박막태양전지의 광포획 기술 현황

• Published in: Current Photovoltaic Research Vol. 2; no. 3; pp. 95 - 102
• Main Authors: 박형식(Hyeongsik Park), 신명훈(Myunghoon Shin), 안시현(Shihyun Ahn), 김선보(Sunbo Kim), 봉성재(Sungjae Bong), Anh Le Tuan, S. Q. Hussain, 이준신(Junsin Yi)
• Format: Journal Article
• Language: Korean
• Published: 한국태양광발전학회 2014
• Subjects: Multi-scale texturing; Light trapping technique; Silicon thin film solar cell; Multi-junction solar cell; Transparent conducting oxide
• ISSN: 2288-3274; 2508-125X

Light trapping techniques can change the propagation direction of incident light and keep the light longer in the absorption layers of solar cells to enhance the power conversion efficiency. In thin film silicon (Si) solar cells, the thickness of absorption layer is generally not enough to absorb entire available photons because of short carrier life time, and light induced degradation effect, which can be compensated by the light trapping techniques. These techniques have been adopted as textured transparent conduction oxide (TCO) layers randomly or periodically textured, intermediate reflection layers of tandem and triple junction, and glass substrates etched by various patterning methods. We reviewed the light trapping techniques for thin film Si solar cells and mainly focused on the commercially available techniques applicable to textured TCO on patterned glass substrates. We described the characterization methods representing the light trapping effects, texturing of TCO and showed the results of multi-scale textured TCO on etched glass substrates. These methods can be used tandem and triple thin film Si solar cells to enhance photo-current and power conversion efficiency of long term stability.