TY - JOUR
T1 - Direct Characterization of Type-I Band Alignment in 2D Ruddlesden–Popper Perovskites
AU - Zhong, Xinjue
AU - Ni, Xiaojuan
AU - Sidhik, Siraj
AU - Li, Hong
AU - Mohite, Aditya D.
AU - Brédas, Jean Luc
AU - Kahn, Antoine
N1 - Funding Information:
Work at Princeton University was supported by the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office (SETO) Award No. DE-EE0008560, and by Grant No. 2018349 from the United States-Israel Binational Science Foundation (BSF). Work at the University of Arizona was supported by the Office of Naval Research under Award No. N00014-22-1-2379 and by the College of Science of the University of Arizona. The computing resources were provided by the Research Data Center at the University of Arizona and by a grant of computer time from the DOD High Performance Computing Modernization Program. The work at Rice University was supported by the DOE-EERE 0008843 program.
Funding Information:
Work at Princeton University was supported by the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office (SETO) Award No. DE‐EE0008560, and by Grant No. 2018349 from the United States‐Israel Binational Science Foundation (BSF). Work at the University of Arizona was supported by the Office of Naval Research under Award No. N00014‐22‐1‐2379 and by the College of Science of the University of Arizona. The computing resources were provided by the Research Data Center at the University of Arizona and by a grant of computer time from the DOD High Performance Computing Modernization Program. The work at Rice University was supported by the DOE‐EERE 0008843 program.
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/12/1
Y1 - 2022/12/1
N2 - 2D Ruddlesden–Popper halide perovskites have attracted considerable attention due to their desirable optoelectronic properties, high chemical and structural tunability, and improved environmental stability. However, the understanding of their structure–properties relationships is still limited. In particular, the energy level positions and band alignments at interfaces involving these materials, which are important features to control in the context of any applications, are still under debate. Here, the electronic structure of high-purity films of BA2MAn−1PbnI3n+1 for n = 1–5 (where BA stands for butylammonium and MA for methylammonium) is investigated, using optical absorption, ultraviolet, and inverse photoemission spectroscopies, and density functional theory calculations. This study determines the ionization energy and electron affinity of each compound and demonstrates a type-I band alignment for the BA2MAn−1PbnI3n+1 series. This study further describes the evolution of the exciton binding energy as a function of the thickness of the inorganic layers.
AB - 2D Ruddlesden–Popper halide perovskites have attracted considerable attention due to their desirable optoelectronic properties, high chemical and structural tunability, and improved environmental stability. However, the understanding of their structure–properties relationships is still limited. In particular, the energy level positions and band alignments at interfaces involving these materials, which are important features to control in the context of any applications, are still under debate. Here, the electronic structure of high-purity films of BA2MAn−1PbnI3n+1 for n = 1–5 (where BA stands for butylammonium and MA for methylammonium) is investigated, using optical absorption, ultraviolet, and inverse photoemission spectroscopies, and density functional theory calculations. This study determines the ionization energy and electron affinity of each compound and demonstrates a type-I band alignment for the BA2MAn−1PbnI3n+1 series. This study further describes the evolution of the exciton binding energy as a function of the thickness of the inorganic layers.
KW - 2D Ruddlesden–Popper perovskites
KW - electronic structures
KW - exciton binding energy
KW - type-I band alignment
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U2 - 10.1002/aenm.202202333
DO - 10.1002/aenm.202202333
M3 - Article
AN - SCOPUS:85139063433
SN - 1614-6832
VL - 12
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 45
M1 - 2202333
ER -