1992
DOI: 10.1007/978-94-015-1301-2_4
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Modification of Surface Properties of Layered Compounds by Chemical and (Photo)Electrochemical Processes

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Cited by 5 publications
(9 citation statements)
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“…Layered transition metal dichalcogenide (MX 2 ) materials, such as WSe 2 and MoS 2 , were extensively studied in the 1970s and 1980s for their promising photovoltaic performance when grown as single crystals. In particular, n-type WSe 2 single crystals have shown solar conversion efficiencies as high as 14% in a photoelectrochemical (PEC) liquid-junction cell . In order to achieve such high efficiency, some surface treatment of this material was required, achieved through a variety of methods with various levels of success and reproducibility: (photo)­electrochemical etching, ,, ligand modification, ,, and surface polymerization. , However, the underlying mechanisms for these treatments and improvements have not been well understood. It was hypothesized that these surface treatments or modifications are necessary because step edges act as recombination sites for the photogenerated carriers. , Because of this problem, polycrystalline thin films of these materials were never able to achieve the high efficiencies of their single-crystal counterparts, although improvements could be made via polymerization of the surface .…”
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confidence: 99%
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“…Layered transition metal dichalcogenide (MX 2 ) materials, such as WSe 2 and MoS 2 , were extensively studied in the 1970s and 1980s for their promising photovoltaic performance when grown as single crystals. In particular, n-type WSe 2 single crystals have shown solar conversion efficiencies as high as 14% in a photoelectrochemical (PEC) liquid-junction cell . In order to achieve such high efficiency, some surface treatment of this material was required, achieved through a variety of methods with various levels of success and reproducibility: (photo)­electrochemical etching, ,, ligand modification, ,, and surface polymerization. , However, the underlying mechanisms for these treatments and improvements have not been well understood. It was hypothesized that these surface treatments or modifications are necessary because step edges act as recombination sites for the photogenerated carriers. , Because of this problem, polycrystalline thin films of these materials were never able to achieve the high efficiencies of their single-crystal counterparts, although improvements could be made via polymerization of the surface .…”
mentioning
confidence: 99%
“…More recent work has shown promising performance for PEC solar water splitting using both single crystals and exfoliated thin films of WSe 2 as the photoabsorber, with improved performance using ligand modification, but more work is needed to increase efficiency. Etching or corrosion of single-crystal MX 2 materials, often preferentially along the step edges or dislocation defects, was commonly observed throughout the literature. PEC etching has been reported to significantly increase the solar efficiency of n-type WSe 2 single crystals. However, it requires the use of strong acid or base at elevated temperatures. ,, One additional oddity is that the etching process actually appears to increase the number of edges, which would seem counterintuitive for the increased performance.…”
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