DOI: 10.1063/1.3153970. Characterization of ZnS-layer-inserted bulk-heterojunction organic solar cells by ac impedance spectroscopy

Characterization of ZnS-layer-inserted bulk-heterojunction organic solar cells by ac impedance spectroscopy

10.1063/1.3153970

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

A fluorine-doped tin oxide (FTO)/zinc sulfide (ZnS)/[6,6]-phenyl C61 butyric acid methyl ester (PCBM): regioregular poly(3-hexylthiophene) (P3HT)/poly(3,4-ethylenedioxylenethiophene): poly(4-styrene sulfonic acid) (PEDOT:PSS)/Au type organic solar cell (FTO/ZnS/PCBM:P3HT/PEDOT:PSS/Au, ZnS cell) with a 1 cm2 active area was first developed using transparent ZnS prepared on a FTO electrode by a chemical bath deposition method. The ZnS inserted solar cells were investigated by photocurrent-voltage (I-V) and ac impedance spectroscopy (IS) measurements. In photo I-V measurements, the ZnS cell exhibited scattered power conversion efficiencies (η) of 0.7%–1.2% when the FTO/ZnS electrode was not immersed in various aqueous solutions before the fabrication of the ZnS cells. In contrast, the solar cells with a surface-modified FTO/ZnS electrode by immersing in 0.1M Na2S solutions at pH 7–9 containing hydrosulfide ions (HS−) exhibited reproducible η of 1.5%–1.7%. The electric resistance components in the cell consisting of five layers were separately estimated by the IS measurement. The larger η of the solar cell using HS− modified ZnS was explained by the fact that the charge transport resistance at the ZnS/PCBM:P3HT interface became smaller due to this surface modification. When a continuous light irradiation was carried out for the modified cells, the resistance at the ZnS/PCBM:P3HT interface increased, being accompanied by the decrease in the η. That is, the cell performance was controlled mainly by charge transport velocity at the ZnS/PCBM:P3HT interface.

Bibliography

Kuwabara, T., Nakamoto, M., Kawahara, Y., Yamaguchi, T., & Takahashi, K. (2009). Characterization of ZnS-layer-inserted bulk-heterojunction organic solar cells by ac impedance spectroscopy. Journal of Applied Physics, 105(12).

Authors 5

Takayuki Kuwabara (first)
Masayuki Nakamoto (additional)
Yoshitaka Kawahara (additional)
Takahiro Yamaguchi (additional)
Kohshin Takahashi (additional)

References 20 Referenced 43

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Dates

Type	When
Created	16 years, 2 months ago (June 23, 2009, 6:33 p.m.)
Deposited	2 years, 1 month ago (Aug. 1, 2023, 6:51 p.m.)
Indexed	1 month ago (July 30, 2025, 6:53 a.m.)
Issued	16 years, 2 months ago (June 15, 2009)
Published	16 years, 2 months ago (June 15, 2009)
Published Online	16 years, 2 months ago (June 23, 2009)
Published Print	16 years, 2 months ago (June 15, 2009)

Funders 0

None

BibTeX

@article{Kuwabara_2009, title={Characterization of ZnS-layer-inserted bulk-heterojunction organic solar cells by ac impedance spectroscopy}, volume={105}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.3153970}, DOI={10.1063/1.3153970}, number={12}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Kuwabara, Takayuki and Nakamoto, Masayuki and Kawahara, Yoshitaka and Yamaguchi, Takahiro and Takahashi, Kohshin}, year={2009}, month=jun }

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  "abstract": "<jats:p>A fluorine-doped tin oxide (FTO)/zinc sulfide (ZnS)/[6,6]-phenyl C61 butyric acid methyl ester (PCBM): regioregular poly(3-hexylthiophene) (P3HT)/poly(3,4-ethylenedioxylenethiophene): poly(4-styrene sulfonic acid) (PEDOT:PSS)/Au type organic solar cell (FTO/ZnS/PCBM:P3HT/PEDOT:PSS/Au, ZnS cell) with a 1\u2002cm2 active area was first developed using transparent ZnS prepared on a FTO electrode by a chemical bath deposition method. The ZnS inserted solar cells were investigated by photocurrent-voltage (I-V) and ac impedance spectroscopy (IS) measurements. In photo I-V measurements, the ZnS cell exhibited scattered power conversion efficiencies (\u03b7) of 0.7%\u20131.2% when the FTO/ZnS electrode was not immersed in various aqueous solutions before the fabrication of the ZnS cells. In contrast, the solar cells with a surface-modified FTO/ZnS electrode by immersing in 0.1M\u2008Na2S solutions at pH 7\u20139 containing hydrosulfide ions (HS\u2212) exhibited reproducible \u03b7 of 1.5%\u20131.7%. The electric resistance components in the cell consisting of five layers were separately estimated by the IS measurement. The larger \u03b7 of the solar cell using HS\u2212 modified ZnS was explained by the fact that the charge transport resistance at the ZnS/PCBM:P3HT interface became smaller due to this surface modification. When a continuous light irradiation was carried out for the modified cells, the resistance at the ZnS/PCBM:P3HT interface increased, being accompanied by the decrease in the \u03b7. That is, the cell performance was controlled mainly by charge transport velocity at the ZnS/PCBM:P3HT interface.</jats:p>",
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