SILICON SOLAR CELLS ON ULTRA-THIN SUBSTRATES FOR LARGE SCALE PRODUCTION

摘要

The current industrial process, based on screen printed, full coverage aluminum paste on the rear surface shows clear limitations on wafers thinner than 200μm, due to wafer warping and decreasing cell performance. In this work we demonstrate the possibility to transfer into production an innovative process for large area silicon solar cells on 100 μm substrates. The main characteristics of this process are: an easy and straightforward way of manufacturing solar cells with a well passivated rear surface and local contacts, a great deal of integration with the existing industrial process, the compatibility with screen printed technology, the introduction of novel dry processing techniques and ultimately the potential to increase industrial solar cells efficiency on thinner substrates.