ZnO-Ag-MoO3 transparent composite electrode for ITO-free, PEDOT: PSS-free bulk-heterojunction organic solar cells

Hyung Woo Choi; N. David Theodore; Terry Alford

doi:10.1016/j.solmat.2013.07.009

ZnO-Ag-MoO₃ transparent composite electrode for ITO-free, PEDOT: PSS-free bulk-heterojunction organic solar cells

Hyung Woo Choi, N. David Theodore, Terry Alford

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

We report on the electrical and optical properties of ZnO/Ag/MoO ₃ (ZAM) multilayer electrodes deposited directly on glass substrates by a combination of radio frequency (RF) and direct current (DC) sputtering for bulk-heterojunction organic solar cells (OSCs). Compared to indium tin oxide (ITO) electrodes showing 20 Ω/sq, the transparent composite electrodes (TCE) in this study exhibited very low sheet resistance of 5 Ω/sq without post annealing. In addition, as a hole transport layer, the MoO₃ performed with a higher fill factor than PEDOT:PSS due to lower series resistance, resulting in a power conversion efficiency of 2.3%, V_oc of 0.59 V, and J_sc of 9 mA/cm². The power conversion efficiency of the OSC with the ZAM electrode is lower than that of organic solar cells on ITO which has 3.3% efficiency, due to lower transmittance after MoO₃ layer deposition. However, our results do support the possibility of using MoO₃ as both Ag protecting and hole transport layers for indium-less and PEDOT:PSS-less bulk-heterojunction OSCs.

Original language	English (US)
Pages (from-to)	446-450
Number of pages	5
Journal	Solar Energy Materials and Solar Cells
Volume	117
DOIs	https://doi.org/10.1016/j.solmat.2013.07.009
State	Published - Aug 5 2013

Keywords

Bulk heterojunction
MoO
Organic solar cell
Zinc oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films

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title = "ZnO-Ag-MoO3 transparent composite electrode for ITO-free, PEDOT: PSS-free bulk-heterojunction organic solar cells",

abstract = "We report on the electrical and optical properties of ZnO/Ag/MoO 3 (ZAM) multilayer electrodes deposited directly on glass substrates by a combination of radio frequency (RF) and direct current (DC) sputtering for bulk-heterojunction organic solar cells (OSCs). Compared to indium tin oxide (ITO) electrodes showing 20 Ω/sq, the transparent composite electrodes (TCE) in this study exhibited very low sheet resistance of 5 Ω/sq without post annealing. In addition, as a hole transport layer, the MoO3 performed with a higher fill factor than PEDOT:PSS due to lower series resistance, resulting in a power conversion efficiency of 2.3%, Voc of 0.59 V, and Jsc of 9 mA/cm2. The power conversion efficiency of the OSC with the ZAM electrode is lower than that of organic solar cells on ITO which has 3.3% efficiency, due to lower transmittance after MoO3 layer deposition. However, our results do support the possibility of using MoO3 as both Ag protecting and hole transport layers for indium-less and PEDOT:PSS-less bulk-heterojunction OSCs.",

keywords = "Bulk heterojunction, MoO, Organic solar cell, Zinc oxide",

author = "Choi, {Hyung Woo} and Theodore, {N. David} and Terry Alford",

year = "2013",

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doi = "10.1016/j.solmat.2013.07.009",

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T1 - ZnO-Ag-MoO3 transparent composite electrode for ITO-free, PEDOT

T2 - PSS-free bulk-heterojunction organic solar cells

AU - Choi, Hyung Woo

AU - Theodore, N. David

AU - Alford, Terry

PY - 2013/8/5

Y1 - 2013/8/5

N2 - We report on the electrical and optical properties of ZnO/Ag/MoO 3 (ZAM) multilayer electrodes deposited directly on glass substrates by a combination of radio frequency (RF) and direct current (DC) sputtering for bulk-heterojunction organic solar cells (OSCs). Compared to indium tin oxide (ITO) electrodes showing 20 Ω/sq, the transparent composite electrodes (TCE) in this study exhibited very low sheet resistance of 5 Ω/sq without post annealing. In addition, as a hole transport layer, the MoO3 performed with a higher fill factor than PEDOT:PSS due to lower series resistance, resulting in a power conversion efficiency of 2.3%, Voc of 0.59 V, and Jsc of 9 mA/cm2. The power conversion efficiency of the OSC with the ZAM electrode is lower than that of organic solar cells on ITO which has 3.3% efficiency, due to lower transmittance after MoO3 layer deposition. However, our results do support the possibility of using MoO3 as both Ag protecting and hole transport layers for indium-less and PEDOT:PSS-less bulk-heterojunction OSCs.

AB - We report on the electrical and optical properties of ZnO/Ag/MoO 3 (ZAM) multilayer electrodes deposited directly on glass substrates by a combination of radio frequency (RF) and direct current (DC) sputtering for bulk-heterojunction organic solar cells (OSCs). Compared to indium tin oxide (ITO) electrodes showing 20 Ω/sq, the transparent composite electrodes (TCE) in this study exhibited very low sheet resistance of 5 Ω/sq without post annealing. In addition, as a hole transport layer, the MoO3 performed with a higher fill factor than PEDOT:PSS due to lower series resistance, resulting in a power conversion efficiency of 2.3%, Voc of 0.59 V, and Jsc of 9 mA/cm2. The power conversion efficiency of the OSC with the ZAM electrode is lower than that of organic solar cells on ITO which has 3.3% efficiency, due to lower transmittance after MoO3 layer deposition. However, our results do support the possibility of using MoO3 as both Ag protecting and hole transport layers for indium-less and PEDOT:PSS-less bulk-heterojunction OSCs.

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KW - Organic solar cell

KW - Zinc oxide

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