High Spatial Resolution 2D Photoelectrochemical Image Technology by Self-Assembly Quatum Dots (I)

In this project, a novel device structure and operation is proposed to improve the spatial resolution of chemical image and photocurrent intensity of light-addressable potentiometric sensor (LAPS). A quantum-dots (QD) layer is deposited on TiN/NbOx/a-Si/ITO glass substrate to restrict carrier transportation or diffusion. Several materials of quantum dots are planned to investigate including nano particle of TiO2, CdSe/ZnS and nano disk of TiO2, respectively. Spatial resolution of this developed device, named as LAQDS, could be improved to 5um for multi-ion sensing including pH, pK and pCl. This proposal will be worked out by 2 years with targets as listed below: 1st year: To have smaller spatial resolution, a-Si on glass is chosen as the substrate. TiN is selected to be the sensing membrane of LAPS and conductive electrode of photoelectrochemical (PEC) measurement. Plasma treatment and PVC membrane are used to for detection of potassium and chloride ions. TiO2 nano particle is used to enhance the photocurrent in PEC. 2nd year: TiO2 and CdSe/Zns nano particles are both investigated as quantum dots for the multi-ion sensing properties based on LAPS and LAQDS structure. In final, a nano-disk of TiO2 is designed and fabricated for better spatial resolution of LAQDS.

Project ID:PB10408-5742
External Project ID:MOST104-2221-E182-043