Aqueous electrochemistry of tellurium at glassy carbon and gold

Mori, E.; Baker, Charles K.; Reynolds, John R.; Rajeshwar, Krishnan

doi:10.1016/0022-0728(88)80228-6

Cited by 87 publications

(61 citation statements)

References 30 publications

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“…Similar CVs were reported in previous studies using Au single-crystal surfaces 6,21 and polycrystalline Au. [7][8][9][10]26 The reductive deposition of Te from TeO 2 is known to occur by the following four-electron reduction process: [11][12][13][14][15][16][35][36][37] Figure 2 shows the p-in/ p-out SH rotational anisotropy patterns of the Au(111) electrode biased at (a) +800 mV and (b) +150 mV in 0.1 M HClO 4 . Although both patterns showed the 3-fold symmetry with the SH intensity maxima at the azimuthal angles of 60°, 180°, and 300°, the SH intensities at +150 mV were smaller than those at +800 mV.…”

Section: Methodsmentioning

confidence: 99%

In Situ Optical Second Harmonic Rotational Anisotropy Measurements of an Au(111) Electrode during Electrochemical Deposition of Tellurium

1998

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The electrodeposition of Te on a single-crystalline Au(111) electrode was studied with 1064-nm-excited SH rotational anisotropy measurements. The SH rotational anisotropy was significantly changed with the first underpotential deposition (upd) of Te, and the bulk Te deposition attenuated the anisotropic character of the overall surface symmetry. The change in the SH rotational anisotropy during the first upd of Te was examined using two different models. The first model considered only the contribution of the Au(111) surface to the SHG response, while the second one took into account the contributions of both the Au(111) substrate and the adsorbed Te layer. In the former case, the change in the SH rotational anisotropy can be explained by considering the quenching of the nonlinear susceptibility of the Au(111) surface. The analysis based on the latter model resulted in a rotation angle of 608 for the adsorbed Te layer against the the Au(111) lattice. This value was not consistent with that expected from the adsorbate structure of the first upd layer of Te, i.e., ( 3× 3)R30°. Thus, the former model seems to be more appropriate to explain the present results. The SH rotational anisotropy measurement also suggests that the morphology became more isotropic after the bulk Te deposition.

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Section: Methodsmentioning

confidence: 99%

In Situ Optical Second Harmonic Rotational Anisotropy Measurements of an Au(111) Electrode during Electrochemical Deposition of Tellurium

1998

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“…Furthermore, as the CdTe deposition is usually carried out at a potential more positive than the redox potential of the less noble species Cd 2? [24,29], this also contributes to the reduction in the rates of film formation. Composition of the CdTe films also critically depends on the deposition potential.…”

Section: Cdte Film Growth Mechanismmentioning

confidence: 92%

“…and subsequently its reduction over the electrode surface as described by Eq. 7 [27,29,35], Cd 2? ions immediately assimilate into growing Te nuclei to form CdTe.…”

Section: Cdte Film Growth Mechanismmentioning

confidence: 99%

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Properties and mechanism of solar absorber CdTe thin film synthesis by unipolar galvanic pulsed electrodeposition

Rastogi

Sharma

2008

J Appl Electrochem

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Electrochemical deposition of CdTe semiconductor thin films over transparent conducting glass substrates by sequential unipolar current pulses is described. The magnitude of pulsed current and pulse periodicity affects the crystalline structure, morphology, optical absorbance and composition of CdTe films. CdTe films formed under high magnitude pulsed current density *5-15 mA cm -2 are crystalline with dominant cubic structure having (111) plane oriented parallel to the substrate. Stoichiometric CdTe film growth occurs with current pulses of short 25-300 ms periodicity and 3-50 ms duration. A mechanism of the CdTe growth involving in situ cathodic tellurization process step involving H 2 Te formation and reaction with electrochemically deposited Cd monolayer is described. CdTe film growth in the pulsed electrodeposition occurs under mass transport conditions under strong influence of high magnitude pulsed current. This results in much higher growth rates *5-8 lm h -1 for CdTe films which is attractive for CdTe solar cells in a production environment.

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“…Thus, this route has been identifi ed on Pt [67] and Au [90] . This direct six -electron route plays a dominant role in CdSe electrodeposition chemistry [93,94] .…”

Section: Electrodepositionmentioning

confidence: 99%

Thin‐Film Semiconductors Deposited in Nanometric Scales by Electrochemical and Wet Chemical Methods for Photovoltaic Solar Cell Applications

Savadogo

2010

Advances in Electrochemical Sciences and Engineering

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IntroductionThe world net electricity generation has been estimated to increase 77% from 18 trillion kilowatt hour s ( kWh ) in 2006 to 31.8 trillion kWh in 2030 with a value of 23.2 trillion kWh in 2015 1) . On the other hand, the world market capacity of solar photovoltaic power systems escalated from 1.3 gigawatt s ( GW ) in 2001 to 15.2 GW in 2008 for systems which have been installed. In particular, market installations reached a record high of 5.95 GW in 2008 corresponding to a growth of 110% from 2007. The contribution of solar energy to the world net electricity generation is estimated to be 6% by 2050.The production of photovoltaic ( PV ) modules is still based mainly on crystalline silicon (Si) (94%) while 4% of modules are based on thin -fi lm amorphous Si solar cells and 2% are polycrystalline compound solar cells based on CdTe and CuIn 2 Se [1] . Despite the tremendous progress in all aspects of production of Si -based solar cells and the rapid decrease of production cost for PV modules from $5 per peak watt at the beginning of the 1990s to $2.5 per peak watt in 2009, or $0.7 per kWh, this remains effectively too high. Subsidies from some government policies and/or the carbon dioxide market to increase the utilization of clean energy for sustainable development can contribute to reduce the PV energy cost to $0.25 -0.40 per kWh during the fi rst year of the system installation. This cost is similar to that of classic energy where energy cost is higher than $0.25 -0.30 per kWh. For economic viability of this energy without subsidies, the development of ultralow -cost PV systems is one of the important issues to ensure a smooth transition to sustainable energy development. According to a recent US Department of Energy study in the USA [2] , a major research effort is needed to close the huge gap between the current use of solar energy and its enormous underdeveloped potential. One of the identifi ed thrusts of the 5 Advances in Electrochemical Science and Engineering. Edited

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Aqueous electrochemistry of tellurium at glassy carbon and gold

Cited by 87 publications

References 30 publications

In Situ Optical Second Harmonic Rotational Anisotropy Measurements of an Au(111) Electrode during Electrochemical Deposition of Tellurium

In Situ Optical Second Harmonic Rotational Anisotropy Measurements of an Au(111) Electrode during Electrochemical Deposition of Tellurium

Properties and mechanism of solar absorber CdTe thin film synthesis by unipolar galvanic pulsed electrodeposition

Thin‐Film Semiconductors Deposited in Nanometric Scales by Electrochemical and Wet Chemical Methods for Photovoltaic Solar Cell Applications

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