Ali Javey (Advisor)

Indium selenide is a promising 2D semiconductor that has garnered interest as a material for novel transistors. However, the optical properties of InSe and its potential as a platform for optoelectronic devices have not yet been fully explored. It is known that InSe has a direct bandgap near 1.25 eV2, and preliminary work on high-quality InSe grown by NIST has shown that it exhibits high quantum efficiency. Coupled with its previously shown high mobility, this suggests that it may be an excellent material for near infrared (NIR) sensing and emission for applications such as night...

We have been developing sweat sensors to analyze physiological and metabolic health information, such as sweat rate, glucose levels, pH, and various electrolytes, from any surface on the body surface where sweat glands are present. However, the stiff sweat sensors developed so far struggle to detect subtle signal changes, especially on soft skin. This is due to a mechanical mismatch between the rigid sweat sensor and the pliable skin, which can lead to motion artifacts and delamination of the patch from skin. Specifically, the stiff sensor cannot easily stretch along with the...

Core/shell quantum dots are known to have high photoluminescence quantum yield for their passivation through thicker shell by suppressing surface trap states. In spite of their excellent exciton dynamics, these bright quantum dots tend to suffer from stability issues and degradation over time. Here we investigate their photo-physical properties due to charge injection, which leads to unfavorable recombination pathways through charged excitons. This provides an additional tuning knob for modulation of their photoluminescence quantum yield after synthesis, thereby offering a means of...