@article{55a7c0d255e1405f8e37916bf72416d3,
title = "Scaling law for excitons in 2D perovskite quantum wells",
abstract = "Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula A2A' n-1M n X3n+1, where optoelectronic properties can be tuned by varying the perovskite layer thickness (n-value), and have recently emerged as efficient semiconductors with technologically relevant stability. However, fundamental questions concerning the nature of optical resonances (excitons or free carriers) and the exciton reduced mass, and their scaling with quantum well thickness, which are critical for designing efficient optoelectronic devices, remain unresolved. Here, using optical spectroscopy and 60-Tesla magneto-absorption supported by modeling, we unambiguously demonstrate that the optical resonances arise from tightly bound excitons with both exciton reduced masses and binding energies decreasing, respectively, from 0.221 m 0 to 0.186 m 0 and from 470 meV to 125 meV with increasing thickness from n equals 1 to 5. Based on this study we propose a general scaling law to determine the binding energy of excitons in perovskite quantum wells of any layer thickness.",
author = "Blancon, {J. C.} and Stier, {A. V.} and H. Tsai and W. Nie and Stoumpos, {C. C.} and B. Traor{\'e} and L. Pedesseau and M. Kepenekian and F. Katsutani and Noe, {G. T.} and J. Kono and S. Tretiak and Crooker, {S. A.} and C. Katan and Kanatzidis, {M. G.} and Crochet, {J. J.} and J. Even and Mohite, {A. D.}",
note = "Funding Information: The work at Los Alamos National Laboratory (LANL) was supported by LDRD program (to J.-C.B., W.N., S.T., A.D.M.) and was partially performed at the Center for Nonlinear Studies. J.-C.B. and A.D.M. acknowledge support from the DOE (EERE 1647-1544). Funding Information: The work at Los Alamos National Laboratory (LANL) was supported by LDRD program (to J.-C.B., W.N., S.T., A.D.M.) and was partially performed at the Center for Nonlinear Studies. J.-C.B. and A.D.M. acknowledge support from the DOE (EERE 1647-1544). The work was conducted, in part, at the Center for Integrated Nanotechnologies (CINT), a U. S. Department of Energy, Office of Science user facility. Part of this work was performed at the National High Magnetic Field Laboratory, which is supported by NSF DMR-1157490, NSF DMR-1644779 and the State of Florida. S.A.C. acknowledges support from the DOE Basic Energy Sciences “Science of 100 T” program. Work at Northwestern University was supported by ONR grant N00014-17-1-2231. The work in France was supported by Agence Nationale pour la Recherche (TRANSHYPERO project). This work was granted access to the HPC resources of (TGCC/CINES/IDRIS) under the allocation 2017-A0010907682 made by GENCI. The work at Rice University (to F.K., G.T.N., J.K.) was supported by the NSF (Grant No. DMR-1310138), the Robert A. Welch Foundation (Grant No. C-1509) and the Air Force Office of Science Research (Grant No. FA9550-14-1-0268). Publisher Copyright: {\textcopyright} 2018 The Author(s).",
year = "2018",
month = dec,
day = "1",
doi = "10.1038/s41467-018-04659-x",
language = "English",
volume = "9",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}