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Decoupling optical and electronic optimization of organic solar cells using high-performance temperature-stable TiO2
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See supplementary material at http://dx.doi.org/10.1063/1.4933414
for optical electrical field profile inside the OPV system, optical and electrical properties of electrodes, performance of devices for different electrodes, EQE, total absorption spectra, relative EQE and total absorption, AFM images with RMS roughness values, optimizing process of Ag thickness, and experimental details and simulation.[Supplementary Material]
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An electrode structured with a TiO2/Ag/TiO2 (TAT) multilayer as indium tin oxide (ITO) replacement with a superior thermal stability has been successfully fabricated. This electrode allows to directly tune the optical cavity mode towards maximized photocurrent generation by varying the thickness of the layers in the sandwich structure. This enables tailored optimization of the transparent electrode for different organic thin film photovoltaics without alteration of their electro-optical properties. Organic photovoltaic featuring our TAT multilayer shows an improvement of ∼12% over the ITO reference and allows power conversion efficiencies (PCEs) up to 8.7% in PTB7:PC71BM devices.
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