Over 14% efficiency for ternary organic solar cell with 300 nm thick active layer

phys.org | 6/12/2019 | Staff
KHALED (Posted by) Level 3
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A thick-film (300 nm) ternary OSC is fabricated by introducing phenyl-C61-butyric-acid-methyl ester (PC61BM) into a PBDB-T-2Cl:BTP-4F host blend, as these materials present complementary absorption and well-matched energy levels. By delicately optimizing the blend film morphology and improving the charge carrier mobility, over 14.3% efficiency was achieved for the device based on PBDB-T-2Cl:BTP-4F:PC61BM.

Organic solar cells (OSCs) have drawn great attention due to their advantages of making large area and flexible solar panels through low-cost solution coating methods. Recently, single-junction OSCs with over 16% power conversion efficiency (PCE) have been reported. However, photovoltaic performance of these cells is very sensitive to the variation in the active layer thickness, which has been recognized as a big challenge for practical application of OSCs.

Performance - OSCs - Voltage - VOC - Density

The photovoltaic performance of OSCs is determined by open-circuit voltage (VOC), short-circuit current density (JSC) and fill factor (FF). For the current high efficiency non-fullerene-based system, the efficiency...
(Excerpt) Read more at: phys.org
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