Progress toward 17% Efficiency in Large Area CIS-Based Thin-Film Submodules
| Autor: | Sugimoto, H., Chiba, Y., Kawaguchi, Y., Morimoto, T., Yagioka, T., Nagahashi, M., Miyano, T., Kijima, S., Aramoto, T., Tanaka, Y., Hakuma, H., Kuriyagawa, S., Kushiya, K. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| DOI: | 10.4229/25theupvsec2010-3bv.2.137 |
| Popis: | 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 3529-3532 The efficiency of 16.3% on a 30x30cm2-sized CIS-based thin-film submodule has been achieved by optimizing its absorber thickness and circuit design. The thicker absorber led to a larger current density (Jsc). However, it caused a drop in a fill factor (FF) originated from a deterioration of a vertical series resistance (Rs). We found that the FF dropping could be restricted by an optimization of a sulfurization degree in a crystallization process of the absorber. From electron back scattering diffraction maps and electron beam induced current analysis, we observed an enlargement of a grain size and an extension of a space charge region in the absorbers with the higher sulfurization-degree process. Glow discharge optical emission spectrometry showed that the higher sulfurizationdegree process enhanced a Ga diffusion. These results clearly showed that the FF improvement came from the refinement of the absorber quality. A horizontal Rs was also reduced by reviewing the circuit design. Narrowing a cell width was one of the effective ways to reduce the horizontal Rs, however, it made the Jsc lower. In order to prevent the Jsc lowering, a possible reduction of dead areas for a monolithically integration was executed. Then the cell width was optimized by using a self-made device simulator. These results enabled us to accomplish the high-level FF without the Jsc lowering. The new challenge toward the 17% efficiency is just beginning. We believe that the above mentioned steady efforts could lead us to the accomplishment of the 17% milestone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|