scholarly journals Suppressing Hydrogen Evolution by Aqueous Silicon Powder Dispersions by Controlled Silicon Surface Oxidation

2012 ◽  
Vol 38 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Shepherd M. Tichapondwa ◽  
Walter W. Focke ◽  
Olinto Del Fabbro ◽  
Elmar Muller
Keyword(s):  
Hydrogen Evolution ◽  
Silicon Surface ◽  
Surface Oxidation ◽  
Silicon Powder ◽  
Aqueous Silicon

scholarly journals SUPPRESSING HYDROGEN EVOLUTION BY AQUEOUS SILICON POWDER DISPERSIONS THROUGH THE INTRODUCTION OF AN ADDITIONAL CATHODIC REACTION

2013 ◽  
Vol 201 (4) ◽  
pp. 501-515 ◽  
Author(s):  
S. M. Tichapondwa ◽  
W. W. Focke ◽  
O. Del Fabbro ◽  
R. W. Sandenbergh ◽  
E. Muller
Keyword(s):  
Hydrogen Evolution ◽  
Silicon Powder ◽  
Cathodic Reaction ◽  
Aqueous Silicon

A universal CoO/CoSe2 heterostructure electrocatalyst towards hydrogen evolution reaction via in-situ partial surface-oxidation-selenization method

2021 ◽  
Vol 267 ◽  
pp. 124644
Author(s):  
Ting Feng ◽  
Fang Wang ◽  
Jianfei Lei ◽  
Yahui Gao ◽  
Xiujuan Jin ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Surface Oxidation

scholarly journals Porous Silicon Structural Evolution from In-Situ Luminescence and Raman Measurements

1996 ◽  
Vol 431 ◽  
Author(s):  
D. R. Tallant ◽  
M. J. Kelly ◽  
T. R. Guilinger ◽  
R. L. Simpson
Keyword(s):  
Porous Silicon ◽  
Silicon Surface ◽  
Structural Evolution ◽  
Surface Oxidation ◽  
Ethanol Solution ◽  
Nonradiative Recombination ◽  
Photoluminescence Intensity ◽  
Exciton Migration ◽  
Photoluminescence Mechanism

AbstractWe performed in-situ photoluminescence and Raman measurements on an anodized silicon surface in the HF/ethanol solution used for anodization. The porous silicon thereby produced, while resident in HF/ethanol, does not immediately exhibit intense photoluminescence. Intense photoluminescence develops spontaneously in HF/ethanol after 18–24 hours or with replacement of the HF/ethanol with water. These results support a quantum confinement mechanism in which exciton migration to traps and nonradiative recombination dominates the de-excitation pathways until silicon nanocrystals are physically separated and energetically decoupled by hydrofluoric acid etching or surface oxidation. The porous silicon surface, as produced by anodization, shows large differences in photoluminescence intensity and peak wavelength over millimeter distances. Parallel Raman measurements implicate nanometer-size silicon particles in the photoluminescence mechanism.

Use of umbrella sampling in the calculation of the potential of the mean force for silicon surface oxidation

1999 ◽  
Vol 426 (3) ◽  
pp. 290-297 ◽  
Author(s):  
Kazuo Teraishi ◽  
Akira Endou ◽  
Isao Gunji ◽  
Momoji Kubo ◽  
Akira Miyamoto ◽  
...  
Keyword(s):  
Silicon Surface ◽  
Surface Oxidation ◽  
Umbrella Sampling ◽  
The Mean

HYDROGEN EVOLUTION ON SURFACE-MODIFIED SILICON POWDER PHOTOCATALYSTS IN AQUEOUS ETHANOL SOLUTIONS

1983 ◽  
Vol 12 (3) ◽  
pp. 269-272 ◽  
Author(s):  
Yoshikuni Taniguchi ◽  
Hiroshi Yoneyama ◽  
Hideo Tamura
Keyword(s):  
Hydrogen Evolution ◽  
Aqueous Ethanol ◽  
Silicon Powder ◽  
Surface Modified

scholarly journals Mitigating the charge trapping effects of D-sorbitol/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) polymer blend contacts to crystalline silicon

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Daniel Cohen ◽  
Esha Thakur ◽  
Michael G. Walter
Keyword(s):  
Polymer Blend ◽  
Silicon Surface ◽  
Crystalline Silicon ◽  
Conductive Polymer ◽  
Surface Oxidation ◽  
Charge Trapping ◽  
Device Performance ◽  
Trap States ◽  
Adhesive Properties ◽  
Surface Trap

