Title: Optically tunable mesoscale CdSe morphologies via inorganic phototropic growth

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.

Authors:

Hamann, Kathryn R.  ^[1];

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• Search OSTI.GOV for ORCID "0000-0003-1163-7173"
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Carim, Azhar I.  ^[1];

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• Search OSTI.GOV for ORCID "0000-0003-3630-6872"
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Meier, Madeline C.  ^[1];

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• Search OSTI.GOV for ORCID "0000-0003-1608-0810"
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Thompson, Jonathan R. ^[1]; Batara, Nicolas A. ^[1]; Yermolenko, Ivan S. ^[2]; Atwater, Harry A. ^[1]; Lewis, Nathan S.  ^[1]

• Search OSTI.GOV for author "Lewis, Nathan S."
• Search OSTI.GOV for ORCID "0000-0001-5245-0538"
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+ Show Author Affiliations

1. California Institute of Technology (CalTech), Pasadena, CA (United States)
2. Bruker Corporation, San Jose, CA (United States)

Publication Date:

Mon Jun 22 00:00:00 EDT 2020

Research Org.:

California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

OSTI Identifier:

1801469

Alternate Identifier(s):

OSTI ID: 1637382

Grant/Contract Number:  

SC0001293; DMR-1905963

Resource Type:

Journal Article: Accepted Manuscript

Journal Name:

Journal of Materials Chemistry C

Additional Journal Information:

Journal Volume: 8; Journal Issue: 36; Journal ID: ISSN 2050-7526

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; Materials Science; Physics