Abstract
The 2D Ruddlesden-Popper (RP) perovskites Cs2PbI2Cl2 (Pb-based, n = 1) and Cs2SnI2Cl2 (Sn-based, n = 1) stand out as unique and rare instances of entirely inorganic constituents within the more expansive category of organic/inorganic 2D perovskites. These materials have recently garnered significant attention for their strong UV-light responsiveness, exceptional thermal stability, and theoretically predicted ultrahigh carrier mobility. In this study, we synthesized Pb and Sn-based n = 1 2D RP perovskite films covering millimeter-scale areas for the first time, utilizing a one-step chemical vapor deposition (CVD) method under atmospheric conditions. These films feature perovskite layers oriented horizontally relative to the substrate. Multilayered Cs3Pb2I3Cl4 (Pb-based, n = 2) and Cs3Sn2I3Cl4 (Sn-based, n = 2) films were also obtained for the first time, and their crystallographic structures were refined by combining X-ray diffraction (XRD) and density functional theory (DFT) calculations. DFT calculations and experimental optical spectroscopy support band-gap energy shifts related to the perovskite layer thickness. We demonstrate bias-free photodetectors using the Sn-based, n = 1 perovskite with reproducible photocurrent and a fast 84 ms response time. The present work not only demonstrates the growth of high-quality all-inorganic multilayered 2D perovskites via the CVD method but also suggests their potential as promising candidates for future optoelectronic applications.
Original language | English (US) |
---|---|
Pages (from-to) | 46560-46569 |
Number of pages | 10 |
Journal | ACS Applied Materials and Interfaces |
Volume | 16 |
Issue number | 35 |
DOIs | |
State | Published - Sep 4 2024 |
Funding
A.D.M. and X.S. acknowledge research support from the HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office, under the Award No. DE-EE0008843. J.H. acknowledges the financial support from the China Scholarships Council (No. 202107990007). The work at ISCR and FOTON was supported by the European Union\u2019s Horizon 2020 Research and Innovation Program, under Grant Agreement No. 861985 (PeroCUBE). J.E. acknowledges the financial support from the Institut Universitaire de France. This work was granted access to the HPC resources of TGCC/CINES under Allocation No. A0140911434 made by GENCI. At Northwestern, this work was supported by the Office of Naval Research (ONR), under Grant No. N00014-20-1-2725. The authors acknowledge the support from Esther Tsai for her assistance in performing GIWAXS measurements at the BNL beamline.
Keywords
- 2D perovskites
- CVD
- all-inorganic perovskites
- photodetector
- tin-based perovskites
ASJC Scopus subject areas
- General Materials Science