THESIS
2017
xiv, 53 pages : illustrations ; 30 cm
Abstract
Photovoltaic systems have widely been applied as a major renewable energy resource in our daily life because they can directly convert solar energy into electricity without making pollutions and huge construction cost. The solar panels are installed outdoors and exposed to extreme environmental conditions such as dust, UV irradiation, and heat. Therefore, solar cell devices must be packaged with protection layer. But this protection layer may cause a huge reflection of sunlight at the surface. An effective and low-cost nanostructured anti-reflection (AR) technique has long been desired to enhance the performance of high-efficiency photovoltaic devices because it can maximize the light absorption of photovoltaic devices by reducing surface light reflection. However, in the past such kind...[
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Photovoltaic systems have widely been applied as a major renewable energy resource in our daily life because they can directly convert solar energy into electricity without making pollutions and huge construction cost. The solar panels are installed outdoors and exposed to extreme environmental conditions such as dust, UV irradiation, and heat. Therefore, solar cell devices must be packaged with protection layer. But this protection layer may cause a huge reflection of sunlight at the surface. An effective and low-cost nanostructured anti-reflection (AR) technique has long been desired to enhance the performance of high-efficiency photovoltaic devices because it can maximize the light absorption of photovoltaic devices by reducing surface light reflection. However, in the past such kinds of nanostructured film have been mostly fabricated with costly processes and small size which limit their practical applications.
In this thesis, large-scale, nano-engineered wafer templates were fabricated to massively produce flexible and anti-reflection films. The optical and electrical improvement was theoretically and experimentally studied by attaching the AR films on polycrystalline Si solar cells. It obviously shows that large-scale AR films have the ability to reduce the surface reflection and enhance the electric output of photovoltaic devices. The improvement is more pronounced at larger light incident angle which is analogous to the daily operation of photovoltaic devices. Additionally, for satisfying the industrial demand, we have demonstrated the nanostructured self-cleaning and antireflection film fabrication by low-cost and high-efficiency roll to roll hot embossing methods. Though roll to roll hot embossing process, the nanopattern can be transferred to FEP film. The 18 cm width and 2 meters length anti-reflection and self-cleaning film has been fabricated. It can be integrated on thin film or rigid solar cell easily.
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