Solar Energy Materials

Gibson, Elizabeth A.; Hagfeldt, Anders

doi:10.1002/9780470977798.ch3

Cited by 5 publications

(3 citation statements)

References 365 publications

(564 reference statements)

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“…It is noteworthy that the mismatch was negligible when the diffusion length calculated from the lifetime was 1 mm, which is a doublet of the thickness of the wafer we used (0.5 mm). This result is in agreement with general knowledge in the field of Si photovoltaics, where the doublet diffusion length significantly affects the collection of charge carriers without recombination loss …”

Section: Resultssupporting

confidence: 92%

Design Guidelines of Insulator for Improving Stability and Performance of Nanoelectrocatalyst/Insulator/Semiconductor Photoelectrochemical Cells

Jung

Kim

Park

et al. 2019

ACS Appl. Energy Mater.

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Electrocatalyst/insulator/semiconductor configurations have been considered as promising designs for efficient photoelectrochemical (PEC) water-splitting reactions. However, the roles and effects of the insulator on the PEC reactions have not been clearly understood, in particular, for the nanoelectrocatalyst integrated semiconductor. In this study, we investigated the effects and ability of insulator material and thickness in terms of the stability and performance for PEC alkaline water reduction reaction by integrating nanocrystalline NiO x electrocatalyst/insulator/p-Si photocathodes. This was clearly understood by comparing the stability and performance of amorphous TiO x and SiO2. We demonstrated that the a-TiO x with low barrier height for electron transfer relative to that for hole transfer shows the ability for selective collection of photogenerated minority charge (electron) carriers. This enables a high open circuit potential while minimizing the kinetic overpotential required for electron transfer. The a-TiO x also renders excellent passivation ability for the Si surface defects, minimizing the recombination loss. In addition to these PEC performance improvements, the ability to protect completely the Si surface against corrosive electrolyte permeating through the nanocrystalline NiO x ensures long-term stability. All these abilities were maximized by optimizing the thickness of the a-TiO x (10 nm), thereby enabling the sustainable generation of a photocurrent of 10 mA/cm2 at a high potential level of 0.3 V (vs reversible hydrogen electrode). These results present design guidelines for the insulator along with methods to determine the effects of the insulator on PEC responses.

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Section: Resultssupporting

confidence: 92%

Design Guidelines of Insulator for Improving Stability and Performance of Nanoelectrocatalyst/Insulator/Semiconductor Photoelectrochemical Cells

Jung

Kim

Park

et al. 2019

ACS Appl. Energy Mater.

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“…An overview of the various solar cell types has been published by Gibson and Hagfeldt. [1] In DSSCs the light-absorbing element is a monomolecular dye layer adsorbed on a porous, high-surface semiconductor substrate. The highest not certified sunlight-to-electricity energy conversion efficiency is 14%.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Cells Based on Dye Sensitization for Electricity and Fuel Production

Vlachopoulos

Hagfeldt

2019

Chimia

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Dye-sensitized semiconductor oxide photoelectrodes in which light is absorbed by a monomolecular layer of dye chemisorbed on a porous oxide substrate have attracted considerable interest in the last 35 years, mainly for the conversion of sunlight to electricity, in dye-sensitized solar cells (DSSCs) with maximal efficiencies in the range 10–15%, and, most recently, as dye-sensitized photoelectrochemical cells (DSPECs) for the generation of solar fuels. In the latter direction, considerable progress has been achieved but the efficiency is notably lower than for electricity generation. In the present review, the basic physicochemical principles of the DSSC and DSPEC operation are described, several keynote results reported, and the factors limiting the performance and necessitating further research highlighted.

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“…A useful link for PV updates is www.solarbuzz.com. For a review of PV technologies with special emphasis on the materials science aspects we refer to Gibson and Hagfeldt (2011).…”

Section: Introductionmentioning

confidence: 99%

Brief Overview of Dye-Sensitized Solar Cells

Hagfeldt

2012

AMBIO

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Dye-sensitized solar cells (DSC) are based on molecular and nanometer-scale components. Record cell efficiencies of 12%, promising stability data and means of energy-efficient production methods have been accomplished. As selling points for the DSC technology the prospect of low-cost investments and fabrication are key features. DSCs offer the possibilities to design solar cells with a large flexibility in shape, color, and transparency. The basic principles of the operation of DSC, the state-of-the-art as well as the potentials for future development are described.

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Solar Energy Materials

Cited by 5 publications

References 365 publications

Design Guidelines of Insulator for Improving Stability and Performance of Nanoelectrocatalyst/Insulator/Semiconductor Photoelectrochemical Cells

Design Guidelines of Insulator for Improving Stability and Performance of Nanoelectrocatalyst/Insulator/Semiconductor Photoelectrochemical Cells

Photoelectrochemical Cells Based on Dye Sensitization for Electricity and Fuel Production

Brief Overview of Dye-Sensitized Solar Cells

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