气候变化领域集成服务门户(CCPortal): Stable and tunable phosphonic acid dipole layer for band edge engineering of photoelectrochemical and photovoltaic heterojunction devices

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DOI	10.1039/c9ee00748b
	Stable and tunable phosphonic acid dipole layer for band edge engineering of photoelectrochemical and photovoltaic heterojunction devices
	Wick-Joliat R.; Musso T.; Prabhakar R.R.; Löckinger J.; Siol S.; Cui W.; Sévery L.; Moehl T.; Suh J.; Hutter J.; Iannuzzi M.; Tilley S.D.
发表日期	2019
ISSN	1754-5692
起始页码	1901
结束页码	1909
卷号	12 期号:6
英文摘要	A key challenge for photoelectrochemical water splitting is that high performance semiconductors are not stable in aqueous electrolytes, necessitating corrosion protection layers such as TiO2. In the best case, the protection layer would also serve as the heterojunction partner, minimizing complexity and thereby cost. However, the bands of most high performance semiconductors are poorly aligned with TiO2, limiting the photovoltage. Here, we describe a method to overcome this limitation through the placement of a tunable dipole layer at the interface of the p- and n-type materials, shifting the relative band positions to enable an increased photovoltage. The introduction of a phosphonic acid (PA, H3PO3) layer increases the photovoltage of TiO2-protected Si, Sb2Se3, and Cu2O photocathodes. The dipole effect scales with PA surface coverage, and gives even larger shifts when multilayers are employed. By varying the thickness from submonolayer to multilayer (up to 2 nm), we are able to tune the photovoltage of p-Si/TiO2 over a range of 400 mV. © 2019 The Royal Society of Chemistry.
语种	英语
scopus关键词	Antimony compounds; Copper oxides; Corrosion protection; Electrochemistry; Field emission cathodes; Heterojunctions; Magnetic semiconductors; Multilayers; Organic acids; Selenium compounds; Silicon compounds; Titanium dioxide; Aqueous electrolyte; Heterojunction devices; High-performance semiconductors; Phosphonic acids; Photoelectrochemical water splitting; Photoelectrochemicals; Protection layers; Surface coverages; Oxide semiconductors; chemical compound; complexity; electrochemistry; electrode; electrolyte; equipment; inorganic compound; interface; performance assessment; photochemistry; photovoltaic system
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162842
作者单位	Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Zürich, CH-8057, Switzerland; Empa-Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
推荐引用方式 GB/T 7714	Wick-Joliat R.,Musso T.,Prabhakar R.R.,et al. Stable and tunable phosphonic acid dipole layer for band edge engineering of photoelectrochemical and photovoltaic heterojunction devices[J],2019,12(6).
APA	Wick-Joliat R..,Musso T..,Prabhakar R.R..,Löckinger J..,Siol S..,...&Tilley S.D..(2019).Stable and tunable phosphonic acid dipole layer for band edge engineering of photoelectrochemical and photovoltaic heterojunction devices.Energy and Environmental Science,12(6).
MLA	Wick-Joliat R.,et al."Stable and tunable phosphonic acid dipole layer for band edge engineering of photoelectrochemical and photovoltaic heterojunction devices".Energy and Environmental Science 12.6(2019).