Study on weak-light photovoltaic characteristics of solar cell with a microgroove lens array on glass substrate
The microlens structure is pro-posed on macro photovoltaic glass substrate for high value-added micro-optic performance for thin film solar cell.The objective is to understand how the micro-optic behavior of microlens array is related to indoor power conversion efficiency and outdoor electricity generation of thin film solar cell.First, the influences of microstructure size was theoretically analyzed on the absorption, reflection,scattering of light;then the mirror microgroove array with 500-800 μm in depth was precisely fabricated on by a CNC micro-grinding with micro diamond wheel Ⅴ-tip;finally, the electricity generation capacity and photovoltaic property related to the light intensity and incident angle were experimentally measured, respectively.It is shown that the diamond grinding is likely to fabricate precision and mirror micron-scale lens on glass surfaces.The microgroove lens structured surface is able to absorb and scatter the inclined light to solar cell for improving weak-light conversion efficiency against plane surface.The 800-m-depth micro-groove lens along with 50 mm in macro side enhances the electricity generation by 118-185% in cloudy and overcast days, respectively.The surprising finding is that the microgroove lens produces much larger electricity generation during cloudy day than during sunny day, but traditional plane surface does not do so.
optical design and fabrication microlens solar energy weak-light illumination
Ping Li Jin Xie Jian Cheng Yu Ning Jiang
School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China
国内会议
广州
英文
173-186
2015-05-01（万方平台首次上网日期，不代表论文的发表时间）