Abstract
Light-addressable potentiometric sensor (LAPS) is a kind of biochemical sensor based on semiconductor field effect addressed by light. In order to improve spatial resolution of chemical imaging system based on LAPS, metallic network is applied to suppress crosstalk. In this study, crack metallic network (CMN) is proposed to shrink electrode coverage and optimize photoelectric conversion efficiency. The crack pattern on colloidal film is used as template and crack metallic network is prepared on substrate surface by magnetron sputtering. LAPS with crack metallic network has a satisfactory sensor performance and a certain improvement of spatial resolution. Meanwhile, the coverage of crack metallic network remarkably reduces to 8.9 % and relative optical transmittance significantly increases to 90.95 %, corresponding to the photocurrent improvement. The results indicate crack metallic network effectively increases photocurrent magnitude under an acceptable spatial resolution.
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