Cell to module gains for high efficiency back contact cells
Energieonderzoek Centrum Nederland
Back contact cells architectures, especially Interdigitated Back Contact (IBC), offer the potential for the highest efficiencies, best aesthetics, and application flexibility. Foil-based back contact module interconnect for these architectures has been shown to be a high throughput, industrially viable, and reliable solution for both IBC and Metal Wrap Through (MWT) cells. By collecting current from distributed points on the cell, foil reduces series resistance in the module interconnection, leading to lower cell-to-module (CTM) FF loss. This specific feature makes the conductive foil the interconnection technology of choice for high current back contact solar cells. In addition, the capacity of the conductive foil to tolerate higher Isc in the module with limited series resistance increase offers the opportunity to further improve module power based on light management techniques and increase of the module Isc. In this work, we focused on increasing the CTM Isc and power gains by improving capture of the light inside the module by using a reflective “Intra-Module” Foil (IMF) placed in between back contact cells interconnected with back contact foil. We present results on single-cell and 2x2 back contact laminates manufactured with IBC and MWT cells interconnected based on ECN’s conductive foil technology. CTM power gain above 5.1% is demonstrated with Isc gain more than above 8% on 2x2 laminates.
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EUPVSEC, Amsterdam, 25-29 september 2017.