Indium doping on the structural, surface and optical properties of CdS thin films prepared by ultrasonic spray pyrolysis method

Abstract

CdS nanostructures are important and useful materials for photovoltaic applications. In this paper, pure CdS and In doped CdS (CdS:In) thin films were fabricated on soda lime glass substrate using ultrasonic spray pyrolysis (USP) method, to investigate the effect In concentration on the structural behavior, surface and optical properties of the CdS thin films by X-ray diffraction (XRD), Atomic Force Microscopy (AFM) and Ultraviolet–visible (Uv-vis) spectrophotometry. X-ray diffraction patterns of the pure and In doped CdS films indicated that pure CdS film had a mixed of cubic and hexagonal structure with polycrystalline nature while In doped CdS had a hexagonal structure with polycrystalline nature. Increasing the In doping ratio improve the (002) preferential orientation. The optical properties of the In-doped CdS and pure CdS films showed that the energy band gap of the In-doped CdS is a slightly lower than the energy band gap of the pure CdS film. The surface properties of the films showed that all thin films are compact and uniform.

Keywords

• CdS,Indium doping,Ultrasonic spray pyrolysis,structural properties

Ultrasonik sprey piroliz yöntemiyle hazırlanan CdS ince filmlerin yapı, yüzey ve optik özelliklerine In katkısının etkisi

Abstract

CdS nanoyapılar fotovoltaik uygulamalar için önemli ve yararlı malzemelerdir. Bu çalışmada, katkısız CdS ve In katkılı CdS (CdS: In) ince filmler ultrasonik sprey piroliz (USP) yöntemi kullanılarak cam alttaş üzerine büyütüldü ve X ışını kırınımı (XRD), Atomik Kuvvet Mikroskopisi (AFM) ve spektrofotometri ile CdS ince filmlerin yapısal davranışları, yüzeyleri ve optik özellikleri üzerine konsantrasyonun etkisini araştırıldı. Saf ve In katkılı CdS filmlerin X-ışını kırınım desenleri, saf CdS filmin polikristal yapıya sahip bir kübik ve altıgenken, In katkılı CdS'nin polikristal yapılı altıgen bir yapıya sahip olduğunu görüldü. In katkılama oranının arttırılması tercihli yönelimi (002) artırdı. In-katkılı CdS ve saf CdS filmlerin optik özellikleri In-katkılı CdS'nin enerji bant aralığının saf CdS filmin enerji bant aralığından biraz daha düşük olduğunu görüldü. Filmlerin yüzey özelliklerinden tüm ince filmlerin kompakt ve düzgün olduğunu görülmektedir.

Keywords

• CdS,İndiyum katkılama,Ultrasonik sprey piroliz,yapısal özellikler

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