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Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells
Author(s) -
Warby Jonathan,
Zu Fengshuo,
Zeiske Stefan,
GutierrezPartida Emilio,
Frohloff Lennart,
Kahmann Simon,
Frohna Kyle,
Mosconi Edoardo,
Radicchi Eros,
Lang Felix,
Shah Sahil,
PeñaCamargo Francisco,
Hempel Hannes,
Unold Thomas,
Koch Norbert,
Armin Ardalan,
De Angelis Filippo,
Stranks Samuel D.,
Neher Dieter,
Stolterfoht Martin
Publication year - 2022
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202103567
Subject(s) - perovskite (structure) , materials science , recombination , monolayer , photovoltaic system , optoelectronics , photoluminescence , perovskite solar cell , x ray photoelectron spectroscopy , spontaneous emission , layer (electronics) , semiconductor , work (physics) , silicon , chemical physics , nanotechnology , solar cell , chemical engineering , optics , thermodynamics , physics , chemistry , ecology , laser , biochemistry , biology , engineering , gene
Perovskite semiconductors are an attractive option to overcome the limitations of established silicon based photovoltaic (PV) technologies due to their exceptional opto‐electronic properties and their successful integration into multijunction cells. However, the performance of single‐ and multijunction cells is largely limited by significant nonradiative recombination at the perovskite/organic electron transport layer junctions. In this work, the cause of interfacial recombination at the perovskite/C 60 interface is revealed via a combination of photoluminescence, photoelectron spectroscopy, and first‐principle numerical simulations. It is found that the most significant contribution to the total C 60 ‐induced recombination loss occurs within the first monolayer of C 60 , rather than in the bulk of C 60 or at the perovskite surface. The experiments show that the C 60 molecules act as deep trap states when in direct contact with the perovskite. It is further demonstrated that by reducing the surface coverage of C 60 , the radiative efficiency of the bare perovskite layer can be retained. The findings of this work pave the way toward overcoming one of the most critical remaining performance losses in perovskite solar cells.