TY - JOUR
T1 - The effect of Mg-doping and Cu nonstoichiometry on the photoelectrochemical response of CuFeO2
AU - Wuttig, Anna
AU - Krizan, Jason W.
AU - Gu, Jing
AU - Frick, Jessica J.
AU - Cava, Robert Joseph
AU - Bocarsly, Andrew Bruce
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2017
Y1 - 2017
N2 - We report the tuning of CuFeO2 photoelectrodes by Mg doping and Cu deficiency to demonstrate the effects of carrier concentration on the photoresponse. Carrier type and concentration were quantitatively assessed using the Hall effect on pure, Mg-incorporated, and Cu-deficient pellets (CuFe1xMgxO2 and Cu1yFeO2, x = 0, 0.0005, 0.005, 0.02, and y = 0.005, 0.02) over the range of thermodynamic stability achievable using solid-state synthesis. The same samples were used in a photoelectrochemical cell to measure their photoresponse. We find that the material with the lowest p-type carrier concentration and the highest carrier mobility shows the largest photoresponse. Furthermore, we show that increasing the p-type carrier concentration and thus the conductivity to high levels is limited by the delafossite defect chemistry, which changes the majority carrier type from p-type to n-type near the Mg solubility limit (x = 0.05) and at high Cu defect concentrations.
AB - We report the tuning of CuFeO2 photoelectrodes by Mg doping and Cu deficiency to demonstrate the effects of carrier concentration on the photoresponse. Carrier type and concentration were quantitatively assessed using the Hall effect on pure, Mg-incorporated, and Cu-deficient pellets (CuFe1xMgxO2 and Cu1yFeO2, x = 0, 0.0005, 0.005, 0.02, and y = 0.005, 0.02) over the range of thermodynamic stability achievable using solid-state synthesis. The same samples were used in a photoelectrochemical cell to measure their photoresponse. We find that the material with the lowest p-type carrier concentration and the highest carrier mobility shows the largest photoresponse. Furthermore, we show that increasing the p-type carrier concentration and thus the conductivity to high levels is limited by the delafossite defect chemistry, which changes the majority carrier type from p-type to n-type near the Mg solubility limit (x = 0.05) and at high Cu defect concentrations.
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U2 - 10.1039/c6ta06504j
DO - 10.1039/c6ta06504j
M3 - Article
AN - SCOPUS:85006873049
SN - 2050-7488
VL - 5
SP - 165
EP - 171
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 1
ER -