Fully-Sprayed and Flexible Organic Photodiodes with Transparent Carbon Nanotube Electrodes
MetadataShow full item record
SubjectBulk heterojunction; flexible; Spray deposition; Carbon nanotubes (CNT); solution processable; organic photodiode
In this study, we demonstrate the feasibility of TCO-free, fully sprayed organic photodiodes on flexible polyethylene terephthalate (PET) substrates. Transparent conducting films of single-wall carbon nanotubes are spray deposited from aqueous solutions. Low roughness is achieved, and films with sheet resistance values of 160 Omega/sq at 84% in transmittance are fabricated. Process issues related to the wetting of CNTs are then examined and solved, enabling successive spray depositions of a poly(3,4-ethylenedicncythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer and a blend of regioregular poly(3-hexylthiophene-2,5-diyl) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM). The active layer is then optimized, achieving a process yield above 90% and dark currents as low as 10(-4) mA/cm(2). An external quantum efficiency of 65% and high reproducibility in the performance of the devices are obtained. Finally, the impact of the characteristics of the transparent electrode (transmittance and sheet resistance) on the performances of the device are investigated and validated through a theoretical model and experimental data.
Showing items related by title, author, creator and subject.
Robbiano V; Abdellah A; Santarelli L; Falco A; El-Molla S; Titova L; Purschke D; Hegmann F; Cacialli F; Lugli P (Institute of Electrical and Electronics Engineers Inc., 2014)We report on the morphological, electrical and optical characteristics of Carbon nanotube (CNT) films on different transparent substrates, obtained using spray deposition. The effect of different substrate materials on the ...
Successive spray deposition of P3HT/PCBM organic photoactive layers: Material composition and device characteristics Abdellah A; Virdi K; Meier R; Döblinger M; Müller-Buschbaum P; Scheu C; Lugli P; Scarpa G (2012)Controlling the active layer composition in organic electronic devices represents one of the major challenges in their fabrication. In particular, the composition of mixed donor/acceptor active layers for photosensitive ...
Bhatt V; Melzer K; Abdellah A; Lugli P; Teymouri S; Guttenberg Z (IEEE, 2016)Thin films of semiconducting and unsorted carbon nanotubes (CNT) are prepared on a transparent and flexible cyclic olefin polymeric substrate. The CNT biocompatibility is analyzed using L929 mouse fibroblasts and Human ...