Bozhi Tian1
University of Chicago1
Biointerface devices can facilitate a deeper understanding of biological dynamics and improve the quality of life. My research group integrates nanoscience with biophysics and bioengineering to study semiconductor-based biointerfaces. We have previously identified and quantified the photothermal, photofaradic, and photocapacitive effects of nanostructured semiconductors, which can be used to modulate electrical activities in neurons and cardiomyocytes at the semiconductor-based biointerfaces.<br/><br/>In this talk, I will describe two heterojunction platforms that have recently been developed in our lab for photostimulation of cells and tissues. A heterojunction plays a crucial role in semiconductor-based devices such as diodes, solar cells, photodetectors, and light-emitting diodes. Compared with homojunction semiconductor devices, heterojunction devices can produce minority carriers (for example, through light illumination) that can be used in critical applications such as energy harvesting. There are, however, still several opportunities for the future development of semiconductor-based heterojunctions in biointerface studies. One of our heterojunctions uses porosity-based silicon structures, while the other uses titania/gold multilayered membranes. I will illustrate the photostimulation mechanisms in cells and tissues for both heterojunctions. Finally, I will present future biointerface developments in our lab.