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Relaxed Current Matching Requirements in Highly Luminescent Perovskite Tandem Solar Cells and Their Fundamental Efficiency Limits.

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Bowman, Alan R 
Lang, Felix 
Chiang, Yu-Hsien 
Jiménez-Solano, Alberto 


Perovskite-based tandem solar cells are of increasing interest as they approach commercialization. Here we use experimental parameters from optical spectroscopy measurements to calculate the limiting efficiency of perovskite-silicon and all-perovskite two-terminal tandems, employing currently available bandgap materials, as 42.0% and 40.8%, respectively. We show luminescence coupling between subcells (the optical transfer of photons from the high-bandgap to low-bandgap subcell) relaxes current matching when the high-bandgap subcell is a luminescent perovskite. We calculate that luminescence coupling becomes important at charge trapping rates (≤106 s-1) already being achieved in relevant halide perovskites. Luminescence coupling increases flexibility in subcell thicknesses and tolerance to different spectral conditions. For maximal benefit, the high-bandgap subcell should have the higher short-circuit current under average spectral conditions. This can be achieved by reducing the bandgap of the high-bandgap subcell, allowing wider, unstable bandgap compositions to be avoided. Lastly, we visualize luminescence coupling in an all-perovskite tandem through cross-section luminescence imaging.



3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences, 3406 Physical Chemistry

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ACS Energy Lett

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American Chemical Society (ACS)
EPSRC (1950589)
Royal Society (UF150033)
European Research Council (756962)
Engineering and Physical Sciences Research Council (EP/R023980/1)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (841386)
Engineering and Physical Sciences Research Council (EP/M005143/1)
Engineering and Physical Sciences Research Council (EP/S030638/1)
EPSRC (EP/T02030X/1)
EPSRC (1948703)
EPSRC (2127077)
ARB acknowledges funding from a Winton Studentship, Oppenheimer Studentship the Engineering and Physical Sciences Research Council (EPSRC) Doctoral Training Centre in Photovoltaics (CDT-PV). ARB thanks Luis Pazos-Outón for supplying data for MAPbI3 solar cells. FL acknowledges financial support from the Alexander Von Humboldt Foundation via the Feodor Lynen program and thanks Prof. Sir R. Friend for supporting his Fellowship at the Cavendish Laboratory. Y-HC acknowledges the funding from Taiwan Cambridge Scholarship. AJ-S gratefully acknowledges a postdoctoral scholarship from the Max Planck Society. KF acknowledges a George and Lilian Schiff Studentship, Winton Studentship, the Engineering and Physical Sciences Research Council (EPSRC) studentship, Cambridge Trust Scholarship, and Robert Gardiner Scholarship. GE was funded by NREL’s LDRD program. ER acknowledges the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (HYPERION, Grant Agreement Number 756962) and the EPSRC for a DTP Part Studentship. MA-J acknowledges funding support from EPSRC through the program grant: EP/M005143/1. MA-J thanks Cambridge Materials Limited for their funding and technical support. MA acknowledges funding from the European Research Council (ERC) (grant agreement No. 756962 [HYPERION]) and the Marie Skłodowska-Curie actions (grant agreement No. 841386) under the European Union’s Horizon 2020 research and innovation programme. BVL acknowledges funding from the Max Planck Society, the Cluster of Excellence e-conversion and the Center for Nanoscience (CeNS). SDS acknowledges the Royal Society and Tata Group (UF150033) and the EPSRC (EP/R023980/1, EP/T02030X/1, EP/S030638/1). We thank Axel Palmstrom and William Nemeth at NREL for depositing some of the layers in the tandem stack.
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