title: Study on weak-light photovoltaic characteristics of solar cell with a microgroove lens array on glass substrate.
abstract: Microgroove lens with 500-800 µm in depth is proposed on the glass substrate of thin-film solar cell. The objective is to improve photovoltaic characteristics under weak-light illumination. First, the micro-optical characteristics were theoretically studied in connection with micro-lens structure; then a diamond micro-grinding was employed to fabricate microgroove lens; finally, indoor conversion efficiency and outdoor electrical generation were measured. It is shown that the 800-µm-depth microgroove lens is able to absorb and scatter the inclined light to solar cell for improving weak-light conversion efficiency. It enhances the electricity generation by 118% and 185% in cloudy and overcast days, respectively.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Jin
authors.initials: J
authors.lastname: Xie
authors.forename: Jian
authors.initials: J
authors.lastname: Cheng
authors.forename: Yu Ning
authors.initials: YN
authors.lastname: Jiang