Tandem Core–Shell Si–Ta3N5 Photoanodes for Photoelectrochemical Water Splitting

Narkeviciute, Ieva; Chakthranont, Pongkarn; Mackus, Adriaan J. M.; Hahn, Christopher; Pinaud, Blaise A.; Bent, Stacey F.; Jaramillo, Thomas F.

doi:10.1021/acs.nanolett.6b03408

Title: Tandem Core–Shell Si–Ta₃N₅ Photoanodes for Photoelectrochemical Water Splitting

Journal Article · Tue Nov 22 00:00:00 EST 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.6b03408· OSTI ID:1360211

Narkeviciute, Ieva ^[1]; Chakthranont, Pongkarn ^[1]; Mackus, Adriaan J. M. ^[1]; Hahn, Christopher ^[2]; Pinaud, Blaise A. ^[1]; Bent, Stacey F. ^[1]; Jaramillo, Thomas F. ^[2]

Stanford Univ., Stanford, CA (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Here, nanostructured core–shell Si–Ta₃N₅ photoanodes were designed and synthesized to overcome charge transport limitations of Ta₃N₅ for photoelectrochemical water splitting. The core–shell devices were fabricated by atomic layer deposition of amorphous Ta₂O₅ onto nanostructured Si and subsequent nitridation to crystalline Ta₃N₅. Nanostructuring with a thin shell of Ta₃N₅ results in a 10-fold improvement in photocurrent compared to a planar device of the same thickness. In examining thickness dependence of the Ta₃N₅ shell from 10 to 70 nm, superior photocurrent and absorbed-photon-to-current efficiencies are obtained from the thinner Ta₃N₅ shells, indicating minority carrier diffusion lengths on the order of tens of nanometers. The fabrication of a heterostructure based on a semiconducting, n-type Si core produced a tandem photoanode with a photocurrent onset shifted to lower potentials by 200 mV. CoTiO_x and NiO_x water oxidation cocatalysts were deposited onto the Si–Ta₃N₅ to yield active photoanodes that with NiO_x retained 50–60% of their maximum photocurrent after 24 h chronoamperometry experiments and are thus among the most stable Ta₃N₅ photoanodes reported to date.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; CHE-1305124; 680-50-1309

OSTI ID:: 1360211

Journal Information:: Nano Letters, Vol. 16, Issue 12; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 84 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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charge transport
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photoelectrochemical water oxidation

Title: Tandem Core–Shell Si–Ta3N5 Photoanodes for Photoelectrochemical Water Splitting

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Title: Tandem Core–Shell Si–Ta₃N₅ Photoanodes for Photoelectrochemical Water Splitting