Degradation pathways in standard and inverted DBP-C70 based organic solar cells

Golnaz Sherafatipour, johannes Benduhn, Bhushan Ramesh Patil, Mehrad Ahmadpour, Donato Spoltore, Horst-Günter Rubahn, Koen Vandewal, Morten Madsen*

*Corresponding author for this work

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Abstract

Achieving long-term stability in organic solar cells is a remaining bottleneck for the commercialization of this otherwise highly appealing technology. In this work, we study the performance and stability differences in standard and inverted DBP/C70 based organic solar cells. Differences in the charge-transfer state properties of inverted and standard configuration DBP/C70 solar cells are revealed by sensitive external quantum efficiency measurements, leading to differences in the open-circuit voltages of the devices. The degradation of standard and inverted solar cell configurations at ISOS aging test conditions (ISOS-D-3 and ISOS-T-3) was investigated and compared. The results indicate that the performance drop in the small molecule bilayer solar cells is less related to changes at the D-A interface, suggesting also a pronounced morphological stability, and instead, in the case of inverted cells, dominated by degradation at the electron transport layer (ETL) bathocuproine (BCP). Photoluminescence measurements, electron-only-device characteristics, and stability measurements show improved exciton blocking, electron transport properties and a higher stability for BCP/Ag ETL stacks, giving rise to inverted devices with enhanced performance and device stability.
Original languageEnglish
Article number4024
JournalScientific Reports
Volume9
Number of pages11
ISSN2045-2322
DOIs
Publication statusPublished - 11. Mar 2019

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Degradation
Solar cells
Electron transport properties
Open circuit voltage
Quantum efficiency
Organic solar cells
Charge transfer
Photoluminescence
Aging of materials
Molecules
Electrons
bathocuproine
Electron Transport

Cite this

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title = "Degradation pathways in standard and inverted DBP-C70 based organic solar cells",
abstract = "Achieving long-term stability in organic solar cells is a remaining bottleneck for the commercialization of this otherwise highly appealing technology. In this work, we study the performance and stability differences in standard and inverted DBP/C70 based organic solar cells. Differences in the charge-transfer state properties of inverted and standard configuration DBP/C70 solar cells are revealed by sensitive external quantum efficiency measurements, leading to differences in the open-circuit voltages of the devices. The degradation of standard and inverted solar cell configurations at ISOS aging test conditions (ISOS-D-3 and ISOS-T-3) was investigated and compared. The results indicate that the performance drop in the small molecule bilayer solar cells is less related to changes at the D-A interface, suggesting also a pronounced morphological stability, and instead, in the case of inverted cells, dominated by degradation at the electron transport layer (ETL) bathocuproine (BCP). Photoluminescence measurements, electron-only-device characteristics, and stability measurements show improved exciton blocking, electron transport properties and a higher stability for BCP/Ag ETL stacks, giving rise to inverted devices with enhanced performance and device stability.",
author = "Golnaz Sherafatipour and johannes Benduhn and Patil, {Bhushan Ramesh} and Mehrad Ahmadpour and Donato Spoltore and Horst-G{\"u}nter Rubahn and Koen Vandewal and Morten Madsen",
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Degradation pathways in standard and inverted DBP-C70 based organic solar cells. / Sherafatipour, Golnaz; Benduhn, johannes; Patil, Bhushan Ramesh; Ahmadpour, Mehrad; Spoltore, Donato ; Rubahn, Horst-Günter; Vandewal, Koen ; Madsen, Morten.

In: Scientific Reports, Vol. 9, 4024, 11.03.2019.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Sherafatipour, Golnaz

AU - Benduhn, johannes

AU - Patil, Bhushan Ramesh

AU - Ahmadpour, Mehrad

AU - Spoltore, Donato

AU - Rubahn, Horst-Günter

AU - Vandewal, Koen

AU - Madsen, Morten

PY - 2019/3/11

Y1 - 2019/3/11

N2 - Achieving long-term stability in organic solar cells is a remaining bottleneck for the commercialization of this otherwise highly appealing technology. In this work, we study the performance and stability differences in standard and inverted DBP/C70 based organic solar cells. Differences in the charge-transfer state properties of inverted and standard configuration DBP/C70 solar cells are revealed by sensitive external quantum efficiency measurements, leading to differences in the open-circuit voltages of the devices. The degradation of standard and inverted solar cell configurations at ISOS aging test conditions (ISOS-D-3 and ISOS-T-3) was investigated and compared. The results indicate that the performance drop in the small molecule bilayer solar cells is less related to changes at the D-A interface, suggesting also a pronounced morphological stability, and instead, in the case of inverted cells, dominated by degradation at the electron transport layer (ETL) bathocuproine (BCP). Photoluminescence measurements, electron-only-device characteristics, and stability measurements show improved exciton blocking, electron transport properties and a higher stability for BCP/Ag ETL stacks, giving rise to inverted devices with enhanced performance and device stability.

AB - Achieving long-term stability in organic solar cells is a remaining bottleneck for the commercialization of this otherwise highly appealing technology. In this work, we study the performance and stability differences in standard and inverted DBP/C70 based organic solar cells. Differences in the charge-transfer state properties of inverted and standard configuration DBP/C70 solar cells are revealed by sensitive external quantum efficiency measurements, leading to differences in the open-circuit voltages of the devices. The degradation of standard and inverted solar cell configurations at ISOS aging test conditions (ISOS-D-3 and ISOS-T-3) was investigated and compared. The results indicate that the performance drop in the small molecule bilayer solar cells is less related to changes at the D-A interface, suggesting also a pronounced morphological stability, and instead, in the case of inverted cells, dominated by degradation at the electron transport layer (ETL) bathocuproine (BCP). Photoluminescence measurements, electron-only-device characteristics, and stability measurements show improved exciton blocking, electron transport properties and a higher stability for BCP/Ag ETL stacks, giving rise to inverted devices with enhanced performance and device stability.

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