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Title: Solution-processed star-shaped oligomers in normal and inverted organic solar cells
Authors: Trukhanov, Vasily A. 
Mannanov, A. L. 
Burgués-Ceballos, Ignasi 
Savva, Achilleas 
Solodukhin, Alexander N. 
Luponosov, Yuriy N. 
Ponomarenko, Sergey 
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
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.
ISSN: 03796779
Rights: © 2016 Elsevier B.V. All rights reserved.
Type: Article
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