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

Sisir Yalamanchili, Erik Verlage, Wen Hui Cheng, Katherine T. Fountaine, Philip R. Jahelka, Paul A. Kempler, Rebecca Saive, Nathan S. Lewis*, Harry A. Atwater

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We describe 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 showed 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.

Original languageEnglish
Pages (from-to)502-508
JournalNano letters
Volume20
Issue number1
DOIs
Publication statusPublished - 8 Jan 2020
Externally publishedYes

Fingerprint

fuel production
Dielectric waveguides
dielectric waveguides
light transmission
Optical waveguides
Light transmission
optical waveguides
broadband
Metals
Photocurrents
photocurrents
Lighting
illumination
metals
catalysts
Facings
Catalysts
electrocatalysts
Electrocatalysts
air masses

Keywords

  • Broadband transmission
  • Dielectric nanocone
  • Nanophotonic
  • Optoelectronic
  • Photoelectrochemical
  • Photovoltaic

Cite this

Yalamanchili, S., Verlage, E., Cheng, W. H., Fountaine, K. T., Jahelka, P. R., Kempler, P. A., ... Atwater, H. A. (2020). High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays. Nano letters, 20(1), 502-508. 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. In: Nano letters. 2020 ; Vol. 20, No. 1. pp. 502-508.
@article{a7b48f3591624640bc94ae17235869c4,
title = "High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays",
abstract = "We describe 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 showed 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.",
keywords = "Broadband transmission, Dielectric nanocone, Nanophotonic, Optoelectronic, Photoelectrochemical, Photovoltaic",
author = "Sisir Yalamanchili and Erik Verlage and Cheng, {Wen Hui} and Fountaine, {Katherine T.} and Jahelka, {Philip R.} and Kempler, {Paul A.} and Rebecca Saive and Lewis, {Nathan S.} and Atwater, {Harry A.}",
year = "2020",
month = "1",
day = "8",
doi = "10.1021/acs.nanolett.9b04225",
language = "English",
volume = "20",
pages = "502--508",
journal = "Nano letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "1",

}

Yalamanchili, S, Verlage, E, Cheng, WH, Fountaine, KT, Jahelka, PR, Kempler, PA, Saive, R, Lewis, NS & Atwater, HA 2020, 'High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays', Nano letters, vol. 20, no. 1, pp. 502-508. https://doi.org/10.1021/acs.nanolett.9b04225

High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays. / Yalamanchili, Sisir; Verlage, Erik; Cheng, Wen Hui; Fountaine, Katherine T.; Jahelka, Philip R.; Kempler, Paul A.; Saive, Rebecca; Lewis, Nathan S.; Atwater, Harry A.

In: Nano letters, Vol. 20, No. 1, 08.01.2020, p. 502-508.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - High Broadband Light Transmission for Solar Fuels Production Using Dielectric Optical Waveguides in TiO2 Nanocone Arrays

AU - Yalamanchili, Sisir

AU - Verlage, Erik

AU - Cheng, Wen Hui

AU - Fountaine, Katherine T.

AU - Jahelka, Philip R.

AU - Kempler, Paul A.

AU - Saive, Rebecca

AU - Lewis, Nathan S.

AU - Atwater, Harry A.

PY - 2020/1/8

Y1 - 2020/1/8

N2 - We describe 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 showed 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.

AB - We describe 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 showed 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.

KW - Broadband transmission

KW - Dielectric nanocone

KW - Nanophotonic

KW - Optoelectronic

KW - Photoelectrochemical

KW - Photovoltaic

UR - http://www.scopus.com/inward/record.url?scp=85077180065&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.9b04225

DO - 10.1021/acs.nanolett.9b04225

M3 - Article

AN - SCOPUS:85077180065

VL - 20

SP - 502

EP - 508

JO - Nano letters

JF - Nano letters

SN - 1530-6984

IS - 1

ER -