Author:
Beh Khi Poay,Kamarulakmal Nurul Liyana,Rasiman Nabihah,Abdalrheem Raed,Umar Muttakka,Yam Fong Kwong,Lim Hwee San,Hassan Zainuriah
Abstract
Abstract
In this work, the characteristics of a chip-on-board screen printed GaN UV sensor was investigated. On the sensing element, GaN powders were obtained through ammonolysis of Ga2O3 at 1000°C under NH3 flow. The UV sensor platform was prepared using soft-lithography method, resulted in patterned circuit board. For the screen printing process, GaN powder is mixed with ethylcellulose/ethanol, subsequently deposited on the electrode pairs. The pure GaN sensor exhibited oscillations and change in amplitude upon UV sensing. This could be ascribed to high intrinsic resistance and parasitic capacitance and inductance. To mitigate this effect, rGO fillers were added and showed discern responds. Both sensors (with and without rGO) showed sensitiviy at 300 and 30% respectively, while the current magnitude for the latter was 54 times higher than that of former.
Subject
General Physics and Astronomy