Shubhra Pasayat
University of Wisconsin-Madison, WI·Engineering·Early-career
Ultraviolet (UV) light is used to sanitize water, air and surfaces, treat skin disease and store food. Most UV sources are still mercury lamps.
- Fields
Engineering
Materials Science
Physics
- Topics
ultraviolet LEDs
UV light-emitting diodes
III-nitride semiconductors
- Grants
- 1 known grant, through Jun 2029
What they work on
- Develop porous semiconductor substrates that are mechanically flexible and reflective, to relieve strain in III-nitride ultraviolet LED layers and redefine their critical thickness limits.
- Improve external quantum efficiency of UV LEDs emitting at 280–365 nm using new quantum wells, thin light-producing layers, and new carrier injection layers.
- Build mechanical, optical and electrical computational models to guide experiments and explain the physics of the porous-substrate device structures.
More about the research
UV light-emitting diodes (LEDs) could replace them, but their efficiency drops sharply in parts of the UV range. This project aims to raise that efficiency by up to ten times.
Why it matters
More efficient UV LEDs could replace mercury lamps for water, air and surface sanitization, food storage and farming, and medical uses such as skin disease treatment and surgery. They could also save energy and improve security systems used for ID cards and banks.
Known grants
From NIH and NSF research grants. Labs often have other funding we can't see.
Closest labs
Kexin Li
Arizona State University Campus Immersion, AZ·Engineering
Develop a cryogenic compact model for gallium nitride high-electron-mobility transistors (HEMTs) by extending an existing quasi-ballistic model. Capture how electron transport, self-heating and charge trapping change as temperature drops.
Spyridon Pavlidis
North Carolina State University, NC·Engineering·Early-career
Extract impact ionization coefficients — the parameters governing avalanche breakdown — from avalanche photodiodes fabricated on native aluminum nitride substrates, to establish how large an electric field aluminum-rich AlGaN can support.
Michael McGehee
University of Colorado Boulder, CO·Materials Science
Synthesize all-inorganic triple-halide perovskites with band gaps of 1.9–2.1 eV and map which compositions mix into a single stable phase, using X-ray diffraction and composition analysis.
The school
University of Wisconsin-Madison: 91 labs on PI Pages, $1.9B a year on research, 854 research doctorates a year.
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