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.

Degradation pathways in standard and inverted DBP-C 70 based organic solar cells / Sherafatipour, G; Benduhn, J; Patil, B R; Ahmadpour, M; Spoltore, D; Rubahn, H-G; Vandewal, K; Madsen, M. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 9:1(2019), p. 4024. [10.1038/s41598-019-40541-6]

Degradation pathways in standard and inverted DBP-C 70 based organic solar cells

Spoltore D;
2019

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.
Degradation pathways in standard and inverted DBP-C 70 based organic solar cells / Sherafatipour, G; Benduhn, J; Patil, B R; Ahmadpour, M; Spoltore, D; Rubahn, H-G; Vandewal, K; Madsen, M. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 9:1(2019), p. 4024. [10.1038/s41598-019-40541-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2918486
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