Controlled interfacial electron dynamics in highly efficient Zn 2SnO4-based dye-sensitized solar cells

Seong Sik Shin, Dong Wook Kim, Daesub Hwang, Jae Ho Suk, Lee Seul Oh, Byung Suh Han, Dong Hoe Kim, Ju Seong Kim, Dongho Kim, Jin Young Kim, Kug Sun Hong

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Among ternary oxides, Zn2SnO4 (ZSO) is considered for dye-sensitized solar cells (DSSCs) because of its wide bandgap, high optical transmittance, and high electrical conductivity. However, ZSO-based DSSCs have a poor performance record owing largely to the absence of systematic efforts to enhance their performance. Herein, general strategies are proposed to improve the performance of ZSO-based DSSCs involving interfacial engineering/ modification of the photoanode. A conformal ZSO thin film (blocking layer) deposited at the fluorine-doped tin oxide-electrolyte interface by pulsed laser deposition suppressed the back-electron transfer effectively while maintaining a high optical transmittance, which resulted in a 22% improvement in the short-circuit photocurrent density. Surface modification of ZSO nanoparticles (NPs) resulted in an ultrathin ZnO shell layer, a 9% improvement in the open-circuit voltage, and a 4% improvement in the fill factor because of the reduced electron recombination at the ZSO NPs-electrolyte interface. The ZSO-based DSSCs exhibited a faster charge injection and electron transport than their TiO2-based counterparts, and their superior properties were not inhibited by the ZnO shell layer, which indicates their feasibility for highly efficient DSSCs. Each interfacial engineering strategy could be applied to the ZSO-based DSSC independently to lead to an improved conversion efficiency of 6%, a very high conversion efficiency for a non-TiO2 based DSSC.

Original languageEnglish
Pages (from-to)501-509
Number of pages9
JournalChemSusChem
Volume7
Issue number2
DOIs
Publication statusPublished - 2014 Feb

Fingerprint

dye
electron
Electrons
transmittance
Opacity
electrolyte
Electrolytes
Conversion efficiency
oxide
shell
Nanoparticles
engineering
Charge injection
Fluorine
fluorine
Open circuit voltage
Pulsed laser deposition
solar cell
Dye-sensitized solar cells
Tin oxides

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

Cite this

Shin, S. S., Kim, D. W., Hwang, D., Suk, J. H., Oh, L. S., Han, B. S., ... Hong, K. S. (2014). Controlled interfacial electron dynamics in highly efficient Zn 2SnO4-based dye-sensitized solar cells. ChemSusChem, 7(2), 501-509. https://doi.org/10.1002/cssc.201300915
Shin, Seong Sik ; Kim, Dong Wook ; Hwang, Daesub ; Suk, Jae Ho ; Oh, Lee Seul ; Han, Byung Suh ; Kim, Dong Hoe ; Kim, Ju Seong ; Kim, Dongho ; Kim, Jin Young ; Hong, Kug Sun. / Controlled interfacial electron dynamics in highly efficient Zn 2SnO4-based dye-sensitized solar cells. In: ChemSusChem. 2014 ; Vol. 7, No. 2. pp. 501-509.
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abstract = "Among ternary oxides, Zn2SnO4 (ZSO) is considered for dye-sensitized solar cells (DSSCs) because of its wide bandgap, high optical transmittance, and high electrical conductivity. However, ZSO-based DSSCs have a poor performance record owing largely to the absence of systematic efforts to enhance their performance. Herein, general strategies are proposed to improve the performance of ZSO-based DSSCs involving interfacial engineering/ modification of the photoanode. A conformal ZSO thin film (blocking layer) deposited at the fluorine-doped tin oxide-electrolyte interface by pulsed laser deposition suppressed the back-electron transfer effectively while maintaining a high optical transmittance, which resulted in a 22{\%} improvement in the short-circuit photocurrent density. Surface modification of ZSO nanoparticles (NPs) resulted in an ultrathin ZnO shell layer, a 9{\%} improvement in the open-circuit voltage, and a 4{\%} improvement in the fill factor because of the reduced electron recombination at the ZSO NPs-electrolyte interface. The ZSO-based DSSCs exhibited a faster charge injection and electron transport than their TiO2-based counterparts, and their superior properties were not inhibited by the ZnO shell layer, which indicates their feasibility for highly efficient DSSCs. Each interfacial engineering strategy could be applied to the ZSO-based DSSC independently to lead to an improved conversion efficiency of 6{\%}, a very high conversion efficiency for a non-TiO2 based DSSC.",
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Shin, SS, Kim, DW, Hwang, D, Suk, JH, Oh, LS, Han, BS, Kim, DH, Kim, JS, Kim, D, Kim, JY & Hong, KS 2014, 'Controlled interfacial electron dynamics in highly efficient Zn 2SnO4-based dye-sensitized solar cells', ChemSusChem, vol. 7, no. 2, pp. 501-509. https://doi.org/10.1002/cssc.201300915

Controlled interfacial electron dynamics in highly efficient Zn 2SnO4-based dye-sensitized solar cells. / Shin, Seong Sik; Kim, Dong Wook; Hwang, Daesub; Suk, Jae Ho; Oh, Lee Seul; Han, Byung Suh; Kim, Dong Hoe; Kim, Ju Seong; Kim, Dongho; Kim, Jin Young; Hong, Kug Sun.

In: ChemSusChem, Vol. 7, No. 2, 02.2014, p. 501-509.

Research output: Contribution to journalArticle

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T1 - Controlled interfacial electron dynamics in highly efficient Zn 2SnO4-based dye-sensitized solar cells

AU - Shin, Seong Sik

AU - Kim, Dong Wook

AU - Hwang, Daesub

AU - Suk, Jae Ho

AU - Oh, Lee Seul

AU - Han, Byung Suh

AU - Kim, Dong Hoe

AU - Kim, Ju Seong

AU - Kim, Dongho

AU - Kim, Jin Young

AU - Hong, Kug Sun

PY - 2014/2

Y1 - 2014/2

N2 - Among ternary oxides, Zn2SnO4 (ZSO) is considered for dye-sensitized solar cells (DSSCs) because of its wide bandgap, high optical transmittance, and high electrical conductivity. However, ZSO-based DSSCs have a poor performance record owing largely to the absence of systematic efforts to enhance their performance. Herein, general strategies are proposed to improve the performance of ZSO-based DSSCs involving interfacial engineering/ modification of the photoanode. A conformal ZSO thin film (blocking layer) deposited at the fluorine-doped tin oxide-electrolyte interface by pulsed laser deposition suppressed the back-electron transfer effectively while maintaining a high optical transmittance, which resulted in a 22% improvement in the short-circuit photocurrent density. Surface modification of ZSO nanoparticles (NPs) resulted in an ultrathin ZnO shell layer, a 9% improvement in the open-circuit voltage, and a 4% improvement in the fill factor because of the reduced electron recombination at the ZSO NPs-electrolyte interface. The ZSO-based DSSCs exhibited a faster charge injection and electron transport than their TiO2-based counterparts, and their superior properties were not inhibited by the ZnO shell layer, which indicates their feasibility for highly efficient DSSCs. Each interfacial engineering strategy could be applied to the ZSO-based DSSC independently to lead to an improved conversion efficiency of 6%, a very high conversion efficiency for a non-TiO2 based DSSC.

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