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Record Open‐Circuit Voltage Wide‐Bandgap Perovskite Solar Cells Utilizing 2D/3D Perovskite Heterostructure
Author(s) -
Gharibzadeh Saba,
Abdollahi Nejand Bahram,
Jakoby Marius,
Abzieher Tobias,
Hauschild Dirk,
Moghadamzadeh Somayeh,
Schwenzer Jonas A.,
Brenner Philipp,
Schmager Raphael,
Haghighirad Amir Abbas,
Weinhardt Lothar,
Lemmer Uli,
Richards Bryce S.,
Howard Ian A.,
Paetzold Ulrich W.
Publication year - 2019
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.201803699
Subject(s) - perovskite (structure) , materials science , band gap , heterojunction , optoelectronics , photovoltaics , open circuit voltage , energy conversion efficiency , hybrid solar cell , layer (electronics) , thin film , photovoltaic system , nanotechnology , voltage , chemical engineering , polymer solar cell , electrical engineering , engineering
In this work, the authors realize stable and highly efficient wide‐bandgap perovskite solar cells that promise high power conversion efficiencies (PCE) and are likely to play a key role in next generation multi‐junction photovoltaics (PV). This work reports on wide‐bandgap (≈1.72 eV) perovskite solar cells exhibiting stable PCEs of up to 19.4% and a remarkably high open‐circuit voltage ( V OC ) of 1.31 V. The V OC ‐to‐bandgap ratio is the highest reported for wide‐bandgap organic−inorganic hybrid perovskite solar cells and the V OC also exceeds 90% of the theoretical maximum, defined by the Shockley–Queisser limit. This advance is based on creating a hybrid 2D/3D perovskite heterostructure. By spin coating n ‐butylammonium bromide on the double‐cation perovskite absorber layer, a thin 2D Ruddlesden–Popper perovskite layer of intermediate phases is formed, which mitigates nonradiative recombination in the perovskite absorber layer. As a result, V OC is enhanced by 80 mV.