Abstract Solution-processable conductive polymers are advantageous materials for making inexpensive, electrical junctions to crystalline semiconductors. We have investigated methods to improve the device performance of hybrid solar cells made from n-type silicon and a conductive polymer glue based on a blend of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and D-sorbitol. The PEDOT:PSS blend behaves like a high work function metal creating a Schottky-type junction. The addition of D-sorbitol increases PEDOT:PSS conductivity and provides adhesive properties, allowing the top contact of the solar cell to be laminated onto the silicon substrate. Unfortunately, the addition of the D-sorbitol to the PEDOT:PSS significantly alters the shape of the measured current-voltage performance curve of a crystalline silicon (n-Si)/PEDOT:PSS junction. Under illumination, this results in a decline in the fill factor (FF) and a drop in photocurrent density (J sc) compared to PEDOT:PSS-only devices. We have discovered that the decline in device performance is likely due to surface trap states caused by D-sorbitol/silicon interaction and/or silicon oxidation. X-ray photoelectron spectroscopic (XPS) analysis shows that surface oxidation quickens, and possible silicon surface functionalization with D-sorbitol occurs while processing the D-sorbitol/PEDOT:PSS contact on H-terminated surfaces. To overcome these interface issues, the silicon surface was chemically modified using surface methylation, making it insensitive to D-sorbitol/silicon interactions and surface oxidation during the processing of the PEDOT:PSS polymer blend contact. This also enabled the crystalline silicon (n-Si)/s-PEDOT:PSS device performance to be maintained for longer periods. Using a silicon surface methylation strategy, good device performance could be achieved without changing the adhesive properties of D-sorbitol/PEDOT:PSS polymer blend.

Study on silicon surface oxidation of post-implant resist cleaning

2009 ◽  
Vol 86 (2) ◽  
pp. 155-159 ◽  
Author(s):  
Keping Han ◽  
Carlo Waldfried ◽  
Skip Berry
Keyword(s):  
Silicon Surface ◽  
Surface Oxidation

scholarly journals Application of crystalline silicon surface oxidation to silicon heterojunction solar cells

2015 ◽  
Vol 15 (10) ◽  
pp. 1168-1172 ◽  
Author(s):  
Takafumi Oikawa ◽  
Keisuke Ohdaira ◽  
Koichi Higashimine ◽  
Hideki Matsumura
Keyword(s):  
Solar Cells ◽  
Silicon Surface ◽  
Crystalline Silicon ◽  
Surface Oxidation ◽  
Heterojunction Solar Cells ◽  
Silicon Heterojunction Solar Cells

scholarly journals Air-stable phosphorus-doped molybdenum nitride for enhanced electrocatalytic hydrogen evolution

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Junqing Yan ◽  
Lingqiao Kong ◽  
Yujin Ji ◽  
Youyong Li ◽  
Jai White ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Surface Oxidation ◽  
Molybdenum Nitride ◽  
Phosphorus Doping ◽  
Weak Preference ◽  
Device Applications ◽  
Current Densities ◽  
Phosphorus Source ◽  
Low Performance ◽  
Phosphorus Doped

AbstractMolybdenum-based electrocatalysts for hydrogen evolution have been investigated extensively in recent years. However, unlike other non-oxides, molybdenum nitride generally shows a weak preference for hydrogen evolution and low performance owing to surface oxidation and the strong Mo–H bond. Here, we prepare an air-stable molybdenum nitride through a multi-step solid-state reaction. We find that a uniformly dispersed mixture of the precursors is optimal for preparation of the electrocatalyst. To further enhance hydrogen evolution performance towards practical device applications, phosphorus doping is carried out, using a few layered black phosphorus source. The phosphorus-doped molybdenum nitride (P–Mo–N) sample catalyzes hydrogen evolution with potentials of 105, 145, and 157 mV at the current densities of 10, 50, and 100 mA/cm2, respectively, in 0.5 M H2SO4 solution with a small Tafel slope of 43 mV/dec. Thus it outperforms many of the state-of-art molybdenum-based hydrogen evolution catalysts reported to date.

Hydrogen Evolution and Surface Oxidation of Nickel Electrodes in Alkaline Solution

1964 ◽  
Vol 111 (6) ◽  
pp. 707 ◽  
Author(s):  
J. L Weininger ◽  
M. W. Breiter
Keyword(s):  
Hydrogen Evolution ◽  
Alkaline Solution ◽  
Surface Oxidation ◽  
Nickel Electrodes
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