Alteration of the Optoelectronic Properties of CuInS2 Quantum Dots via Colloidal Annealing
Dehm K, Zanetti A, Fett B, Mauritz V, Hamburger RC, Langford D, Guldi DM, Young ER, Mandel K, Crisp R (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Abstract
Colloidal semiconductor quantum dots (QDs) have tunable optoelectronic properties, thereby making them interesting materials for applications involving light-matter interactions. However, crystallographic and surface defects greatly impair their potential performance in devices. Herein, we present a straightforward approach to improve the quality of copper indium disulfide (CuInS2) QDs by adjusting the parameters of the colloidal synthesis. By the introduction of prolonged heating times after the nanocrystal growth has already gone to completion, defect states are partially removed. This “colloidal annealing” for varying time spans (from 5 up to 90 min) with longer annealing times correlating with a decreased ratio of emission from defect states compared to band edge emission, results in enhanced color purity. At shorter annealing times, the defects removed are mainly structural, indicated by the transition from mixed crystal phases to an almost phase-pure material. At longer annealing times, further improvements are linked to surface defect removal. Findings from transient absorption spectroscopy further confirm this trend by revealing a decrease in the intensity of a photoinduced absorption feature associated with sub-band gap states compared to the band edge bleach signal. These findings highlight the applicability of colloidal annealing as a straightforward strategy for direct material optimization during colloidal synthesis.
Authors with CRIS profile
Katharina Dehm
Lehrstuhl für Chemistry of thin film materials
Alberto Zanetti
Lehrstuhl für Chemistry of thin film materials
Bastian Fett
Professur für Anorganische Chemie
Vincent Mauritz
Lehrstuhl für Chemistry of thin film materials
Daniel Langford
Lehrstuhl für Physikalische Chemie I
Dirk Michael Guldi
Lehrstuhl für Physikalische Chemie I
Karl Mandel
Professur für Anorganische Chemie
Ryan Crisp
Lehrstuhl für Chemistry of thin film materials
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United States (USA) (US)How to cite
APA:
Dehm, K., Zanetti, A., Fett, B., Mauritz, V., Hamburger, R.C., Langford, D.,... Crisp, R. (2024). Alteration of the Optoelectronic Properties of CuInS2 Quantum Dots via Colloidal Annealing. Crystal Growth and Design. https://doi.org/10.1021/acs.cgd.4c00150
MLA:
Dehm, Katharina, et al. "Alteration of the Optoelectronic Properties of CuInS2 Quantum Dots via Colloidal Annealing." Crystal Growth and Design (2024).
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