TY - JOUR
T1 - Heterogeneous Doping to Improve the Performance of Thin-Film Hematite Photoanodes for Solar Water Splitting
AU - Kay, Asaf
AU - Grave, Daniel A.
AU - Ellis, David S.
AU - Dotan, Hen
AU - Rothschild, Avner
N1 - Funding Information:
This research received funding from the European Research Council under the European Union’s Seventh Framework programme (FP/200702013)/ERC Grant agreement N. [617516]. The results were obtained using central facilities at the Technion’s Hydrogen Technologies Research Laboratory (HTRL), supported by the Adelis Foundation, the Nancy & Stephen Grand Technion Energy Program (GTEP), and the Solar Fuels I-CORE program of the Planning and Budgeting Committee and the Israel Science Foundation (Grant N. 152/ 11); the Photovoltaic Laboratory, supported by the Nancy & Stephen Grand Technion Energy Program (GTEP) and by the Russell Berrie Nanotechnology Institute (RBNI); and the Micro and Nano Fabrication Unit (MNFU). D. A. Grave acknowledges support by Marie-Sklodowska-Curie Individual Fellowship no. 659491.
Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/10/14
Y1 - 2016/10/14
N2 - Ti-doped, undoped, and Zn-doped hematite (α-Fe2O3) thick (∼1 μm) films were found to be n-type, weak n-type, and p-type, respectively. Heterogeneous doping profiles were generated in 30 nm thick hematite stacks on F:SnO2-coated glass substrates with 25 nm thick SnO2 underlayers in order to investigate the effect of different doping profiles on photoelectrochemical performance and compare with homogeneously doped counterpart photoelectrodes. Among the homogeneously doped photoelectrodes, the Ti-doped sample displayed the highest plateau photocurrent but also the highest onset potential, whereas the Zn-doped one had the lowest onset potential and the lowest plateau photocurrent. Heterogeneously doped photoelectrodes displayed both high plateau photocurrent and low onset potential, with the highest performance achieved for the specimen with Ti-doped, undoped, and Zn-doped layers at the bottom, center, and top parts of the stack, respectively. This demonstrates the potential of heterogeneous doping to improve the performance of hematite photoelectrodes for solar water splitting.
AB - Ti-doped, undoped, and Zn-doped hematite (α-Fe2O3) thick (∼1 μm) films were found to be n-type, weak n-type, and p-type, respectively. Heterogeneous doping profiles were generated in 30 nm thick hematite stacks on F:SnO2-coated glass substrates with 25 nm thick SnO2 underlayers in order to investigate the effect of different doping profiles on photoelectrochemical performance and compare with homogeneously doped counterpart photoelectrodes. Among the homogeneously doped photoelectrodes, the Ti-doped sample displayed the highest plateau photocurrent but also the highest onset potential, whereas the Zn-doped one had the lowest onset potential and the lowest plateau photocurrent. Heterogeneously doped photoelectrodes displayed both high plateau photocurrent and low onset potential, with the highest performance achieved for the specimen with Ti-doped, undoped, and Zn-doped layers at the bottom, center, and top parts of the stack, respectively. This demonstrates the potential of heterogeneous doping to improve the performance of hematite photoelectrodes for solar water splitting.
UR - http://www.scopus.com/inward/record.url?scp=85027351716&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.6b00287
DO - 10.1021/acsenergylett.6b00287
M3 - Article
AN - SCOPUS:85027351716
SN - 2380-8195
VL - 1
SP - 827
EP - 833
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 4
ER -
