Area dependent behavior of bathocuproine (BCP) as cathode interfacial layers in organic photovoltaic cells

Bhushan Ramesh Patil, Mehrad Ahmadpour, Golnaz Sherafatipour, Talha Qamar, Anton F. Fernandez, Karin Zojer, Horst-Günter Rubahn, Morten Madsen

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Resumé

Standard and inverted configuration small molecule OPV cells incorporating bathocuproine (BCP) as electron transport and exciton blocking layer is investigated, demonstrating that 2 mm2 standard and inverted cells display a maximum performance for BCP thicknesses of 10 nm and 1.5 nm, respectively. The reason for the different optimum BCP thicknesses for the two device configurations is the BCP-metal complex formed between the Ag electrode and the BCP layer in the standard configuration OPV devices. Interestingly, at optimum BCP thicknesses, the inverted OPV cells outperform the standard devices. Upon up-scaling of the device area of the cells from 2 mm2 to 10 and 100 mm2, device failure becomes prominent for the inverted OPV cells, due to aggregation of the evaporated BCP layer on the ITO surface. This demonstrates that although BCP can be adopted for efficient ETL in inverted configuration OPV devices on small scale, it is not suitable for device up-scaling due to severely decreasing device yields. In this work, a possible solution where an ultrathin layer of C70 is evaporated between the ITO and BCP layer is proposed. It is demonstrated that the proposed solution holds a strong potential to minimize the device failures of the BCP based inverted OPV cells to a significant extent, while maintaining good device performances.
OriginalsprogEngelsk
Artikelnummer12608
TidsskriftScientific Reports
Vol/bind8
Sider (fra-til)1-9
ISSN2045-2322
DOI
StatusUdgivet - 22. aug. 2018

Fingeraftryk

photovoltaic cells
cathodes
cells
configurations
ITO (semiconductors)
scaling
excitons
electrodes

Citer dette

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title = "Area dependent behavior of bathocuproine (BCP) as cathode interfacial layers in organic photovoltaic cells",
abstract = "Standard and inverted configuration small molecule OPV cells incorporating bathocuproine (BCP) as electron transport and exciton blocking layer is investigated, demonstrating that 2 mm2 standard and inverted cells display a maximum performance for BCP thicknesses of 10 nm and 1.5 nm, respectively. The reason for the different optimum BCP thicknesses for the two device configurations is the BCP-metal complex formed between the Ag electrode and the BCP layer in the standard configuration OPV devices. Interestingly, at optimum BCP thicknesses, the inverted OPV cells outperform the standard devices. Upon up-scaling of the device area of the cells from 2 mm2 to 10 and 100 mm2, device failure becomes prominent for the inverted OPV cells, due to aggregation of the evaporated BCP layer on the ITO surface. This demonstrates that although BCP can be adopted for efficient ETL in inverted configuration OPV devices on small scale, it is not suitable for device up-scaling due to severely decreasing device yields. In this work, a possible solution where an ultrathin layer of C70 is evaporated between the ITO and BCP layer is proposed. It is demonstrated that the proposed solution holds a strong potential to minimize the device failures of the BCP based inverted OPV cells to a significant extent, while maintaining good device performances.",
author = "Patil, {Bhushan Ramesh} and Mehrad Ahmadpour and Golnaz Sherafatipour and Talha Qamar and Fernandez, {Anton F.} and Karin Zojer and Horst-G{\"u}nter Rubahn and Morten Madsen",
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Area dependent behavior of bathocuproine (BCP) as cathode interfacial layers in organic photovoltaic cells. / Patil, Bhushan Ramesh; Ahmadpour, Mehrad ; Sherafatipour, Golnaz; Qamar, Talha; Fernandez, Anton F. ; Zojer, Karin; Rubahn, Horst-Günter; Madsen, Morten.

I: Scientific Reports, Bind 8, 12608, 22.08.2018, s. 1-9.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Area dependent behavior of bathocuproine (BCP) as cathode interfacial layers in organic photovoltaic cells

AU - Patil, Bhushan Ramesh

AU - Ahmadpour, Mehrad

AU - Sherafatipour, Golnaz

AU - Qamar, Talha

AU - Fernandez, Anton F.

AU - Zojer, Karin

AU - Rubahn, Horst-Günter

AU - Madsen, Morten

PY - 2018/8/22

Y1 - 2018/8/22

N2 - Standard and inverted configuration small molecule OPV cells incorporating bathocuproine (BCP) as electron transport and exciton blocking layer is investigated, demonstrating that 2 mm2 standard and inverted cells display a maximum performance for BCP thicknesses of 10 nm and 1.5 nm, respectively. The reason for the different optimum BCP thicknesses for the two device configurations is the BCP-metal complex formed between the Ag electrode and the BCP layer in the standard configuration OPV devices. Interestingly, at optimum BCP thicknesses, the inverted OPV cells outperform the standard devices. Upon up-scaling of the device area of the cells from 2 mm2 to 10 and 100 mm2, device failure becomes prominent for the inverted OPV cells, due to aggregation of the evaporated BCP layer on the ITO surface. This demonstrates that although BCP can be adopted for efficient ETL in inverted configuration OPV devices on small scale, it is not suitable for device up-scaling due to severely decreasing device yields. In this work, a possible solution where an ultrathin layer of C70 is evaporated between the ITO and BCP layer is proposed. It is demonstrated that the proposed solution holds a strong potential to minimize the device failures of the BCP based inverted OPV cells to a significant extent, while maintaining good device performances.

AB - Standard and inverted configuration small molecule OPV cells incorporating bathocuproine (BCP) as electron transport and exciton blocking layer is investigated, demonstrating that 2 mm2 standard and inverted cells display a maximum performance for BCP thicknesses of 10 nm and 1.5 nm, respectively. The reason for the different optimum BCP thicknesses for the two device configurations is the BCP-metal complex formed between the Ag electrode and the BCP layer in the standard configuration OPV devices. Interestingly, at optimum BCP thicknesses, the inverted OPV cells outperform the standard devices. Upon up-scaling of the device area of the cells from 2 mm2 to 10 and 100 mm2, device failure becomes prominent for the inverted OPV cells, due to aggregation of the evaporated BCP layer on the ITO surface. This demonstrates that although BCP can be adopted for efficient ETL in inverted configuration OPV devices on small scale, it is not suitable for device up-scaling due to severely decreasing device yields. In this work, a possible solution where an ultrathin layer of C70 is evaporated between the ITO and BCP layer is proposed. It is demonstrated that the proposed solution holds a strong potential to minimize the device failures of the BCP based inverted OPV cells to a significant extent, while maintaining good device performances.

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