DEPENDENCE OF EFFICIENCY ON SLAT ANGLES OF MICROGROOVED SOLAR-CELLS

The short circuit current of a monocrystalline silicon solar cell can be enhanced further by suitably modifying the slat angle of its microgroove surface due to reduction in reflection coefficient and increase in optical trapping with decreasing slat angle. In this paper the dependence of I(sc), V(oc) and eta of a solar cell on the slat angle have been computed taking into account the variation of the reflection coefficient with the slat angle. It is observed that I(sc) increases while V(oc) decreases significantly with decreasing slat angles leading to a maximum efficiency of about 22% corresponding to a slat angle range lying between 30-degrees and 45-degrees without antireflection coating. However, the efficiency can be increased further to about 25% with AR coating.