Journal
ACS PHOTONICS
Volume 5, Issue 6, Pages 2243-2250Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00099
Keywords
photovoltaics; light trapping; light management; perovskite; light harvesting
Categories
Funding
- Spanish MINECO (Severo Ochoa program) [SEV-2015-0522]
- MINECO
- Fondo Europeo de Desarrollo Regional FEDER [MAT2014-52985-R]
- Fundacio Privada Cellex
- EC FP7 Program [ICT-2011.35, NMP3-SL-2013-604506]
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As the efficiency of a solar cell approaches its limits, photonic considerations to further enhance its performance overtake electronic ones. It has been theoretically shown for GaAs solar cells that with the combined effects of a surface random texturing and a perfectly reflecting rear mirror, efficiencies close to the Shockley Queisser limit can be reached, even when the absorber layer is very thin. In here, we demonstrate a method for taking advantage of surface random texturing to enhance the efficiency of planar perovskite solar cells. By naturally transferring the perovskite random nano texturing to the back semiconductor/metal interface, where the contrast in the imaginary part of the refractive index is very large, backscattering reduces light escape from the solar cell structure. This leads to a close to optimal light absorption that allows bringing the cell efficiency from 19.3% to 19.8%. Such a path we opened toward an ergodic behavior for maximum light absorption in perovskite cells may lead to the most efficient perovskite cells ever.
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