TY  - JOUR
AU  - Shavorskiy, Andrey
AU  - Ye, Xiaofei
AU  - Karslıoğlu, Osman
AU  - Poletayev, Andrey D.
AU  - Hartl, Matthias
AU  - Zegkinoglou, Ioannis
AU  - Trotochaud, Lena
AU  - Nemšák, Slavomir
AU  - Schneider, Claus M.
AU  - Crumlin, Ethan J.
AU  - Axnanda, Stephanus
AU  - Liu, Zhi
AU  - Ross, Philip N.
AU  - Chueh, William
AU  - Bluhm, Hendrik
TI  - Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting
JO  - The journal of physical chemistry letters
VL  - 8
IS  - 22
SN  - 1948-7185
CY  - Washington, DC
PB  - ACS
M1  - FZJ-2018-00355
SP  - 5579 - 5586
PY  - 2017
AB  - Photoelectrochemical water splitting is a promising pathway for the direct conversion of renewable solar energy to easy to store and use chemical energy. The performance of a photoelectrochemical device is determined in large part by the heterogeneous interface between the photoanode and the electrolyte, which we here characterize directly under operating conditions using interface-specific probes. Utilizing X-ray photoelectron spectroscopy as a noncontact probe of local electrical potentials, we demonstrate direct measurements of the band alignment at the semiconductor/electrolyte interface of an operating hematite/KOH photoelectrochemical cell as a function of solar illumination, applied potential, and doping. We provide evidence for the absence of in-gap states in this system, which is contrary to previous measurements using indirect methods, and give a comprehensive description of shifts in the band positions and limiting processes during the photoelectrochemical reaction.
LB  - PUB:(DE-HGF)16
C6  - pmid:29083905
UR  - <Go to ISI:>//WOS:000416291600019
DO  - DOI:10.1021/acs.jpclett.7b02548
UR  - https://juser.fz-juelich.de/record/842074
ER  -