Macroporous Silicon (MPS) with Embedded NiO Thin Film for CO2 Gas Sensing

被引:0
作者
M'hammedi, K. [1 ,3 ]
Haine, N. [3 ]
Bourenane, N. [1 ,2 ]
Gabouze, N. [1 ]
机构
[1] CRTSE, 02 Bd,BP 140, Algiers, Algeria
[2] ENSMM, Ex CEFOS Chaiba, BP 233 RP, Annaba, Algeria
[3] USTHB, Fac Phys, BP 32 El Alia, Algiers 16111, Algeria
关键词
Al/NiO/MPS/n-Si structure; Electrical properties; Gas sensing; NICKEL-OXIDE; ROOM-TEMPERATURE; POROUS SILICON; SENSORS; SNO2; SURFACE; NANOPARTICLES; SENSITIVITY; MECHANISMS; NANOWIRES;
D O I
10.1007/s13369-018-3264-5
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In this work, an Al/NiO/MPS/n-Si structure has been used to detect CO2 gas at different concentrations. NiO thin films were deposited by sol-gel dip-coating method onto macroporous silicon (MPS) and glass substrates. The structural and optical properties of the NiO films have been also studied. The XRD characterization shows that the NiO films are polycrystalline with a (200) preferential orientation; the optical band gap of the NiO film determined by spectrophotometry using the Tauc relation is found 3.9 eV. The electrical characteristics of the Al/NiO/MPS/n-Si structure such as current-voltage (I-V), sensitivity-voltage (S-V) and current-time (I-t) measurements have been carried out at room temperature in the presence of CO2 gas. The results show that the electrical characteristics of the sensor are modified in the contact of CO2 gas. The developed sensor exhibited high sensitivity and fast responses. Finally, the mechanisms of CO2 gas and NH3 vapour sensing based on PN heterojunction (NiO/MPS) have been proposed.
引用
收藏
页码:521 / 529
页数:9
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