High efficiency <i>n</i>-Cd(Se,Te)/S=photoelectrochemical cell resulting from solution chemistry control

Licht, Stuart; Tenne, Reshef; Dagan, Geula; Hodes, Gary; Manassen, J.; Cahen, David; Triboulet, R.; Rioux, J.; Lévy‐Clément, C.

doi:10.1063/1.95556

Cited by 68 publications

(16 citation statements)

References 17 publications

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“…When cesium polysulfide is used as electrolyte the low tendency of ion pairing favors the chemisorption of polysulfide ions at the SCLJ which results in a larger E fb shift compared to other polysulfide electrolytes. 75 The additional shift improved the hole extraction rate and accordingly boosted the overall solar energy conversion from 7.7% to B13%. On the other hand, when Fe(CN) 6 4À/3À is employed as electrolyte with CdS photoelectrodes, the addition of Cs + has been hypothesized to induce an in situ chemical derivatization of the electrode surface, which results in the deposition of a K x Cs y [CdFe(CN) 6 ] layer.…”

Section: Molecular and Ionic Interfacial Modifiersmentioning

confidence: 99%

Surface modification of semiconductor photoelectrodes

Guijarro

Prévot

Sivula

2015

Phys. Chem. Chem. Phys.

144

123

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Photoelectrochemical (PEC) cells have emerged as promising devices that afford the direct conversion of solar energy into electric power and/or chemical fuels. Apart from the obvious importance of the bulk properties of semiconductor materials employed as photoelectrodes, the semiconductor-liquid interface has proven to strongly govern surface-related processes, i.e. the stability, charge separation/recombination and catalytic activity. Because of this, numerous surface treatments have been reported in an effort to tailor the physicochemical properties of the semiconductor-liquid interface, and in turn, the overall PEC response. In this Perspective article we provide a brief conceptual overview of these surface engineering treatments, connecting the particular effects on the interfacial energetics with the respective consequences on the performance. The beneficial effects that arise from surface treatment are categorized as (i) the protection of the surface against photocorrosion, (ii) the passivation of deleterious surface states, (iii) the modification of the band edge positions or band bending, and (iv) the selective extraction of carriers and improved catalytic activity. State-of-the-art surface treatments such as the adsorption of organic molecules or ions, the deposition of semiconductor overlayers and metal nanoparticles or etching procedures are exemplified and described with respect to the observed beneficial effects. A common emerging theme from recent work is that one single surface treatment can lead to multiple distinct effects. Overall, we suggest that surface engineering holds the key for effectively managing the intrinsic common defects of native semiconductor photoelectrodes regardless of their nature, leading to improved light harvesting efficiency.

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Section: Molecular and Ionic Interfacial Modifiersmentioning

confidence: 99%

Surface modification of semiconductor photoelectrodes

Guijarro

Prévot

Sivula

2015

Phys. Chem. Chem. Phys.

144

123

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“…In the following years, Licht et al carried out extensive research on solution chemistry for the n‐type semiconductor–sulfur/(poly)sulfide‐based photoelectrochemical systems. Different alkali cations in aqueous polysulfide solutions, although not directly involved in the reactions, were proved to vary the open‐circuit potential, photocurrent, relative efficiency, stability, etc .…”

Section: Solar Rfb Configurationsmentioning

confidence: 99%

“…Moreover, the hydroxide that was added during the preparation of polysulfide solution was revealed to be detrimental to the PEC performance . Through solution control, a PEC based on CdSe 0.65 Te 0.35 photoelectrode with an efficiency of 12.7% was demonstrated when Cs was utilized as the cation and the cesium sulfide to sulfur was 1.8 m :3.0 m …”

Section: Solar Rfb Configurationsmentioning

confidence: 99%

Solar Redox Flow Batteries: Mechanism, Design, and Measurement

Cao

Skyllas‐Kazacos

Wang

2018

Advanced Sustainable Systems

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The increasing public awareness of the energy crisis since the 1970s has promoted the ongoing development of energy conversion and storage systems. As a supplement to photovoltaics, photoelectrochemical cells (PECs) are among the promising solar electricity generation systems. However, the intrinsic intermittence of sunlight can never guarantee continuous electricity supply. Therefore, PECs are being developed to convert solar energy to chemical energy in the forms of fuels such as H2 and other organic chemicals. However, this technology requires massive storage systems for the solar fuels/chemicals, and complementary conversion systems for electricity generation from the solar fuels. Redox flow batteries (RFBs) are capable of large‐scale real‐time electricity storage and conversion. Both PECs and RFBs have been investigated for more than three decades, yet the integration of these two systems has not reached maturity. Hence, this review aims to give a critical overview of the state‐of‐the‐art progress in solar redox flow batteries, from the aspects of the working mechanism, device engineering, and performance evaluation.

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“…The semiconductors included layered compounds (MX 2 (M = Mo and W, X = S or Se, InSe, ZrSe 2 , In 2/3 PSe 3 , GeSe, etc.) [2][3][4][5][6] and II-VI alloys (such as CdTe, CdSe 1-x Te x with 0<x<1) [7][8][9]. Such study allowed to analyze the effect of the structural dimensionality of the semiconductor on the photoelectrochemical properties and to reach physical parameters of the semiconductor such as type of conductivity, bandgap, direct/indirect optical transition, Fermi level, energy positions of the band edges.…”

Section: Photoelectrochemistry Of Single-crystal Semiconductor Electrmentioning

confidence: 99%

(Research Award of the Energy and Technology Division) (Photo)Electrochemistry in the Service of Solar Energy Conversion

Lévy‐Clément

2011

ECS Trans.

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The paper is a short summary of the lecture delivered for the 2011 Research Award of the Energy Technology Division. The main expertise field of my group is materials science and (photo)electrochemistry for energy conversion and storage. The motivations that oriented my research are described, spanning from photoelectrochemistry of single crystal semiconductors, p-n photoelectroelectrochemical cells for solar hydrogen generation, to the photoetching of semiconductors, electrochemical processing of silicon surface including porous silicon, electrodeposition of polycrystalline semiconductor thin films and monocrystalline nanowires and development of Eta (extremely thin absorber) solar cells.

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High efficiency n-Cd(Se,Te)/S=photoelectrochemical cell resulting from solution chemistry control

Cited by 68 publications

References 17 publications

Surface modification of semiconductor photoelectrodes

Surface modification of semiconductor photoelectrodes

Solar Redox Flow Batteries: Mechanism, Design, and Measurement

(Research Award of the Energy and Technology Division) (Photo)Electrochemistry in the Service of Solar Energy Conversion

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