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Optically tunable mesoscale CdSe morphologies via inorganic phototropic growth

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Abstract

Inorganic phototropic growth using only spatially conformal illumination generated Se–Cd films that exhibited precise light-defined mesoscale morphologies including highly ordered, anisotropic, and periodic ridge and trench nanotextures over entire macroscopic substrates. Growth was accomplished via a light-induced electrochemical method using an optically and chemically isotropic solution, an unpatterned substrate, and unstructured, incoherent, low-intensity illumination in the absence of chemical directing agents or physical templates and masks. The morphologies were defined by the illumination inputs: the nanotexture long axes aligned parallel to the optical E-field vector, and the feature sizes and periods scaled with the wavelength. Optically based modeling of the growth closely reproduced the experimental results, confirming the film morphologies were fully determined by the light–matter interactions during growth. Solution processing of the Se–Cd films resulted in stoichiometric, crystalline CdSe films that also exhibited ordered nanotextures, demonstrating that inorganic phototropic growth can effect tunable, template-free generation of ordered CdSe nanostructures over macroscopic length scales.

Graphical abstract: Optically tunable mesoscale CdSe morphologies via inorganic phototropic growth

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Article information


Submitted
01 May 2020
Accepted
22 Jun 2020
First published
22 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Communication

Optically tunable mesoscale CdSe morphologies via inorganic phototropic growth

K. R. Hamann, A. I. Carim, M. C. Meier, J. R. Thompson, N. A. Batara, I. S. Yermolenko, H. A. Atwater and N. S. Lewis, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC02126A

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