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Title: Well-defined star-shaped conjugated macroelectrolytes as efficient electron-collecting interlayer for inverted polymer solar cells
Authors: Xu, Weidong 
Kan, Zhipeng 
Ye, Tengling 
Zhao, Li 
Lai, Wenyong 
Xia, Ruidong 
Lanzani, Guglielmo 
Keivanidis, Panagiotis E. 
Huang, Wei 
Major Field of Science: Natural Sciences
Field Category: Chemical Sciences
Keywords: Cathode interlayer;Conjugated polyeletrolytes;Inverted polymer solar cells;Star-shaped molecule
Issue Date: 14-Jan-2015
Source: ACS Applied Materials and Interfaces, 2015, vol. 7, iss. 1, pp. 452-459
Volume: 7
Issue: 1
Start page: 452
End page: 459
DOI: 10.1021/am506470b
Journal: ACS Applied Materials & Interfaces 
Abstract: A star-shaped monodisperse conjugated macroelectrolyte grafted with cationic side chains, TrNBr, was designed, synthesized, and utilized as efficient electron-collecting cathode interlayers for inverted polymer solar cells. A neutral one composed of identical star-shaped conjugated backbone, TrOH, was also investigated for comparison. The surface properties and the function as interfacial layers on modulating the work function of bottom electrode (indium tin oxide) were systematically studied. Both interfacial electron-selective materials show strongly thickness-dependent performance for inverted polymer solar cells, and the best performance could be achieved via optimizing the thickness with 2.4 nm of TrNBr and 8.7 nm of TrOH. Parallel investigations of optimized TrNBr and TrOH interlayer in inverted architecture with active blend layer of poly(3-hexylthiophene):indene-C60 bisadduct (P3HT:ICBA) demonstrated a remarkable power conversion efficiency (PCE) enhancement (PCE of 4.88% for TrNBr and 4.74% for TrOH) in comparison with those of conventional noninverted devices using Ca/Al cathodes (3.94%) and inverted devices with sol-gel ZnO buffer layer (4.21%). In addition, the inverted devices using the TrNBr and TrOH interlayer exhibited improved device stability in contrast to conventional noninverted devices using Ca/Al cathodes.
ISSN: 19448244
DOI: 10.1021/am506470b
Rights: © American Chemical Society.
Type: Article
Affiliation : Nanjing University of Posts and Telecommunications 
Fondazione Istituto Italiano di Tecnologia 
Nanjing Tech University 
Cyprus University of Technology 
Harbin Institute of Technology 
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