Long-term stabilization of organic solar cells using hydroperoxide decomposers as additives
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Stability of organic solar cells (OPV) remains a big problem on the way to their commercialization. Different approaches are being investigated: development of intrinsically more photochemically stable materials, optimization of encapsulation, and implementation of getter and UV blocking layers. In this study, we investigate stabilization of OPV devices using hydroperoxide decomposers as stabilizing additives. A set of five commercially available additives of organophosphorus, organosulfur, Ni chelate, and blocked thiol type are compared, ternary blended into the active layer, under exposure to aging under ISOS-3 degradation conditions. Improvements in long-term performance of OPV devices were observed upon stabilization with Advapak NEO-1120, lifetime was prolonged by a factor of 1.7, and accumulated power generation increased by a factor of 1.4. The stabilizing mechanisms are discussed using spectroscopic and microscopic measurements.
The authors would like to thank Katrin Risch for recording the FTIR spectra and Doreen Schneider for additional CV measurements. We thankfully acknowledge Dr. Solon Economopoulos for valuable discussion on cyclic voltammetry, and Christiane Orset from Rohm and Haas Europe for material samples. Financial support from the Federal State of Thuringia via the Landesgraduierten Stipendium, and Federal Ministry of Education and Research (BMBF) for funding of research projects EOS (Grant Number 03X3516F), from Interreg 4A Syddanmark-Schleswig-K.E.R.N. for funding project eMotion, and Det Frie Forskningsråd for funding project StabilO is gratefully acknowledged.
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