Comparative study of annealing and gold dopant effect on DC sputtered vanadium oxide films for bolometer applications

• Published in: Optical and quantum electronics Vol. 49; no. 7; pp. 1 - 10
• Main Authors: Alaboz, H., Demirhan, Y., Yuce, H., Aygun, G., Ozyuzer, L.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2017; Springer Nature B.V
• Subjects: Alloys; Annealing; Bolometers; Characterization and Evaluation of Materials; Cobalt; Coefficients; Computer Communication Networks; Deposition; Detection and Applications (SMMO 2016); Detectors; Direct current; Doping; Electrical Engineering; Electrical properties; Electrical resistivity; Generation; Gold; High resistance; Lasers; Magnetron sputtering; Optical Devices; Optics; Optimization; Oxide coatings; Oxygen; Partial pressure; Photonics; Physics; Physics and Astronomy; Silicon substrates; Temperature; TERA-MIR Radiation: Materials; Thin films; Vanadium; Post annealing; Vanadium oxide; TCR; Magnetron sputtering; Gold doping
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-017-1072-x

Vanadium oxide (VO x ) thin film has been widely used for IR detectors and it is one of the promising materials for THz detectors due to its high temperature coefficient of resistance (TCR) values. VO x films with proper TCR values have also high resistance and it restricts bolometer performance especially for uncooled bolometers. To overcome this problem, deposition at elevated temperatures or annealing approach has been accepted and used but gold co-deposition approach has been proposed recently. In this study, vanadium oxide films were fabricated on high resistivity silicon substrates by reactive direct current magnetron sputtering in different O 2 /Ar atmosphere at room temperature. We investigated influence of oxygen partial pressure during deposition process and fabricated VO x thin films with sufficient TCR values for bolometer applications. In order to decrease resistivity of the deposited films, post annealing and gold doping approaches were performed separately. Effect of both post annealing process and gold doping process on structural and electrical properties of VO x thin films deposited at room temperature were investigated and detailed comparison between these methods were presented. We obtained the best possible approach to obtain optimum conditions for the highly reproducible VO x thin films which have the best resistivity and suitable TCR value for bolometer applications.