Low temperature synthesis of cubic CdSe, HgSe and (CdHg)Se thin films and their characterization

Abstract

Abstract.A low temperature synthesis of CdSe, HgSe and Cd0.sHg0.sSe alloy thin films in cubic modification under similar set of conditions is presented. The method is based on chemical reaction of complexed cadmium sulphate, mercuric nitrate or mixtures of both with sodium selenosulphate in aqueous ammonical medium at 5 ~ The films were characterized by using XRD, Optical absorption, Electrical measurements AAS and EDAX techniques. The films were found to be uniform, well adherent, dark red, nearly stoichiometric and polycrystalline in cubic form without trace of any hexagonallity. The growth of fihn was found to occurs by ion by ion nucleation. CdSe, HgSe and (CdHg)Se films showed optical band gaps at 1.75 eV, 0.81 eV and 1.34 eV respectively. The electIical conductivity of (CdHg)Se alloy was found to be of the order of 10 -2 (f~cm) ~. The rate of increase of conductivity with temperature was found to reduce with the inclusion of mercury. Thermoelectric study indicated the presence of n-type conduction mechanism for all the films.

Morphological and optoelectronic studies on poly-crystalline leaf-like cobalt selenide thin film synthesized using a chemical bath deposition technique

“…Also, CBD is known for its low operating temperature, simplicity in processing, large scale capability and controllability. 15,16 The present paper reports, for the first time, the synthesis of leaf-like poly crystalline CoSe thin films using the CBD method. So far, we could locate only a lone reference in the literature which reports the formation of amorphous CoSe using CBD.…”

Chemical Functionalization of Pentagermanene Leads to Stabilization and Tunable Electronic Properties by External Tensile Strain

“…Therefore, the band gap is reduced with increasing biaxial strain. Additionally, the zinc blende CdSe with lattice constant a = 6.05 Å can be a potential substrate for the experimental realization of ε = 6% strain . On the other hand, when the nanosheet is subjected to a compressing strain, its CBM is influenced and moves toward the Fermi level.…”

“…Additionally, the zinc blende CdSe with lattice constant a = 6.05 Å can be a potential substrate for the experimental realization of ε = 6% strain. 57 On the other hand, when the nanosheet is subjected to a compressing strain, its CBM is influenced and moves toward the Fermi level. The band gap of F−pGe−F is found to monotonously decreased, as shown in Figure 4e.…”

Hydrochemical synthesis of thin films of mercury chalcogenides (HgS and HgSe): A brief review

“…Therefore, the selection of a synthesis method becomes crucial to enable the production of films with reproducible properties. Currently, films of mercury chalcogenides, heterostructures, and solid solutions based on them have been successfully produced using a variety of methods, including vacuum deposition [ 28 ], magnetron sputtering [ 29 ], cathodic deposition [ 30 ], radiofrequency deposition [ 31 ], molecular beam epitaxy, and liquid phase epitaxy [ 32 ], electrochemical deposition [ [26] , [33] , [34] ], metalorganic compound deposition from the gas phase [ 29 , 32 , [27] , [35] , [36] ], spray pyrolysis [ 37 ], and chemical solution deposition [ [38] , [39] , [40] , [41] , [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] , [55] , [56] , [57] , [58] , [59] , [60] , [61] , [62] , [63] , [64] ].…”

“…A substantial number of works focus on the synthesis of mercury chalcogenide films at temperatures ranging from 0 to 40 °C [ 38 , 42 , 44 , 45 , [47] , [48] , [49] , [50] , [51] , 54 , 56 ], whereas fewer studies concentrate on synthesis at temperatures from 60 to 90 °C [ 39 , 43 , 46 , 52 , 53 , 55 , 57 ]. Authors [ 47 , 49 , 51 , 63 ] additionally conducted reagent mixing at 5 °C with a subsequent temperature increase to room temperature over several hours. According to the authors, using low temperatures during mercury chalcogenide film synthesis is essential to slow the release of sulfide ions and dissociate mercury ions from their complexes.…”