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|Title:||Solution-processed star-shaped oligomers in normal and inverted organic solar cells||Authors:||Trukhanov, Vasily A.
Mannanov, A. L.
Solodukhin, Alexander N.
Luponosov, Yuriy N.
Paraschuk, Dmitry Yu
Choulis, Stelios A.
|Keywords:||Normal and inverted architecture;Small-molecule organic solar cells;Star-shaped oligomers||Category:||Electrical Engineering - Electronic Engineering - Information Engineering||Field:||Engineering and Technology||Issue Date:||1-May-2016||Publisher:||Elsevier Ltd||Source:||Synthetic Metals, 2016, Volume 215, Pages 229-234||DOI:||http://dx.doi.org/10.1016/j.synthmet.2016.02.022||Abstract:||The performance of three different star-shaped oligomers (SSOs) as electron donor materials for organic solar cells is investigated. These promising donor components are blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) fullerene acceptor and solution-processed normal and inverted organic solar cells are fabricated. These SSOs are based on a triphenylamine core and differ in the solubilizing groups and the oligothiophene arm length. We have found that the power conversion efficiency (PCE) is by 10-60% higher in the normal structure, mainly due to an enhanced open-circuit voltage and fill factor. The observed difference in device performance can be assigned partly to the lower leakage currents. By using contact angle measurements and atomic-force microscopy studies, we estimate the degree of vertical phase separation in bulk heterojunctions. The latter has a good correlation to the corresponding photocurrent differences obtained in the normal and inverted structure devices.||URI:||http://ktisis.cut.ac.cy/handle/10488/9259||ISSN:||03796779||Rights:||© 2016 Elsevier B.V. All rights reserved.||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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