A BENCHMARKING STUDY OF THE APPLICATION OF A DISTRIBUTED BRAGG REFLECTOR AS BACK-REFLECTOR ON N-PASHA SOLAR CELLS

摘要

A Distributed Bragg Reflector (DBR) optimized for textured substrates was applied as back-reflector to n-Pasha (bifacial) cells. The (infrared) light trapping performance was evaluated and compared to high quality back-reflectors (BRs, i.e. Ag, TiO_2) and to a reflective white backsheet (in a single cell laminate). It was found that compared to the open-rear configuration the DBR improves the response to the infrared similar as the other BR options. However, when the cells were combined with a white backsheet in single cell laminates no difference in performance was observed. The ultimate application for a DBR in photovoltaics is thought to be in an ultrathin device in combination with efficient front side trapping. Initial simulations were performed to evaluate and optimize light trapping for a combination of a Mie coating and a DBR. Possible ways for further improvement have been identified.