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Title: High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays

Abstract

We describe here the fabrication and use of arrays of TiO2 nanocones to yield high optical transmission into semiconductor photoelectrodes covered with high surface loadings of light-absorbing electrocatalysts. Covering over 50% of the surface of a light absorber with an array of high-refractive-index TiO2 nanocones imparted antireflective behavior (<5% reflectance) to the surface and allowed >85% transmission of broadband light to the underlying Si, even when thick metal contacts or opaque catalyst coatings were deposited on areas of the light-facing surface that were not directly beneath a nanocone. Three-dimensional full-field electromagnetic simulations for the 400–1100 nm spectral range demonstrated that incident broadband illumination couples to multiple waveguide modes in the TiO2 nanocones, reducing interactions of the light with the metal layer. A proof-of-concept experimental demonstration of light-driven water oxidation was performed using a p+n-Si photoanode decorated with an array of TiO2 nanocones additionally having a Ni catalyst layer electrodeposited onto the areas of the p+n-Si surface left uncovered by the TiO2 nanocones. This photoanode produced a light-limited photocurrent density of ~28 mA cm–2 under 100 mW cm–2 of simulated air mass 1.5 illumination, equivalent to the photocurrent density expected for a bare planar Si surface even though 54% of themore » front surface of the Si was covered by an ~70 nm thick Ni metal layer« less

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
  2. NGNext, Redondo Beach, CA (United States)
Publication Date:
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:
1633778
Grant/Contract Number:  
SC0004993; EEC-1041895
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 20; Journal Issue: 1; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Dielectric nanocone; broadband transmission; nanophotonic; optoelectronic; photoelectrochemical; photovoltaic

Citation Formats

Yalamanchili, Sisir, Verlage, Erik, Cheng, Wen-Hui, Fountaine, Katherine T., Jahelka, Philip R., Kempler, Paul A., Saive, Rebecca, Lewis, Nathan S., and Atwater, Harry A. High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.nanolett.9b04225.
Yalamanchili, Sisir, Verlage, Erik, Cheng, Wen-Hui, Fountaine, Katherine T., Jahelka, Philip R., Kempler, Paul A., Saive, Rebecca, Lewis, Nathan S., & Atwater, Harry A. High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays. United States. https://doi.org/10.1021/acs.nanolett.9b04225
Yalamanchili, Sisir, Verlage, Erik, Cheng, Wen-Hui, Fountaine, Katherine T., Jahelka, Philip R., Kempler, Paul A., Saive, Rebecca, Lewis, Nathan S., and Atwater, Harry A. Tue . "High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays". United States. https://doi.org/10.1021/acs.nanolett.9b04225. https://www.osti.gov/servlets/purl/1633778.
@article{osti_1633778,
title = {High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays},
author = {Yalamanchili, Sisir and Verlage, Erik and Cheng, Wen-Hui and Fountaine, Katherine T. and Jahelka, Philip R. and Kempler, Paul A. and Saive, Rebecca and Lewis, Nathan S. and Atwater, Harry A.},
abstractNote = {We describe here the fabrication and use of arrays of TiO2 nanocones to yield high optical transmission into semiconductor photoelectrodes covered with high surface loadings of light-absorbing electrocatalysts. Covering over 50% of the surface of a light absorber with an array of high-refractive-index TiO2 nanocones imparted antireflective behavior (<5% reflectance) to the surface and allowed >85% transmission of broadband light to the underlying Si, even when thick metal contacts or opaque catalyst coatings were deposited on areas of the light-facing surface that were not directly beneath a nanocone. Three-dimensional full-field electromagnetic simulations for the 400–1100 nm spectral range demonstrated that incident broadband illumination couples to multiple waveguide modes in the TiO2 nanocones, reducing interactions of the light with the metal layer. A proof-of-concept experimental demonstration of light-driven water oxidation was performed using a p+n-Si photoanode decorated with an array of TiO2 nanocones additionally having a Ni catalyst layer electrodeposited onto the areas of the p+n-Si surface left uncovered by the TiO2 nanocones. This photoanode produced a light-limited photocurrent density of ~28 mA cm–2 under 100 mW cm–2 of simulated air mass 1.5 illumination, equivalent to the photocurrent density expected for a bare planar Si surface even though 54% of the front surface of the Si was covered by an ~70 nm thick Ni metal layer},
doi = {10.1021/acs.nanolett.9b04225},
journal = {Nano Letters},
number = 1,
volume = 20,
place = {United States},
year = {2019},
month = {12}
}

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