TY  - JOUR
AU  - Stolterfoht, Martin
AU  - Grischek, Max
AU  - Caprioglio, Pietro
AU  - Wolff, Christian M.
AU  - Gutierrez‐Partida, Emilio
AU  - Peña‐Camargo, Francisco
AU  - Rothhardt, Daniel
AU  - Zhang, Shanshan
AU  - Raoufi, Meysam
AU  - Wolansky, Jakob
AU  - Abdi‐Jalebi, Mojtaba
AU  - Stranks, Samuel D.
AU  - Albrecht, Steve
AU  - Kirchartz, Thomas
AU  - Neher, Dieter
TI  - How To Quantify the Efficiency Potential of Neat Perovskite Films: Perovskite Semiconductors with an Implied Efficiency Exceeding 28%
JO  - Advanced materials
VL  - 32
IS  - 17
SN  - 1521-4095
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2020-01492
SP  - 2000080
PY  - 2020
AB  - Perovskite photovoltaic (PV) cells have demonstrated power conversion efficiencies (PCE) that are close to those of monocrystalline silicon cells; however, in contrast to silicon PV, perovskites are not limited by Auger recombination under 1‐sun illumination. Nevertheless, compared to GaAs and monocrystalline silicon PV, perovskite cells have significantly lower fill factors due to a combination of resistive and non‐radiative recombination losses. This necessitates a deeper understanding of the underlying loss mechanisms and in particular the ideality factor of the cell. By measuring the intensity dependence of the external open‐circuit voltage and the internal quasi‐Fermi level splitting (QFLS), the transport resistance‐free efficiency of the complete cell as well as the efficiency potential of any neat perovskite film with or without attached transport layers are quantified. Moreover, intensity‐dependent QFLS measurements on different perovskite compositions allows for disentangling of the impact of the interfaces and the perovskite surface on the non‐radiative fill factor and open‐circuit voltage loss. It is found that potassium‐passivated triple cation perovskite films stand out by their exceptionally high implied PCEs > 28%, which could be achieved with ideal transport layers. Finally, strategies are presented to reduce both the ideality factor and transport losses to push the efficiency to the thermodynamic limit.
LB  - PUB:(DE-HGF)16
C6  - pmid:32163652
UR  - <Go to ISI:>//WOS:000530300000026
DO  - DOI:10.1002/adma.202000080
UR  - https://juser.fz-juelich.de/record/874536
ER  -