1. Enhanced photocathodic behaviors of Pb(Zr0.20Ti0.80)O3 films on Si substrates for hydrogen production.
- Author
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Xiaorong Cheng, Wen Dong, Fengang Zheng, Liang Fang, and Mingrong Shen
- Subjects
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ZIRCONIUM titanate , *INDIUM tin oxide , *LEAD , *PHOTOCURRENTS , *FERROELECTRIC materials , *PHOTOCATHODES , *HYDROGEN production - Abstract
Wide bandgap ferroelectric Pb(Zr0.20Ti0.80)O3 films were deposited on indium tin oxide (ITO) coated Si-pn+ substrates with an intention to form efficient Si-pn+/ITO/Pb(Zr,Ti)O3 (PZT) photocathode for hydrogen production. Depolarization electric field generated in PZT film due to poling can drive the photogenerated electrons from Si-pn+ junction to PZT film, resulting in enhanced photoelectrochemical activity of the photocathode. Comparing the electrode with asprepared PZT film, the photocurrent increased from ~100 μA cm-2 to -1.2mA cm-2 at 0V vs. reversible hydrogen electrode (RHE) and the onset potential from 0.36V to 0.7V vs. RHE under 100 mW cm-2 illumination, manifesting the great advantage of depolarization electric field in driving the photogenerated carriers not only in the ferroelectric film but also on the interface of different semiconductors. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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