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 ...
Spray deposition of Polyethylenimine thin films for the fabrication of fully-sprayed organic photodiodes Falco A; Zaidi A; Lugli P; Abdellah A (Elsevier, 2015)In the last years, a big effort has been put into the investigation of the scalability of deposition processes for organic optoelectronics to achieve large-scale and cost-effective fabrication of functional devices. One ...
Schmidt M; Falco A; Loch M; Lugli P; Scarpa G (American Institute of Physics Inc., 2014)In this paper we report on Indium Tin Oxide (ITO)-free spray coated organic photodiodes with an active layer consisting of a poly(3-hexylthiophen) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blend and ...