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Title: Understanding the light soaking effects in inverted organic solar cells functionalized with conjugated macroelectrolyte electron-collecting interlayers
Authors: Xu, Weidong 
Xia, Ruidong 
Ye, Tengling 
Zhao, Li 
Kan, Zhipeng 
Mei, Yang 
Yan, Congfei 
Zhang, Xinwen 
Lai, Wenyong 
Keivanidis, Panagiotis E. 
Huang, Wei 
Major Field of Science: Natural Sciences
Field Category: Chemical Sciences
Keywords: Cathode interlayer;Conjugated polyelectrolytes;Inverted solar cells;Light soaking effect;Star‐shaped molecules
Issue Date: 1-Feb-2016
Source: Advanced Science, 2016, vol. 3, no. 2
Volume: 3
Issue: 2
Journal: Advanced Science 
Abstract: Three kinds of charged star-shaped conjugated macroelectrolytes, named as PhNBr, TPANBr, and TrNBr, are synthesized as electron-collecting interlayers for inverted polymer solar cells (i-PSCs). Based on these well-defined structured interlayer materials, the light soaking (LS) effect observed in i-PSCs was studied systematically and accurately. The general character of the LS effect is further verified by studying additional i-PSC devices functionalized with other common interlayers. The key-role of UV photons was confirmed by electrochemical impedance spectroscopy and electron-only devices. In addition, the ultraviolet photoelectron spectroscopy measurements indicate that the work function of the indium tin oxide (ITO)/interlayer cathode is significantly reduced after UV treatment. In these i-PSC devices the LS effect originates from the adsorbed oxygen on the ITO substrates when oxygen plasma is used however, even a small amount of oxygen from the ambient is also enough for triggering the LS effect, albeit with a weaker intensity. Our results suggest that the effect of adsorbed oxygen on ITO needs to be considered with attention while preparing i-PSCs. This is an important finding that can aid the large-scale manufacturing of organic solar cells via printing technologies, which do not always ensure the full protection of the device electrode substrates from oxygen.
ISSN: 2198-3844
DOI: 10.1002/advs.201500245
Rights: © Wiley
Type: Article
Affiliation : Nanjing University of Posts and Telecommunications 
Cyprus University of Technology 
Harbin Institute of Technology 
Istituto Italiano di Tecnologlia 
Nanjing Tech University 
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