Background
Application
• Photoanode for photoelectrochemical
water splitting
• Shift the fermi level by doping
• Form n+-n junction in thin film to improve
charge separation
Advantage of SrNbO2N
• Narrow band gap semiconductor
~1.9eV
• Suitable band edge position for H+H2
and 2O2-O2 reaction
• Stable in both acid and base condition
SrNbO2N particle
XRD pattern shows no impurity phase
Possible compositions:
• SrNbO2N
Nb5+
• SrNbO3
Nb4+
• SrNb(O,N )3 Nb5+&Nb4+
SrNbO2N and SrNbO3 has
similar XRD pattern and Eg
Nb3d XPS Spetra
Adjustable parameters during ammonolysis
•
•
•
•
Temperature
Time
NH3 flow rate
Sample position in
the tube furnance
Non of them affect the ratio between the two
pairs of double peaks to a large extent
“Perovskite and Pyrochlore Tantalum Oxide Nitrides: Synthesis and Characterization” Ph.D.
Thesis S.H.Porter
Nb3d XPS Spetra
Oxide Precursor
for SrNbO2N
SrNbO2N before DI
water wash
SrNbO2N after DI
water wash