NDLI: Substitution of native silicon oxide by titanium in Ni-coated silicon photoanodes for water splitting solar cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Llobet, Antoni Shi, Yuanyuan Han, Tingting Gimbert-Suriñach, Carolina Song, Xiaoxue Lanza, Mario
Copyright Year	2017
Abstract	Using an ultrathin (2 nm) evaporated Ti film to replace the native SiOX of the nSi photoanode and then coating it by thin (2 and 5 nm) Ni layers, the resulting 2 nm Ni/2 nm Ti coated nSi photoanodes (without the native SiOX) reach a photocurrent onset potential of −42 mV relative to the SCE reference electrode in 1 M KOH under 1 simulated sun illumination (−202 mV relative to the potential for the oxygen evolution reaction). With increasing the thickness of the Ni layer to 5 nm, the 5 nm Ni/2 nm Ti/nSi photoanodes show 50 mV lower onset potential than 5 nm Ni directly coated on native SiOX/nSi photoanodes and exhibit a very stable photoelectrochemical performance, which keep 100% activity (10 mA cm−2 at 0.8 V vs. SCE) for ∼6.5 days. These results can be comparable to those of the typical NiOX coated nSi photoanodes with n–p+ buried homojunctions. Using a Ti layer to replace the native SiOX of the nSi photoanodes increases the conductivity of the sample and helps the charge transfer process. In addition, the interlayer Ti film absorbs the oxygen from nearby layers or from the atmosphere, making the Ti layer partially oxidized. The in situ TiOX layer formed from evaporated Ti has more electron defects than the ALD deposited TiO2, and could be responsible for the improved hole conduction process.
Starting Page	1996
Ending Page	2003
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	5
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta08774d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SCE Ti Photocurrent Reference electrode Oxygen evolution Photoelectrochemical cell Oxygen
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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