Selectively Absorbing Properties of Sol Gel Dip Coated Indium Tin Oxide Thin Films on A Glass Pane
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SELECTIVELY ABSORBING PROPERTIES OF SOL GEL DIP COATED INDIUM TIN OXIDE THIN FILMS ON A GLASS PANE HYUNG-JIN JUNG, HEE-HYUNG LEE, DONG-HEON LEE AND JEON-KOOK LEE Division of Ceramics, Korea Institute of Science and Technology, Seoul 130-650, Korea ABSTRACT Selectively absorbing properties of indium tin oxide(ITO) thin film were characterized in UV-VIS-NIR wavelength regions. Sodium diffusion from glass pane had a bad influences on the properties of ITO layers. So silica-zirconia barrier layers were formed by sol gel dip coating. ITO films on buffer layered glass pane were formed by sol gel dip coating. Transmittance and reflectivity dependence on the thickness of barrier layer and ITO coating layers were studied by measuring sheet resistance and UV-VIS-NIR spectroscopy. Transparency at 550 nm wavelegth and selective reflectivities were important to apply to passive solar collectors. In single barrier layer and six-fold ITO coated films, good selectivities were obtained. Homogeneity of indium tin precursor coating solution was important. Atmosphere condition (humidity, temperature), dip and drawing conditions were also additional factors for uniformity of films. INTRODUCTION Indium tin oxide(ITO) films on a glass pane selectively transmit the solar radiation and reflect long wave infrared radiation. Such a good passive solar collector possess high solar energy input combined with excellent heat insulating properties. ITO films has commercially been coated by radio frequency sputtering methods. But this apparatus is expensive and this process is difficult to coat large area[l]. Sol-gel processing can be used in depositing on a glass a number of layers of different oxide materials with precise optical thickness so as to obtain wavelength selective optical effects[2-5]. The optical properties of ITO films are sensitive to the interfacial reaction between films and soda lime glass, which is depend on the thickness of Si0 2 -ZrO 2 barrier layer and the heat treating temperature and atmosphere. In the present work, we prepared ITO films on buffered soda lime glass window glass by sol gel dip coating. The effects of barrier layers and heat treating temperature on the wavelength selectivity were studied. EXERIMENTAL Coating Solutions To prepare Si0 2 -ZiO 2 barrier layers, orthosilicate (99%,Alfa), ethanol (Merk), water,
tetraethyl acetic acid
Mat. Res. Soc. Symp. Proc. Vol. 228. c 1992 Materials Research Society
328
Table I
Batch Compositions of Si0 2 -ZrO 2 Barrier Layer and
ITO Coating Solutions.
unit; moles.
Barrier layer 1 (0.34M) 0.28
Si(OC2 Hs) 4 ZrOCl 2 - 8H2 0 H20
-
8.21 0.25 -
CH3COOH In(N0 3 ) 3 -x11 2 0 SnCl
ITO
- 5H20
-
1 (0.2M) 0.08 residue
-
C2 HSOH
residue
(AR,J.T.Baker) are combined in the indicated sequence and thoroughly mixed. The mixture is allowed to stand at room temperature. Then zirconyl chloride (99%,Aldrich) dissolved in ethanol is added to the Si precursor solution according to the batch composition listed Table I [6). Indium(III) nitrate (5N, Aldrich) is dissolved in ethanol
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