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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
Keivanidis, Panagiotis E.
|Keywords:||Cathode interlayer;Conjugated polyelectrolytes;Inverted solar cells;Light soaking effect;Star‐shaped molecules||Category:||Chemical Sciences||Field:||Natural Sciences||Issue Date:||1-Feb-2016||Publisher:||Wiley-VCH Verlag||Source:||Advanced Science, 2016, Volume 3, Issue 2, Article number 1500245||metadata.dc.doi:||10.1002/advs.201500245||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.||URI:||http://ktisis.cut.ac.cy/handle/10488/9944||ISSN:||21983844||Rights:||© 2015 The Authors.||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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