Role of Doping Ratio on The Sensing Properties of ZnO:SnO2 Thin Films

TL;DR

This study investigates how varying the doping ratio of SnO2 in ZnO:SnO2 thin films affects their gas sensing performance, revealing optimal sensitivity at 9% doping and 200°C operation.

Contribution

It demonstrates the enhancement of gas sensing sensitivity in ZnO:SnO2 films with specific doping ratios, highlighting the optimal doping level for improved NO2 detection.

Findings

Maximum sensitivity at 9% doping ratio

Enhanced sensitivity compared to undoped films

Optimal operating temperature of 200°C

Abstract

Thin films of ZnO:SnO2 were deposited on different substrates like glass and c-Si using spray pyrolysis method .The structures and morphology of the prepared samples films were cheeked using X-ray diffraction and atomic force microscope. Gas sensing measurements provided from resistance measurement in the absent and exposure to NO2 gas . The results showed that good enhancement of sensitivity take place after doping with tin oxide. Maximum sensitivity obtained at 9% doping ratio and operating temperature 200oC.