Inverted organic solar cells with non-clustering bathocuproine (BCP) cathode interlayers obtained by fullerene doping

Fatemeh Jafari, Bhushan Ramesh Patil, Fatemeh Mohtaram, Andre L. F. Cauduro, Horst-Günter Rubahn, Abbas Behjat, Morten Madsen

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Resumé

Bathocuproine (BCP) is a well-studied cathode interlayer in organic photovoltaic (OPV) devices, where it for standard device configurations has demonstrated improved electron extraction as well as exciton blocking properties, leading to high device efficiencies. For inverted devices, however, BCP interlayers has shown to lead to device failure, mainly due to the clustering of BCP molecules on indium tin oxide (ITO) surfaces, which is a significant problem during scale-up of the OPV devices. In this work, we introduce C70 doped BCP thin films as cathode interlayers in inverted OPV devices. We demonstrate that the interlayer forms smooth films on ITO surfaces, resulting from the introduction of C70 molecules into the BCP film, and that these films possess both improved electron extraction as well exciton blocking properties, as evidenced by electron-only devices and photoluminescence studies, respectively. Importantly, the improved cathode interlayers leads to well-functioning large area (100 mm2) devices, showing a device yield of 100%. This is in strong contrast to inverted devices based on pure BCP layers. These results are founded by the effective suppression of BCP clustering from C70, along with the electron transport and exciton blocking properties of the two materials, which thus presents a route for its integration as an interlayer material towards up-scaled inverted OPV devices.
OriginalsprogEngelsk
Artikelnummer10422
TidsskriftScientific Reports
Vol/bind9
Antal sider8
ISSN2045-2322
DOI
StatusUdgivet - 18. jul. 2019

Fingeraftryk

fullerenes
interlayers
solar cells
cathodes
excitons
indium oxides
tin oxides
electrons
molecules
routes
retarding
photoluminescence

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title = "Inverted organic solar cells with non-clustering bathocuproine (BCP) cathode interlayers obtained by fullerene doping",
abstract = "Bathocuproine (BCP) is a well-studied cathode interlayer in organic photovoltaic (OPV) devices, where it for standard device configurations has demonstrated improved electron extraction as well as exciton blocking properties, leading to high device efficiencies. For inverted devices, however, BCP interlayers has shown to lead to device failure, mainly due to the clustering of BCP molecules on indium tin oxide (ITO) surfaces, which is a significant problem during scale-up of the OPV devices. In this work, we introduce C70 doped BCP thin films as cathode interlayers in inverted OPV devices. We demonstrate that the interlayer forms smooth films on ITO surfaces, resulting from the introduction of C70 molecules into the BCP film, and that these films possess both improved electron extraction as well exciton blocking properties, as evidenced by electron-only devices and photoluminescence studies, respectively. Importantly, the improved cathode interlayers leads to well-functioning large area (100 mm2) devices, showing a device yield of 100{\%}. This is in strong contrast to inverted devices based on pure BCP layers. These results are founded by the effective suppression of BCP clustering from C70, along with the electron transport and exciton blocking properties of the two materials, which thus presents a route for its integration as an interlayer material towards up-scaled inverted OPV devices.",
keywords = "BCP clustering, Inverted Organic Solar Cells, Fullerene doped BCP, BCP-C70, Bathocuproine",
author = "Fatemeh Jafari and Patil, {Bhushan Ramesh} and Fatemeh Mohtaram and Cauduro, {Andre L. F.} and Horst-G{\"u}nter Rubahn and Abbas Behjat and Morten Madsen",
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month = "7",
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doi = "10.1038/s41598-019-46854-w",
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journal = "Scientific Reports",
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Inverted organic solar cells with non-clustering bathocuproine (BCP) cathode interlayers obtained by fullerene doping. / Jafari, Fatemeh; Patil, Bhushan Ramesh; Mohtaram, Fatemeh; Cauduro, Andre L. F.; Rubahn, Horst-Günter; Behjat, Abbas; Madsen, Morten.

I: Scientific Reports, Bind 9, 10422, 18.07.2019.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Inverted organic solar cells with non-clustering bathocuproine (BCP) cathode interlayers obtained by fullerene doping

AU - Jafari, Fatemeh

AU - Patil, Bhushan Ramesh

AU - Mohtaram, Fatemeh

AU - Cauduro, Andre L. F.

AU - Rubahn, Horst-Günter

AU - Behjat, Abbas

AU - Madsen, Morten

PY - 2019/7/18

Y1 - 2019/7/18

N2 - Bathocuproine (BCP) is a well-studied cathode interlayer in organic photovoltaic (OPV) devices, where it for standard device configurations has demonstrated improved electron extraction as well as exciton blocking properties, leading to high device efficiencies. For inverted devices, however, BCP interlayers has shown to lead to device failure, mainly due to the clustering of BCP molecules on indium tin oxide (ITO) surfaces, which is a significant problem during scale-up of the OPV devices. In this work, we introduce C70 doped BCP thin films as cathode interlayers in inverted OPV devices. We demonstrate that the interlayer forms smooth films on ITO surfaces, resulting from the introduction of C70 molecules into the BCP film, and that these films possess both improved electron extraction as well exciton blocking properties, as evidenced by electron-only devices and photoluminescence studies, respectively. Importantly, the improved cathode interlayers leads to well-functioning large area (100 mm2) devices, showing a device yield of 100%. This is in strong contrast to inverted devices based on pure BCP layers. These results are founded by the effective suppression of BCP clustering from C70, along with the electron transport and exciton blocking properties of the two materials, which thus presents a route for its integration as an interlayer material towards up-scaled inverted OPV devices.

AB - Bathocuproine (BCP) is a well-studied cathode interlayer in organic photovoltaic (OPV) devices, where it for standard device configurations has demonstrated improved electron extraction as well as exciton blocking properties, leading to high device efficiencies. For inverted devices, however, BCP interlayers has shown to lead to device failure, mainly due to the clustering of BCP molecules on indium tin oxide (ITO) surfaces, which is a significant problem during scale-up of the OPV devices. In this work, we introduce C70 doped BCP thin films as cathode interlayers in inverted OPV devices. We demonstrate that the interlayer forms smooth films on ITO surfaces, resulting from the introduction of C70 molecules into the BCP film, and that these films possess both improved electron extraction as well exciton blocking properties, as evidenced by electron-only devices and photoluminescence studies, respectively. Importantly, the improved cathode interlayers leads to well-functioning large area (100 mm2) devices, showing a device yield of 100%. This is in strong contrast to inverted devices based on pure BCP layers. These results are founded by the effective suppression of BCP clustering from C70, along with the electron transport and exciton blocking properties of the two materials, which thus presents a route for its integration as an interlayer material towards up-scaled inverted OPV devices.

KW - BCP clustering

KW - Inverted Organic Solar Cells

KW - Fullerene doped BCP

KW - BCP-C70

KW - Bathocuproine

U2 - 10.1038/s41598-019-46854-w

DO - 10.1038/s41598-019-46854-w

M3 - Journal article

C2 - 31320718

VL - 9

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 10422

ER -