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Bilayer–Ternary Polymer Solar Cells Fabricated Using Spontaneous Spreading on Water

AbstractA new method is presented to fabricate bilayer organic solar cells via sequential deposition of bulk‐heterojunction layers obtained using spontaneous spreading of polymer–fullerene blends on a water surface. Using two layers of a small bandgap diketopyrrolopyrrole polymer–fullerene blend, a small improvement in power conversion efficiency (PCE) from 4.9% to 5.1% is obtained compared to spin‐coated devices of similar thickness. Next, bilayer–ternary cells are fabricated by first spin coating a wide bandgap thiophene polymer–fullerene blend, followed by depositing a small bandgap diketopyrrolopyrrole polymer–fullerene layer by transfer from a water surface. These novel bilayer–ternary devices feature a PCE of 5.9%, higher than that of the individual layers. Remarkable, external quantum efficiencies (EQEs) over 100% are measured for the wide bandgap layer under near‐infrared bias light illumination. Drift‐diffusion calculations confirm that near‐infrared bias illumination can result in a significant increase in EQE as a result of a change in the internal electric field in the device, but cannot yet account for the magnitude of the effect. The experimental results indicate that the high EQEs over 100% under bias illumination are related to a barrier for electron transport over the interface between the two blends.
- Chinese Academy of Sciences China (People's Republic of)
- Technical University Eindhoven TU Eindhoven Research Portal Netherlands
- Beijing National Laboratory for Molecular Sciences China (People's Republic of)
- University of Groningen Netherlands
- Technical University Eindhoven Netherlands
spontaneous spreading, Sustainability and the Environment, RECOMBINATION, CHARGE-LIMITED CURRENTS, FILL FACTOR, bilayer-ternary solar cells, bilayer–ternary solar cells, Materials Science(all), To be checked by Faculty, POWER CONVERSION EFFICIENCY, SDG 7 - Affordable and Clean Energy, Renewable Energy, polymer solar cells, SDG 7 – Betaalbare en schone energie, sequential deposition
spontaneous spreading, Sustainability and the Environment, RECOMBINATION, CHARGE-LIMITED CURRENTS, FILL FACTOR, bilayer-ternary solar cells, bilayer–ternary solar cells, Materials Science(all), To be checked by Faculty, POWER CONVERSION EFFICIENCY, SDG 7 - Affordable and Clean Energy, Renewable Energy, polymer solar cells, SDG 7 – Betaalbare en schone energie, sequential deposition
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).29 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10%
