Role of surface reactions in the stabilization of n-CdS-based photoelectrochemical cells

Holly Dee Rubin, Brian Humphrey, Andrew B. Bocarsly

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

The potential use of II-VI semiconductor-aqueous junction cells for the conversion of optical energy to electricity has previously been limited by semiconductor photodecomposition processes combined with low energy conversion efficiencies. Decomposition processes in the prototypical n-CdS photoelectrochemical cell can be efficiently suppressed by addition of an appropriate polychalcogenide redox couple to the electrolyte1-3. However, conversion efficiencies remain low (∼5% at 488 nm)4. Moreover, although increased optical to electrical energy conversion rates can be obtained by using a redox couple such as Fe(CN)4-/3-6 (∼8% conversion efficiency at 488 nm), the cell lifetime is greatly diminished5-7 (t1/2∼1/2h). We report here that the photodecomposition of n-CdS in a Fe(CN)4-/3-6 electrolyte can be dramatically decreased and cell output parameters significantly improved by the presence of an appropriate combination of K+ and Cs + ions. Monochromatic (488 m) conversion efficiencies in excess of 20% have been observed, with fill factors (a measure of the ideality of the cell) in the range of 65%. The enhanced stability and efficiency are associated with in situ chemical derivatization of the n-CdS surface with a layer of K x Csy[CdIIFeII(CN)6]. (This species is an analogue of Prussian blue having a C-bound Fe II/III centre and a nitrogen bound CdII centre. See, for example, ref. 8.)

Original languageEnglish
Pages (from-to)339-341
Number of pages3
JournalNature
Volume308
Issue number5957
DOIs
StatePublished - 1 Dec 1984

Fingerprint

Photoelectrochemical cells
Surface reactions
Conversion efficiency
Stabilization
Energy conversion
Electrolytes
Nitrogen
Electricity
Ions
Semiconductor materials
Decomposition
Oxidation-Reduction

Cite this

Rubin, Holly Dee ; Humphrey, Brian ; Bocarsly, Andrew B. / Role of surface reactions in the stabilization of n-CdS-based photoelectrochemical cells. In: Nature. 1984 ; Vol. 308, No. 5957. pp. 339-341.
@article{d7846803ad2f4f37a8e69c43fd2e98bc,
title = "Role of surface reactions in the stabilization of n-CdS-based photoelectrochemical cells",
abstract = "The potential use of II-VI semiconductor-aqueous junction cells for the conversion of optical energy to electricity has previously been limited by semiconductor photodecomposition processes combined with low energy conversion efficiencies. Decomposition processes in the prototypical n-CdS photoelectrochemical cell can be efficiently suppressed by addition of an appropriate polychalcogenide redox couple to the electrolyte1-3. However, conversion efficiencies remain low (∼5{\%} at 488 nm)4. Moreover, although increased optical to electrical energy conversion rates can be obtained by using a redox couple such as Fe(CN)4-/3-6 (∼8{\%} conversion efficiency at 488 nm), the cell lifetime is greatly diminished5-7 (t1/2∼1/2h). We report here that the photodecomposition of n-CdS in a Fe(CN)4-/3-6 electrolyte can be dramatically decreased and cell output parameters significantly improved by the presence of an appropriate combination of K+ and Cs + ions. Monochromatic (488 m) conversion efficiencies in excess of 20{\%} have been observed, with fill factors (a measure of the ideality of the cell) in the range of 65{\%}. The enhanced stability and efficiency are associated with in situ chemical derivatization of the n-CdS surface with a layer of K x Csy[CdIIFeII(CN)6]. (This species is an analogue of Prussian blue having a C-bound Fe II/III centre and a nitrogen bound CdII centre. See, for example, ref. 8.)",
author = "Rubin, {Holly Dee} and Brian Humphrey and Bocarsly, {Andrew B.}",
year = "1984",
month = "12",
day = "1",
doi = "10.1038/308339a0",
language = "English",
volume = "308",
pages = "339--341",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "5957",

}

Role of surface reactions in the stabilization of n-CdS-based photoelectrochemical cells. / Rubin, Holly Dee; Humphrey, Brian; Bocarsly, Andrew B.

In: Nature, Vol. 308, No. 5957, 01.12.1984, p. 339-341.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Role of surface reactions in the stabilization of n-CdS-based photoelectrochemical cells

AU - Rubin, Holly Dee

AU - Humphrey, Brian

AU - Bocarsly, Andrew B.

PY - 1984/12/1

Y1 - 1984/12/1

N2 - The potential use of II-VI semiconductor-aqueous junction cells for the conversion of optical energy to electricity has previously been limited by semiconductor photodecomposition processes combined with low energy conversion efficiencies. Decomposition processes in the prototypical n-CdS photoelectrochemical cell can be efficiently suppressed by addition of an appropriate polychalcogenide redox couple to the electrolyte1-3. However, conversion efficiencies remain low (∼5% at 488 nm)4. Moreover, although increased optical to electrical energy conversion rates can be obtained by using a redox couple such as Fe(CN)4-/3-6 (∼8% conversion efficiency at 488 nm), the cell lifetime is greatly diminished5-7 (t1/2∼1/2h). We report here that the photodecomposition of n-CdS in a Fe(CN)4-/3-6 electrolyte can be dramatically decreased and cell output parameters significantly improved by the presence of an appropriate combination of K+ and Cs + ions. Monochromatic (488 m) conversion efficiencies in excess of 20% have been observed, with fill factors (a measure of the ideality of the cell) in the range of 65%. The enhanced stability and efficiency are associated with in situ chemical derivatization of the n-CdS surface with a layer of K x Csy[CdIIFeII(CN)6]. (This species is an analogue of Prussian blue having a C-bound Fe II/III centre and a nitrogen bound CdII centre. See, for example, ref. 8.)

AB - The potential use of II-VI semiconductor-aqueous junction cells for the conversion of optical energy to electricity has previously been limited by semiconductor photodecomposition processes combined with low energy conversion efficiencies. Decomposition processes in the prototypical n-CdS photoelectrochemical cell can be efficiently suppressed by addition of an appropriate polychalcogenide redox couple to the electrolyte1-3. However, conversion efficiencies remain low (∼5% at 488 nm)4. Moreover, although increased optical to electrical energy conversion rates can be obtained by using a redox couple such as Fe(CN)4-/3-6 (∼8% conversion efficiency at 488 nm), the cell lifetime is greatly diminished5-7 (t1/2∼1/2h). We report here that the photodecomposition of n-CdS in a Fe(CN)4-/3-6 electrolyte can be dramatically decreased and cell output parameters significantly improved by the presence of an appropriate combination of K+ and Cs + ions. Monochromatic (488 m) conversion efficiencies in excess of 20% have been observed, with fill factors (a measure of the ideality of the cell) in the range of 65%. The enhanced stability and efficiency are associated with in situ chemical derivatization of the n-CdS surface with a layer of K x Csy[CdIIFeII(CN)6]. (This species is an analogue of Prussian blue having a C-bound Fe II/III centre and a nitrogen bound CdII centre. See, for example, ref. 8.)

UR - http://www.scopus.com/inward/record.url?scp=0005675168&partnerID=8YFLogxK

U2 - 10.1038/308339a0

DO - 10.1038/308339a0

M3 - Article

AN - SCOPUS:0005675168

VL - 308

SP - 339

EP - 341

JO - Nature

JF - Nature

SN - 0028-0836

IS - 5957

ER -