@article{c404b51da6994b8cb19e8686ca2e1833,
title = "Atomically Resolved Quantum-Confined Electronic Structures at Organic-Inorganic Interfaces of Two-Dimensional Ruddlesden-Popper Halide Perovskites",
abstract = "This work demonstrates the direct visualization of atomically resolved quantum-confined electronic structures at organic-inorganic heterointerfaces of two-dimensional (2D) organic-inorganic hybrid Ruddlesden-Popper perovskites (RPPs); this is accomplished with scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) by using solvent engineering to prepare perpendicularly oriented 2D RPPs. Atomically resolved band mapping images across the organic-inorganic interfaces of 2D RPPs yield typical quantum-well-like type-I heterojunction band alignment with band gaps depending on the thicknesses or n values of the inorganic perovskite slabs. The presence of edge states within the band gap due to organic cation vacancies is also observed. In addition, real-space visualization of atomic-scale structural phase transition behavior and changes in local electronic band structures are obtained simultaneously. Our results provide an unequivocal observation and explanation of the quantum-confined electronic structures formed at organic-inorganic interfaces of 2D RPPs. ",
keywords = "organic-inorganic interface, quantum-well electronic structure, scanning tunneling microscopy, two-dimensional perovskites",
author = "Shih, {Min Chuan} and Hsu, {Hung Chang} and Lin, {Cheng Chieh} and Huang, {Shao Ku} and Chen, {Tzu Pei} and Tsai, {Yung Han} and Chen, {Chia Chun} and Chiu, {Ya Ping} and Chen, {Chun Wei}",
note = "Funding Information: C.-W.C. acknowledges the financial support from the Ministry of Science and Technology (MOST), Taiwan (grant no. 108-2923-M-002-002-MY2, MOST-NIMS add-on project). Y.-P.C. acknowledges the financial support from the Ministry of Science and Technology (MOST), Taiwan (contract no. MOST 109-2628-M-002-005-MY3) and National Taiwan University (contract no. NTU-109L7848). Financial support by the Center of Atomic Initiative for New Materials (AI-Mat), National Taiwan University, from the Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education in Taiwan (grant no. 108L9008) is also acknowledged. Publisher Copyright: {\textcopyright} 2021 The Authors. Published by American Chemical Society.",
year = "2021",
month = oct,
day = "13",
doi = "10.1021/acs.nanolett.1c02409",
language = "English",
volume = "21",
pages = "8066--8072",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "19",
}