Work

Emissive Surface Traps Lead to Asymmetric Photoluminescence Line Shape in Spheroidal CsPbBr3 Quantum Dots

Year: 2024

Type: preprint

Abstract: The morphology of quantum dots plays an important role in governing their photophysics. Here, we explore the photoluminescence of spheroidal CsPbBr3 quantum dots synthesized via the room-temperature trioctlyphosphine oxide/PbBr2 method. Despite photoluminescence quantum yields nearing 100%, these spheroidal quantum dots exhibit an elongated red photoluminescence tail not observed in typical cubic quantum dots synthesized via hot injection. We explore this elongated red tail through structural and optical characterization including small-angle x-ray scattering, transmission electron microscopy and time-resolved, steady-state, and single quantum dot photoluminescence. From these measurements we conclude that the red tail originates from emissive surface traps. We hypothesize that these emissive surface traps are located on the (111) surfaces and show that the traps can be passivated by adding phenethyl ammonium bromide, resulting in a more symmetric line shape

Source: arXiv (Cornell University)

DOI: 10.13016/m2vdv0-etim

Authors: Kline, Jessica, Gallagher, Shaun, Hammel, Benjamin F., Mathew, Reshma, Ladd, Dylan M., Westbrook, Robert J. E., Pryor, Jalen N., Toney, Michael F., Pelton, Matthew, Yazdi, Sadegh, Dukovic, Gordana, Ginger, David S.

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, University of Washington, Momental Foundation, European Commission, University of Colorado Boulder, Clean Energy Institute, Office of Naval Research, Division of Materials Research

Awards: G1689194922, G2045424223, G2296065515, Graduate Research Fellowship Program (GRFP), G3108985476, G311062248, G3499273409, STC: Center for Integration of Modern Optoelectronic Materials on Demand, G4310665315, G434337789, G471774188, G5214689270, World class Science and Innovation with Neutrons in Europe 2020 – SINE2020, G6271517897, NNCI: Northwest Nanotechnology Infrastructure (NWNI), IMR-MIP DANSE - Distributed Data Analysis for Neutron Scattering Experiments - CNST, G8021483333, G8380713174

OpenAlex ID: W6941341930

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