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ECN publication
Light Trapping Film for Bifacial Applications
Aken, B.B. van; Roosmalen, J.A.M. van; Okel, L.A.G.; Romijn, I.G.; Janssen, G.J.M.; Mrcarica, M.; Du-Mong, K.; Rooijmans, M.; Panofen, C.
Published by: Publication date:
ECN Solar Energy 14-9-2015
ECN report number: Document type:
ECN-M--15-013 Conference Paper
Number of pages: Full text:
4 Download PDF  

DSM’s light trapping film (LTF) is applied to bifacial modules to improve the energy yield for vertical, east/west facing applications. The LTF increases the current both at test conditions (STC) and under high albedo with about 4% compared to planar solar glass, due to the better anti-reflection (AR) and light trapping properties. Without LTF, the current drop due to reflection at the air/glass interface increases from 4% to 45% for incident angles between 0 and 85°, With LTF it remains between 1 and 4%, coupling almost all light at all angles into the module. Optical, thermal and electrical modelling together with time resolved meteorological data results in time resolved output power. This shows that for east/west facing vertical modules 60% of the calculated energy output is generated at incidence angle >55°, versus 20% for equator-facing modules. Applying the annual energy yield (AEY) model to bifacial modules in vertical applications, we show that there is >6% gain in AEY by the addition of LTF. In general, as LTF is most effective for light incident at higher angles, systems that have a large contribution from either (or both) diffuse or ground reflected light will benefit the most from addition of LTF.

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