A study on the optical and electrical properties of direct-patternable ZnO films incorporated various contents of Pt nanoparticles

• Published in: Applied surface science Vol. 256; no. 4; pp. 1010 - 1013
• Main Authors: Choi, Yong-June, Wang, Seok-Joo, Kim, Hyuncheol, Koo, Kyoung-Hoe, Park, Hyung-Ho
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30.11.2009; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Direct patterning; Electrical properties of specific thin films; Electrical properties of specific thin films and layer structures (multilayers, superlattices, quantum wells, wires, and dots); Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Materials science; Materials synthesis; materials processing; Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Photochemical solution deposition; Physics; Pt nanoparticles; Sol-gel processing, precipitation; ZnO film; Pt nanoparticles; ZnO film; Photochemical solution deposition; 73.61.Ga; Direct patterning; Valence bands; Patterning; Annealing; Inorganic compounds; Transition element compounds; Electron transfer; Etching; Platinum additions; Crystallinity; Transmittance; Nanoparticles; Sheet resistivity; Zinc oxide; Nanostructured materials; Sol-gel process; Organic compounds; Methanol
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2009.05.058

Platinum nanoparticles were synthesized by the methanol reduction method, and their size was controlled to 3 nm on average using PVP [poly( N-vinyl-2-pyrrolidon)] as a protecting unit. Various contents of Pt nanoparticles were incorporated into ZnO solutions which were synthesized by a sol–gel process. ZnO films with Pt nanoparticles of various content were annealed at 500 °C and 600 °C for 1 h. The crystallinity increased with the annealing temperature and also slightly with the content of Pt nanoparticles. The sheet resistance of ZnO films decreased with the incorporation of Pt nanoparticles, however the decreasing behavior was not maintained with increasing content of Pt nanoparticles. A shift of valence band maximum energy of ZnO film with Pt nanoparticles to higher energy was also observed due to electron transfer from Pt nanoparticles to ZnO film. The optical transmittance was 88 ± 2% in the visible region for all the ZnO films. Well-defined 60 μm wide direct-patterned ZnO films containing Pt nanoparticles of 0.5 atomic percent could be formed without using dry etching process.