Dynamic Evolution of 2D Layers within Perovskite Nanocrystals via Salt Pair Extraction and Reinsertion

Wheeler, Lance M.; Anderson, Nicholas C.; Bliss, Taylor S.; Hautzinger, Matthew P.; Neale, Nathan R.

doi:10.1021/acs.jpcc.8b01164

Title: Dynamic Evolution of 2D Layers within Perovskite Nanocrystals via Salt Pair Extraction and Reinsertion

Journal Article · 28 April 2018 · Journal of Physical Chemistry. C

DOI: https://doi.org/10.1021/acs.jpcc.8b01164 · OSTI ID:1456865

Wheeler, Lance M. ^[1]; Anderson, Nicholas C. ^[1]; Bliss, Taylor S. ^[2];

^[3];

^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Florida, Gainesville, FL (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Southern Illinois, Carbondale, IL (United States)

Metal halide perovskite (MHP) semiconductors exhibit unprecedented optoelectronic properties coupled with low formation energies that enable scalable, cost-efficient solution processing. The low formation energies additionally facilitate dynamic transformation of the chemical composition and crystal structure of the MHP material. In this work, we show that CsBr salt is selectively extracted from CsPbBr₃ nanocrystals (NCs) to yield PbBr₂ NCs. The PbBr₂ NCs are then exposed to different glacial acetic acid ABr salt solutions to generate a variety of emissive compounds with the generic structure A'₂A_n-1Pb_nBr₃_n-1X'₂, where A = cesium (Cs⁺), methylammonium (MA⁺), formamidinium (FA+); A' = A or H+; X' = Br- or acetate (CH3COO-); and n is the number of lead halide layers, where n = 1, 2, 3, ...8. We systematically vary the ratios of PbBr₂/ABr/CH₃COOH and show that certain ratios result in isolable single-phase APbBr3 NCs - an effective A-site cation exchange from the parent CsPbBr₃ NCs. Importantly, time-resolved photoluminescence (PL) spectroscopy shows the dynamic evolution of many additional species as evidenced by blue-shifted emission peaks from 2.85-2.49 eV for MA⁺-based structures. We assign these species to n = 1, 2, 3, 4, and 5 quasi-two-dimensional network (2DN) sheets, in which CH₃COO- anions and Br- anions compete for the c-axis X' sites separating haloplumbate(II) layers within the A'₂A_n-1Pb_nBr_3n-1X'₂ NCs. Finally, we demonstrate the degree of CH₃COO- incorporation, and thus the 2DN layer thickness and PL energy, is controlled in the early reaction times by kinetic factors. After a longer time (3 h), thermodynamic forces dictated by Le Chatelier's principle tune the structure in A'₂A_n-1Pb_nBr_3n-1X'₂ NCs from exclusively n = 1 to n = 8 depending on the PbBr₂/ABr/CH₃COOH ratio.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1456865

Report Number(s):: NREL/JA-5900-70903

Journal Information:: Journal of Physical Chemistry. C, Vol. 122, Issue 25; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Related Subjects

14 SOLAR ENERGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
layered perovskite
perovskite nanocrystal
two-dimensional semiconductors
two-dimensional network
cation exchange
quantum confinement