Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201900463
Keywords
light trapping; low-bandgap nonfullerene acceptor thin-film solar cells; optical cavity; ternary blends
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Funding
- Spanish Ministry of Economy and Competitiveness (MINECO) through the Severo Ochoa program for Centres of Excellence in RD [SEV-2015-0522]
- Fundacio Privada Cellex
- Generalitat de Catalunya through the CERCA program
- MINECO [MAT2017-89522-R, CTQ2016-81911-REDT]
- NSFC [21734001]
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In the subwavelength regime, several nanophotonic configurations have been proposed to overcome the conventional light trapping or light absorption enhancement limit in solar cells also known as the Yablonovitch limit. It has been recently suggested that establishing such limit should rely on computational inverse electromagnetic design instead of the traditional approach combining intuition and a priori known physical effect. In the present work, by applying an inverse full wave vector electromagnetic computational approach, a 1D nanostructured optical cavity with a new resonance configuration is designed that provides an ultrabroadband (approximate to 450 nm) light absorption enhancement when applied to a 107 nm thick active layer organic solar cell based on a low-bandgap (1.32 eV) nonfullerene acceptor. It is demonstrated computationally and experimentally that the absorption enhancement provided by such a cavity surpasses the conventional limit resulting from an ergodic optical geometry by a 7% average over a 450 nm band and by more than 20% in the NIR. In such a cavity configuration the solar cells exhibit a maximum power conversion efficiency above 14%, corresponding to the highest ever measured for devices based on the specific nonfullerene acceptor used.
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