Silicon Nanoparticle Films Infilled with Al2O3 Using Atomic Layer Deposition for Photosensor, Light Emission, and Photovoltaic Applications
authors Botas, AMP; Leitao, JP; Falcao, BP; Wiesinger, M; Eckmann, F; Teixeira, JP; Wiggers, H; Stutzmann, M; Ferreira, RAS; Pereira, RN
nationality International
journal ACS APPLIED NANO MATERIALS
author keywords silicon nanocrystal films; atomic layer deposition infilling; air stability; photoluminescence properties; dielectric confinement
keywords FIELD-EFFECT TRANSISTORS; ELECTRONIC STATES; PLASMA SYNTHESIS; QUANTUM DOTS; SOLAR-CELLS; NANOCRYSTALS; DEPENDENCE; PROSPECTS
abstract Solution-processed thin films of crystalline silicon nanoparticles (Si NPs) have a great potential for a wide variety of electronic and optoelectronic applications. However, such films are inherently unstable due to their huge surface-to-volume ratios and high surface energies, making them prone to degradation associated with spontaneous oxidation in ambient conditions. In this work, we explore the use of atomic layer deposition (ALD) as a means to stabilize and potentially functionalize solution-processed thin films of Si NPs for (opto)electronics, e.g., thin-film transistors, photosensors, light-emitting devices, and photovoltaics. We prepared films of randomly distributed Si NPs with ultrashort surface ligands (Si-H termination) using wet chemistry and spray-coating and then use ALD to infill the films with Al2O3. Through microscopy and optical structural/morphological analysis, we demonstrate the achievability of ALD infilling of films of Si NPs and probe the stability of these films against oxidation. Moreover, we show that the ALD infilling leads to changes in the light emission properties of the Si NP films, including a relative quenching of disorder-related emission features and variations in surface-related dielectric confinement effects. Our studies reveal ALD as a relevant technique toward manufacturing de facto robust, functional nanomaterials based on Si NPs and on nanoscale silicon materials more generally.
publisher AMER CHEMICAL SOC
issn 2574-0970
year published 2020
volume 3
issue 6
beginning page 5033
ending page 5044
digital object identifier (doi) 10.1021/acsanm.0c00116
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000545689000013

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