利用微透鏡結構提升可撓式太陽能波導電池之特性

Abstract

本研究中，主要在可撓式太陽能波導模組中，加上微透鏡結構以提升效率。我們發現在波導模組上加入微透鏡結構，並使光線聚焦在TiO_2散射層底部 ，而導光效率則有明顯的提升，搭配微透鏡結構的可撓式太陽能波導模組最終效率由1.67%提升至1.92%。此外，經由量測並計算側面穿透光損失率和頂面穿透光損失率，可以證實表面微透鏡結構不單只能增加元件的導光效率，也可有效抑制光從其它非電池吸收面的穿透光損失；我們推論元件效率因此而提升，我們並使用光學軟體Tracepro 來作模擬驗證並與實驗結果一併討論。

In this study, we describe flexibility waveguiding photovoltaics (FWPVs) that exhibit higher optical efficiencies with microlens structure than flat-plane. Optical microstructure that increase the light harvesting ability of the FWPVs can be fabricated readily, through soft lithography, on the top surface of the PDMS waveguide. Our optimized microlens structure displayed power conversion efficiency (PCE) of greater than 1.92%. For a waveguiding solar moldule, the major photon losses arise from the top surfaces and edges. According to the measurement of optical loss from the edge in our waveguiding solar module, we found that the focal length affected the intensity significantly; the optimal value of focal length was 5.0 mm. On the other hand, measurement of the top surface losses suggested that degree of photon loss increased upon increasing the interval between the lens. In the end, we used a commercial ray-tracing software to simulate the experimental results. And simulation has emerged recently as an important aid to prove our speculation.