全固態離子型薄膜元件開發

Abstract

本計畫主要目標是發展具有奈米抗反射層(Anti-reflective coating; ARC)結構的銅銦鎵硒(Cu(In,Ga)Se2; CIGS)薄膜太陽能電池技術。利用奈米結構的抗反射層來增加光捕獲效果(Light trapping)，以提昇CIGS 太陽能電池的光電轉化效率。在此計劃中，我們不使用任何催化劑或模板來輔助薄膜成長，即可利用簡易的水熱法來合成柱狀與花瓣狀的氧化鋅奈米結構層。藉由藥品溶液的濃度、試劑的化學計量、溫度與酸鹼度(PH)的優化，我們可以控制奈米結構的尺寸和幾何形狀。最後，將氧化鋅奈米陣列應用於無硒化銅銦鎵硒薄膜太陽能電池元件的製作，以達成全波段低反射效果與提昇太陽能電池元件光電轉換效率。在整個研究的過程中，我們也嘗試將無硒化銅銦鎵硒薄膜應用在可撓式不鏽鋼基板上，作為可撓式(R2R) CIGS 薄膜太陽電池的塑膠基板材料，朝向可撓性、大面積、低耗能、低成本及環保製程為目標。

Solar cells are one of the most important devices of renewable energy, because of their ability to convert sunlight directly to electrical energy. Therefore, efficiency boosting techniques like advanced antireflection coatings (ARCs) are highly demanded. In this project, we will propose a simple hydrothermal route to synthesize the rod-like and flower-like ZnO nanostructures without the use of any catalysts, in order to reduce the surface reflection of Cu(In,Ga)Se2 (CIGS) thin film colar cell device. Moreover, the size and shape of the nano-structures grown by this technique can be controlled by adjusting the growth parameters, such as the concentration of chemical solution, reagents stoichiometry, temperature and pH value. The crystallinity, structure, and morphology of ZnO nanoparticles will be examined and the formation mechanism will be discussed from the angle of nucleation and morphology. Furthermore, optical properties of as-synthesized ZnO nanostructures will be studied. Finally, the Cu(In,Ga)Se2 thin film solar cells with ZnO nanorod antireflective coatings will be manufactured and studied for the improvement of conversion efficiency. In the study, we'll aim for flexible (Roll-to-Roll), large-area, low-energy, low-cost and environmentally friendly on the fabrication of the CIGS solar cells using the stainless-steel substrates.