Subcategory: Materials Science
Jasmine Beckford - Norfolk State University
Co-Author(s): Makhes K Behera, Norfolk State University, Norfolk, VA; Sangram K Pradhan, Norfolk State University, Norfolk, VA; Messaoud J Bahoura, Norfolk State University, Norfolk, VA
There is an increased interest in thin film transparent heaters (TFTH) for applications in optoelectronics, and a plethora of domestic usages such as smart windows, defrosters in automobiles and many other applications. In this work we present the growth and characterization of two efficient TFTHs made up of Gallium doped zinc oxide (GZO) and Aluminum doped zinc oxide (AZO). GZO thin films were deposited by pulsed laser deposition (PLD) on transparent substrates such as glass and flexible polymer. Ga doped (5 atomic weight percentage) ZnO target was made in the laboratory using Ga2O3and ZnO powder. GZO and AZO films were deposited on glass and flexible polymer at substrate temperatures of various temperatures with a respective average thickness of 110nm and 150nm. Atomic force microscopy images reveal that the films are very smooth with excellent surface roughness (~1.18 nm and ~1.38nm). The temperature dependent resistivity measured was done using linear four probe measurement and the samples showed a very low sheet resistance value of about 2.6×10-4 Ω cm and 3.8×10-4 Ω cm of GZO and AZO respectively. Also both TFTHs exhibited high optical transparency value of (>90%) from transmission data. Both GZO and AZO transparent heaters showed a stable and reproducible Joule heating effect and the temperature can reach easily 100°C by the application of low input (~8V) voltage. This research finding may be beneficial for the potential use both GZO and AZO as transparent oxide materials for possible applications in the emerging area of low-cost power electronics, and flexible and wearable optoelectronics devices.
Funder Acknowledgement(s): NSF-CREST Grant number HRD 1036494; NSF-CREST Grant number HRD 1547771
Faculty Advisor: Dr. Messaoud Bahoura, firstname.lastname@example.org
Role: I created the GZO target for the PLD. I also did the growth and characterization of each material. I also plotted and graphed the data.