Composition Tuning of Single Step Electrodeposited CuInSe2 Thin Films Using Sodium Dodecyl Sulfate as Additive

• Published in: Journal of electronic materials 2019-12, Vol.48 (12), p.8129-8137
• Main Authors: Chandran, Ramkumar, Behera, Akhya Kumar, Mallik, Archana
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Characterization and Evaluation of Materials; Chemistry and Materials Science; Citric acid; Copper indium selenides; Copper selenides; Deposition; Electrochemical analysis; Electronics and Microelectronics; Instrumentation; Materials Science; Micelles; Morphology; Optical and Electronic Materials; Sodium dodecyl sulfate; Solid State Physics; Substrates; Thin films; Tuning
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-019-07658-w

CuInSe 2 (CISe) thin films were electrodeposited on FTO substrates by single step deposition technique from an aqueous solution containing CuCl 2 , InCl 3 , HSeO 3 − ions and citric acid-sodium dodecyl sulfate (SDS) as the pH adjuster and additive, respectively. The effect of SDS concentration on the structural, composition, morphology and photo-electrochemical properties was characterized by SEM/EDAX, XRD, Raman and electrochemical (PEC) studies. The linear sweep voltammetry (LSV) and electrochemical impedance (EIS) results revealed that the addition of SDS limits the Cu-Se incubation time and enhances the diffusion controlled process which is considered to be the origin of the compositional and morphological tuning nature of the SDS in CISe deposition. The structural, compositional and PEC analysis revealed that for SDS concentration less the critical micelle concentration has almost no effect in controlling the Cu 2 Se secondary phase. The samples deposited in the presence of SDS (> 8 mM) exhibited better PEC properties due to the reduced Cu 2 Se phase. Further, the Mott–Schottky analysis of all the as-deposited thin films exhibited p -type conductivity.