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Inorganic dye-sensitized solar cell employing In-enriched Cu–In–S ternary colloids prepared in water media

Copper–indium–sulfur (CIS) ternary colloids with different chemical compositions (In/Cu = 1, 2, 3 and 4) were synthesized in “green” water media at 298 K. It was observed that these CIS colloidal particles possess identical crystal structures in tetrahedron. They exhibit energy gaps at 1.7–2.0 eV, w...

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Published in:RSC advances 2015-01, Vol.5 (88), p.71743-71748
Main Authors: Higashimoto, S., Inui, S., Nakase, T., Azuma, M., Yamamoto, M., Takahashi, M.
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Language:English
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cited_by cdi_FETCH-LOGICAL-c264t-abce73329034d2ba40a62852df0ac28fc7ad42a4adc408d88f8d4cde7e8ce0aa3
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container_end_page 71748
container_issue 88
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container_title RSC advances
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creator Higashimoto, S.
Inui, S.
Nakase, T.
Azuma, M.
Yamamoto, M.
Takahashi, M.
description Copper–indium–sulfur (CIS) ternary colloids with different chemical compositions (In/Cu = 1, 2, 3 and 4) were synthesized in “green” water media at 298 K. It was observed that these CIS colloidal particles possess identical crystal structures in tetrahedron. They exhibit energy gaps at 1.7–2.0 eV, which is attributed to the quantum size effects through a decrease of particle sizes from 4 to 2 nm. It was also found that the photoelectrodes employing CIS colloids with the In-enriched compositions exhibit high incident photon to current efficiency (IPCE) up to ca. 780 nm. The solar cell constructed by CIS–TiO 2 ||S x 2− / x S 2− ||carbon electrode exhibited a power conversion efficiency (PCE) up to ca. 2.5%. Furthermore, the CIS–TiO 2 photoelectrode coated with ZnS as passivation layers by SILAR processes exhibited a remarkable improvement of the PCE up to 3.54% (short-circuit current: 8.72 mA cm −2 , open-circuit voltage: 750 mV and fill factor: 53.6%). Effects of chemical compositions and ZnS coating to the photoelectrodes were further discussed by electrochemical impedance spectroscopy.
doi_str_mv 10.1039/C5RA10751B
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source Royal Society of Chemistry
subjects Chemical composition
Coating
COLLOIDAL DISPERSIONS
Colloids
COMPOSITION
Copper
DYES
Media
ORGANIC COMPOUNDS
Photovoltaic cells
Solar cells
SULFIDES
WATER
ZINC SULFIDE
Zinc sulfides
title Inorganic dye-sensitized solar cell employing In-enriched Cu–In–S ternary colloids prepared in water media
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