Surface Passivation and Positive Band-Edge Shift of p-Si(111) Surfaces Functionalized with Mixed Methyl/Trifluoromethylphenylacetylene Overlayers
Surface Passivation and Positive Band-Edge Shift of p-Si(111) Surfaces Functionalized with Mixed Methyl/Trifluoromethylphenylacetylene Overlayers
复制标题
用混合甲基/三氟甲基苯乙炔覆盖层功能化的 p-Si(111) 表面的表面钝化和正带边位移
DOI:
10.1021/acs.jpcc.0c02017
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Lewis, Nathan S.
中科院分区:
文献类型:
--
作者:
Cabán-Acevedo, Miguel;Papadantonakis, Kimberly M.;Brunschwig, Bruce S.;Lewis, Nathan S.
Chemical functionalization of semiconductor surfaces can provide high-efficiency photoelectrochemical devices through molecular-level control of the energetics, surface dipole, surface electronic defects, and chemical reactivity at semiconductor/electrolyte junctions. We describe the covalent functionalization by nucleophilic addition chemistry of p-Si(111) surfaces to produce mixed overlayers of trifluoromethylphenylacetylene (TFMPA) and methyl moieties. Functionalization of Cl-terminated Si(111) surfaces with TFMPA moieties introduced a positive surface molecular dipole that in contact with CH3CN or Hg produced a positive band-edge shift of the semiconductor relative to junctions with CH3-Si(111) surfaces. Methylation of the Cl/TFMPA surfaces using methylmagnesium chloride resulted in the degradation of the TFMPA moieties, whereas methylation using methylzinc chloride allowed controlled production of mixed TFMPA/methyl-terminated surfaces and permitted reversal of the order of the functionalization steps so that nucleophilic addition of TFMPA could be accomplished after methylation of Cl–Si(111) surfaces. Mixed TFMPA/methyl functionalization resulted in a Si(111) surface with surface recombination velocities of 2 × 102cm s–1that exhibited an ∼150 mV positive band-edge shift relative to CH3–Si(111) surfaces.
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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
Noah T. Plymale;Anshul Ramachandran;Allison Lim;B. Brunschwig;N. Lewis
通讯作者:
N. Lewis
影响因子:
15
作者:
Leslie E. O'Leary;Michael J. Rose;Tina X. Ding;E. Johansson;B. Brunschwig;N. Lewis
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N. Lewis
影响因子:
4
作者:
HIGASHI, GS;CHABAL, YJ;RAGHAVACHARI, K
通讯作者:
RAGHAVACHARI, K
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
Elise G. Megehee;Curtis E. Johnson;R. Eisenberg
通讯作者:
R. Eisenberg
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
S. Maldonado;N. Lewis
通讯作者:
N. Lewis