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

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Florida, Gainesville, FL (United States)
  3. 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'2An-1PbnBr3n-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'2An-1PbnBr3n-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'2An-1PbnBr3n-1X'2 NCs from exclusively n = 1 to n = 8 depending on the PbBr2/ABr/CH3COOH ratio.

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
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (2)

Metal halide perovskite nanostructures for optoelectronic applications and the study of physical properties journal February 2019
Tailoring the luminescence of atomic clusters via ligand exchange reaction mediated post synthetic modification journal January 2020

Figures / Tables (5)