科研之友
微信
新浪微博
Facebook
分享链接
摘要
In order to quantify the higher power output seen from solar cells with a three-dimensional (3D) topology due to the increased interactions between photons and the cell surface, we have derived a formula for the average number of interactions, Gamma, between a photon and the cell surface for 3D cells with vertical sidewalls and flat tops. We have derived Gamma for three different cell morphologies, an infinite trench in the x- or y-direction, an enclosed box, and an infinite two-dimensional (2D) array of towers. Monte Carlo simulations were carried out in order to compare computational results for Gamma with those derived. For varying distance between features, d, and photon azimuthal angle, the data fits the derived expressions quite well for a large range of values. For varying tower height, the data fits theory well for both the trench and box morphologies, however, theory overestimates the value of Gamma for the 2D array of towers. This is due to simplifications made when deriving Gamma. However, the error associated with Gamma is small enough that it propagates to a measured power output error of less than 1% for cells with an absorbance efficiency of at least 25%. Even with simplifications, the derived expression for Gamma should be usable for predicting the increased power output for 3D cells with vertical sidewalls and flat tops.
- 出版日期2011-9
