Oxygen

About: Oxygen is a research topic. Over the lifetime, 48149 publications have been published within this topic receiving 1113788 citations. The topic is also known as: O & Oxygen.

Control of p- and n-type conductivity in sputter deposition of undoped ZnO

Abstract: Recent theoretical studies have concluded that the low formation enthalpies of intrinsic donor defects should preclude achievement of p-type conductivity in undoped ZnO grown in thermal equilibrium with a molecular oxygen reservoir. This letter demonstrates that reactive sputtering can produce intrinsic p-type ZnO, controlled by adjusting the oxygen partial pressure in the sputtering plasma. We report the properties of p–n homojunctions fabricated in this way, and characterize transport in the films by Hall measurements. Our finding of p-type conductivity in undoped ZnO grown with dissociated oxygen is qualitatively consistent with the effect of higher chemical potential of atomic oxygen reactant on defect formation enthalpies. This parallels to some degree the recent attention to nitrogen acceptor incorporation by means of dissociating nitrogen source gases.

Oxygen mobility in silicon dioxide and silicate glasses: a review

Abstract: Silicon dioxide and silicate glass films are formed on silicon nitride and silicon carbide ceramics during exposure to high-temperature oxidising atmospheres, and oxygen transport through the film is potentially a rate-controlling step. Recent published literature concerning oxygen permeation and diffusion through amorphous and crystalline silicon dioxide, and silicate glasses, is reviewed. Data for diffusion coefficients are collected to facilitate the assessment of probable dominant oxygen transport mechanisms, and associated rates, under given sets of oxidation conditions.