Synthesis and characterization of CrSe thin film produced via chemical bath deposition

Abstract

are rarely produced. However, CrSe alloy is a very interesting material because of its magnetic properties [1]. The chromium selenide analogue Cr (1 − x) Se (x) is well known as antiferromagnetic [2]. The metallic chromium selenides as Cr 3 Se 4 and Cr 2 Se 3 are antiferromagnets and semiconductors [3][4][5]. Some transition metal chalcogenides are found to be excellent candidates for half-metallic ferromagnets according to literature [6].It is already known that chromium selenide has a monoclinic structure, located at I2/m space group, and crystallizes as Cr 2 Se 3 and Cr 7 Se 8 , Cr 3 Se 4 [5]. The structure of chromium selenides is similar to NiAs and both of them have vacancies in their second metal-atom layer. The researchers found that if the structure is rich in Cr, the material shows antiferromagnetic behavior, whereas metaor ferromagnetic order was observed in Cr-poor samples [5][6][7][8][9][10][11]. It is very important to produce such material which possesses so many features.The aim of this paper is to produce CrSe thin film using a new method of chemical bath deposition and to examine its structure and optical properties. It is argued that crystal structure and optical properties of CrSe could be controlled by the pH of chemical bath. It is clear that producing CrSe thin films via chemical bath deposition is much more advantageous to the researchers since it is a simple and cheap method to fabricate. Since the production of CrSe via chemical bath deposition, which is a simple and cheap method, is quite difficult, the most appropriate reagents should be selected. Also, this is a new method for producing CrSe thin films. According to the literature mentioned above, CrSe alloys usually result in amorphous structure, thus it is quite difficult to produce crystalline form.Abstract Chromium selenide (CrSe) crystalline thin film has been produced via chemical bath deposition on substrates (commercial glass). Transmittance, absorption, optical band gap and refractive index of the films have been examined by UV/VIS. Spectrum. Structural properties have been examined and XRD hexagonal form has been observed. The structural and optical properties of CrSe thin films, produced at different pH levels were analyzed; SEM and EDX analysis have been performed for surface analysis and elemental ratio of the films. It has been found that some properties of the films have been changed with pH and the changes of these properties with respect to pH have been investigated. Tested pH values were between 8 and 11. The optical band gap has been varied between 3.80 and 3.92 eV and film thickness has been changed from 76 nm to 126 nm for tested pH levels. Absorbance values were found to be 0.053, 0.018, 0.012 and 0.069 for pH values of 11, 10, 9 and 8, respectively (550 nm wavelength). The refractive index of CrSe thin films have been changed with film thickness, found as 2.27, 2.24, 2.25 and 2.26.

Effects of Pb nanosheets substrates on the optical and electrical properties CrSe thin films

“…These films together with the graphene/CrSe heterostructure showed quantum Hall plateau and quantum oscillations assuring the successful application of CrSe in nano-electronics [11]. CrSe thin films prepared by CBD technique displayed wide variety in the optical and dielectric properties which can be controlled by varying the PH value [12,13]. Unfortunately chromium selenide thin films prepared by this method showed low dielectric constant values [12,13].…”

“…CrSe thin films prepared by CBD technique displayed wide variety in the optical and dielectric properties which can be controlled by varying the PH value [12,13]. Unfortunately chromium selenide thin films prepared by this method showed low dielectric constant values [12,13]. This feature makes the use of CrSe in high k optoelectronics hardly possible.…”

Refractory‐Metal‐Based Chalcogenides for Energy

“…The researcher repeated the measurements by changing the pH value of the chemical bath between 8 and 11 and showed that the optical bandgap of the forbidden energy range is changing with changing pH values. [ 226 ]…”

“…The researcher repeated the measurements by changing the pH value of the chemical bath between 8 and 11 and showed that the optical bandgap of the forbidden energy range is changing with changing pH values. [226] Kocyigit et al fabricated a photodiode by using a Cu 2 WSe 4 interfacial layer and examined the photoelectrical, morphological, and capacitive attitudes. In the performed measurements, they found the ideality factor and barrier height values as 4.84 and 0.82 eV, respectively.…”

A short review of CdTe and CdSe films: growth and characterization

“…Optical properties such as refractive index (1.16 to 1.54), extinction coefficient (5.1 X 10 -4 to 4.9 X 10 -3 ), real dielectric constant (2.36 to 1.36) and band gap (1.7 to 2.3 eV) were investigated under various pH values (pH 10-13). Kariper 67 conclude that increasing the pH from 7 to 10 could increase the film thickness (74.6 to 138.2 nm) because of the presence of hydroxide ions in the media. Further, the researcher explains that transmittance (16.7 to 52.5 %) and reflectance (16.7 to 39.7 %) data did not vary based on film thickness due to either cadmium or selenium was dominant in specific experimental conditions.…”