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Edge-Illuminated Ultrathin Crystalline Silicon Solar Cell
T. Markvart, L. Danos
Wafer-Based Silicon Solar Cells and Materials Technology
Subtopic: Mono- and Multicrystalline Silicon Materials and Cells
Event: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain
Session: 2DV.1.89
2692 - 2693
ISBN: 3-936338-26-4
Paper DOI: 10.4229/25thEUPVSEC2010-2DV.1.89
0,00 EUR
Document(s): paper


This paper proposes a radically new solution to enhance the photoexcitation of silicon by directing the illumination onto the edge of the solar cell by means of fluorescence energy collection. This approach makes it possible to consider photovoltaic devices with efficiencies comparable to crystalline silicon thickness of only several micrometers. We will present the first theoretical results and discuss such structures where the path length of light is increased substantially, leading to efficient capture of the near bandgap photon flux. We shall show that using a realistic model for the fluorescent collector, overall device efficiency (collector + solar cell) of 13% maybe be achievable in the near future with a 1μm thick silicon structure. Efficiencies in excess of 17% can be reached with the application of photonics or using thicker silicon layers. We demonstrate that edge illuminated ultrathin silicon solar cells using fluorescent collectors can produce conversion efficiencies close to conventional c-Si solar cell but with greatly reduced material requirements.