Advisor: Professor Sahika Inal

Abstract:
Organic photoelectrochemical transistor (OPECT) is an electrochemical transistor in which the output current is controlled by light. OPECTs show increased transconductance upon light exposure, thus enhancing the sensitivity and signal-to-noise ratio when the transistor is used as a biosensor. However, to make an organic electrochemical transistor photosensitive, it is necessary to integrate photoactive materials into the device, which often requires the use of additional metals, sophisticated nanostructures, and complex synthetic approaches. Moreover, current OPECT devices are only responsive to the visible region, and their use in the near-infrared range has not been investigated yet. This thesis explores the possibility of building an OPECT by use of a single photoactive material that acts both as the photoactive gate and the channel material to simplify OPECT design. We screen photoelectrochemical properties of water-compatible, n-type soft semiconducting polymers and their performance in OPECT architectures with potential applications at the biological interface. Moreover, we explore another organic material and device architecture to render OPECTs suitable for near-infrared (NIR) detection.

Bio:
Master student in Bioengineering program at Organic Bioelectronics Lab.