首页|Formation and dissociation of excitons in La3+-doped BaSnO3 and improvement of ethanol sensitivity: Heating, nano-CdSnO3 decoration and UV illumination
Formation and dissociation of excitons in La3+-doped BaSnO3 and improvement of ethanol sensitivity: Heating, nano-CdSnO3 decoration and UV illumination
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NSTL
Elsevier
? 2022 Elsevier B.V.Crystalline (Ba1-xLax)SnO3 micron sheets and amorphous CdSnO3 nanospheres were prepared by dehydrating their precursors. The doping of La3+ results in the formation of localized excitons, which are composed of positively charged La?Ba (La+) and negatively charged oxygen vacancies (V′). These excitons cause the blue shift of UV absorption and the improvement of ethanol sensitivity for pure BaSnO3. CdSnO3 sample exhibits a broad UV absorption and its decoration can make (Ba1-xLax)SnO3 sample red shift. The (Ba0.93La0.07)SnO3 sample is more sensitive to ethanol at 500 ppm than other samples, with a maximum gas response (Rmax) of 205.0 at 240 °C. CdSnO3 decoration can reduce the operating temperature of (Ba0.93La0.07)SnO3 sensor under 385 nm UV light, achieving a Rmax of 132.1 at 160 °C for the same gas concentration. The improvement of ethanol sensitivity is owing to the thermal and UV dissociation of localized excitons, which are discussed detailedly in this paper.
CdSnO3 decorationEthanol sensitivityExciton dissociationLa3+-doped BaSnO3Localized states
Wang X.、Leng B.、Yang Z.、Xin J.、Ren Q.
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Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology School of Microelectronics Tianjin University
School of Electrical and Information Engineering Tianjin University
NSTL
Elsevier
