Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 136, Issue -, Pages 127-134Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2014.12.023
Keywords
Upconversion; Silicon solar cells; 3rd Generation photovoltaics; Broad-band excitation; Quantum yield; Erbium
Funding
- European Community [246200]
- German Federal Ministry of Education and Research in the Project InfraVolt - Infrarot-Optische Nanostrukturen fur die Photovoltiak (BMBF) [03SF0401B]
- Project Increased solar energy conversion ACES of Fondazione Pisa [183/2011]
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In this paper, we investigate Er3+-doped monocrystalline BaY2F8 as an upconverter material for crystalline silicon solar cells with the aim of making use of previously not-utilized sub-bandgap photons. Monocrystalline samples with 10%, 20% and 30% Er3+ doping were grown in a Czochralski furnace and subsequently attached to an adapted planar bifacial silicon solar cell with a 33.4 mA/cm(2) short-circuit current density under one-sun AM1.5G standard measurement conditions. Optical characterization revealed that for the investigated illumination conditions the 30% Er3+-doped samples showed the most promising properties, with a very high peak absorption coefficient of 45.1 cm(-1) at 1493 nm and a high external (internal) upconversion quantum yield of 9.5 +/- 0.7% (10.1 +/- 1.6%) under 4740 +/- 250W m(-2) monochromatic irradiation at 1520 nm. Solar simulator measurements of the upconverter solar cell device using the BaY2F8:30% Er3+ sample showed an additional short-circuit current density due to upconversion Delta j(SC,UC) of 17.2 +/- 3.0 mA/cm(2) at an illumination with a solar concentration of 94 +/- 17 suns, equivalent to a record relative enhancement of the short-circuit current of 0.55 +/- 0.14%. This value constitutes to our knowledge more than a doubling compared to the previously highest published values and more than a 35-fold increase compared to values published three years ago. (C) 2015 Published by Elsevier B.V.
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