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A Study on Rheology Characteristics of Ag Paste for Screen Printing Method for Silicon Solar Cells Electrodes Capable of Forming High Aspect Ratio  

Oh, Tae-Hun (Dept. of Graphic Arts Engineering, Graduate School, Pukyong National University)
Kim, Sung-Bin (Dept. of Graphic Arts Information, College of Engineering, Pukyong National University)
Nam, Su-Yong (Dept. of Graphic Arts Information, College of Engineering, Pukyong National University)
Publication Information
Journal of the Korean Graphic Arts Communication Society / v.28, no.1, 2010 , pp. 15-24 More about this Journal
Abstract
Photovoltaic solar cells are all in the incident because they are not converted into electrical energy, high-efficiency solar cells in order to reduce the loss of elements must be. Significant factor in the loss of solar cells, optical loss and electrical loss can be divided into. Optical losses occur when the sun will be joined on the surface of the reflection, the shadow loss due to electrodes, and the losses are in the solar wavelengths. Commercialization is currently the most common solar cells on the front of the light incident on the electrode is formed. Therefore, the shadow caused by the electrode to cover the dead area of the sun, due to factors that hinder the absorption of sunlight which is shadowing them and conversion efficiency of solar cells is the inhibition factor. These barriers to eliminate the electrode linewidth reduces the shadowing to reduce, but simply of the electrode line width is reduced electrode area by reducing the series resistance elevates this because to improve the electrode Aspect ratio(height/width) to increase Ag development of paste is required. In this study, aspect ratio of screen-printing method to increase the electrode Ag paste composition of the binder for the characterization of rheology in the shadow of the electrode by reducing the optical loss of the photoelectric conversion efficiency of solar cells to boost the performance measures was. Properties and printability of the paste, the binder resin sintered characteristics that affect the thermal properties are excellent with a good screen printability acrylic resin, ethyl cellulose, using a resin were evaluated. Prepared paste rheology properties, was formed to evaluate the electrode conductivity and aspect ratio.
Keywords
silicon solar cells; screen printing; aspect ratio; Ag paste; characterization of rheology;
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