nature Photonics Research Highlights; in 2008 by Science Daily, Nano Technology, Global Solar Technology, MIT News Office, and other media as a significant breakthrough to boost solar cell efficiency; her talk at the 2005 Spring Materials Research Society (MRS) meeting in San Francisco was reported as Meeting Highlight News. Her paper (Appl. Phys. Lett. 93, 221105 (2008)) was rated as one of the most downloaded during the past five years by Applied Physics Letters in August 2012. Her talk on full spectrum solar energy harvesting at the 2012 Fall MRS meeting in Boston was nominated for Best Paper Award.

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