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Influence of Gas Flow Rate for Formation of Aligned Nanorods in ZnO Thin Films for Solar-Driven Hydrogen Production

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Abstract

ZnO thin films have been deposited in mixed Ar/N2 gas ambient at substrate temperature of 500°C by radiofrequency sputtering of ZnO targets. We find that an optimum N2-to-Ar ratio in the deposition ambient promotes the formation of well-aligned nanorods. ZnO thin films grown in ambient with 25% N2 gas flow rate promoted nanorods aligned along c-axis and exhibit significantly enhanced photoelectrochemical (PEC) response, compared with ZnO thin films grown in an ambient with different N2-to-Ar gas flow ratios. Our results suggest that chamber ambient is critical for the formation of aligned nanostructures, which offer potential advantages for improving the efficiency of PEC water splitting for H2 production.

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Acknowledgements

This work was supported by the US Department of Energy under Contract # DE-AC36-08GO28308.

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Authors and Affiliations

  1. National Renewable Energy Laboratory, Golden, CO, 80401, USA

    Sudhakar Shet, Le Chen, Houwen Tang, Heli Wang, Yanfa Yan, John Turner & Mowafak Al-Jassim

  2. New Jersey Institute of Technology, Newark, NJ, 07102, USA

    Sudhakar Shet & Ravindra Nuggehalli

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  1. Sudhakar Shet
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  2. Le Chen
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  8. Mowafak Al-Jassim
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Correspondence to Sudhakar Shet.

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Shet, S., Chen, L., Tang, H. et al. Influence of Gas Flow Rate for Formation of Aligned Nanorods in ZnO Thin Films for Solar-Driven Hydrogen Production. JOM 64, 526–530 (2012). https://doi.org/10.1007/s11837-012-0299-z

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