Влияние отжига на ВАХ гетероперехода n-ZnO—p-InSe

Abstract

Методом высокочастотного магнетронного напыления сформирована тонкая оксидная пленка ZnO на ван-дер-ваальсовой поверхности моноселенида индия. Исследовано влияние вакуумного низкотемпературного отжига на электрические и фотоэлектрические характеристики гетероперехода n-ZnO—p-InSe. Приведены температурные зависимости ВАХ гетероперехода до и после отжига. Установлена область спектральной фоточувствительности гетероструктуры n-ZnO—p-InSe.

Методом високочастотного магнетронного напилення була сформована тонка оксидна плівка ZnO на ван-дер-ваальсовій поверхні моноселеніда індію. Досліджено вплив вакуумного низькотемпературного відпалу на електричні та фотоелектричні характеристики гетеропереходу n-ZnO—p-InSe. Наведено температурні залежності ВАХ гетеропереходу до і після відпалу. Встановлена область спектральної фоточутливості гетероструктури n-ZnO—p-InSe.

The article is devoted to studying of influence of vacuum low-temperature annealing on the electrical and photoelectric characteristics of n-ZnO-p-InSe heterostructure.Indium monoselenide (InSe) is a semiconductor of the A³B⁶ group of layered compounds. The basic unit consists of two planes of metal atoms sandwiched between two planes of chalcogen atoms (Se-In-In-Se). The absence of dangling bonds on InSe cleaved surface makes it possible to use this semiconductor as a substrate for fabrication of heterostructures based on semiconductor materials with different symmetries and lattice spacings. Zinc oxide (ZnO) is the most suitable material for window materials and solar cells buffer layers application due to its marvelous transparency in the range of visible region.InSe single crystals were grown by the Bridgman technique from a nonstoichiometric melt and characterized by a pronounced layered structure along the whole length of a sample. ZnO thin oxide film was formed on freshly cleaved van der Waals surface of InSe layered crystal. n-ZnO-p-InSe heterostructure was prepared by the method of high-frequency magnetron sputtering. Sensitivity spectral areas were identified by MDR-3 monochromator with a resolution of 2.6 nm/mm. The current-voltage characteristics of the n-ZnO-p-InSe heterostructures showed a clearly pronounced diode character. In the forward bias of the initial samples, the diode factor had the value 3.7 at room temperature. It is shown that vacuum low-temperature annealing reduces shunt currents of the heterojunction, which is reflected in the decrease in the values of n from 3.7 to 2.7.