Numerical analysis of an influence of oxygen adsorption at a SnO₂ surface on the electronic parameters of the induced depletion layer

Abstract

In this work the influence of oxidation of a SnO 2 thin film on the development of a depletion layer was studied by using computer simulations. The surface potential and in-depth potential profiles in the depletion region were calculated by solving the Poisson-Boltzmann equation for finite SnO 2 flat grains (partially or totally depleted) using slab geometry. The effect of the donor (oxygen vacancies in the bulk) mobility on electrical potential inside grains with different thicknesses was discussed. Furthermore, in-depth profiles of mobile donor N d (r) and electron n(r) concentrations in the depletion layer were computed for different densities of negative charge trapped in the surface states, as a result of oxygen adsorption. It was assumed that the bulk oxygen vacancies (donors) are singly ionized and mobile.

Electrical and optical properties of single zigzag SnO2 nanobelts

“…It has been shown theoretically and experimentally that oxygen species affect the electrical and optical properties of metallic oxides. 43,68,69 The carrier concentration and broad peak in the PL spectra reflects the same. Anh et al 70 observe that the electrical current is linearly proportional to the amount of oxygen vacancies.…”

Xona Haroratida Ammiak Monitoring Uchun Gaz-Sezgir Sensor Materialini Ishlab Chiqish

“…In recent years, environmental pollution has seriously increased due to toxic gases such as ammonia, triethylamine, etc. [1][2][3]. To monitor these gases, great efforts have been made to develop various sensors useful in the food and chemical industries, agriculture, medicine, etc.…”

“…1.Kirish. So'nggi yillarda ammiak, trietilamin va boshqalar kabi zaharli gazlar tufayli atrof-muhitning ifloslanishi jiddiy ravishda oshdi [1][2][3]. Ushbu gazlarni nazorat qilish uchun oziqovqat va kimyo sanoati, qishloq xo'jaligi, tibbiyot va hokazolarda foydali bo'lgan turli xil sensorlarni yaratish bo'yicha katta say-harakatlar amalga oshirildi.…”

Non-parabolic intergranular barriers in tin oxide and gas sensing

“…After having demonstrated the equivalence of the approaches, in what follows, we will follow Lantto's work and his notation 6 to describe the effect of oxygen in-and out-diffusion in the formation of intergranular barrier. Now, assuming that oxygen vacancies are the only relevant charged particles (strictly, this is only valid for fully depleted slabs 17 ) by resorting to the Poisson's equation the potential V(x) can be deduced to be…”