Search results for "planar heterojunctions"
showing 3 items of 3 documents
ON THE 3D CONTROL OF THE FUNCTIONAL STRUCTURE OF MOLECULAR THIN FILMS
2013
Apart from being a very challenging issue, three-dimensional order in molecular thin films is of critical importance to gain and exploit a series of key properties in emerging fields like organic/hybrid photovoltaics, organic thin film transistors, sensors and plastic electronics in general. For example, the development of nanostructured bi-continuous bulk heterojunctions (BHJs) is an important advancement leading to improved photovoltaic power conversion efficiency with respect to planar heterojunctions. Here we show an original low cost, easy-to-implement and multi-tasking bottom-up approaches to modulate the supramolecular morphology in three-dimensional (3D) systems together with their …
THIN-FILM HETROJUNCTION BY CARBON NANOTUBE DERIVATIVES WITH ENHANCED SOLUBILITY AND OPTICAL PROPERTIES
2012
The combination of single-walled carbon nanotubes (SWNTs), characterized by high electron mobility, with p-type semiconducting polymers could lead to an overall improvement in the exciton dissociation and carrier extraction efficiencies in practical devices.1However, one of the main concern in the use of SWNTs, relates to the their scarce solubility. Chemical modification has been widely employed to increase the solubility of SWNTs, but usual reaction conditions limit such syntheses to a small scale with low productivity. Here, we employ SWNTs which have been functionalized with aromatic and heteroaromatic moieties via 1,3-dipolar cycloaddition and through diazotization reaction under batch…
Pseudo-Planar Organic Heterojunctions by Sequential Printing of Quasi-Miscible Inks
2021
This work deals with the interfacial mixing mechanism of picoliter (pL)-scale droplets produced by sequential inkjet printing of organic-based inks onto ITO/PET surfaces at a moderately high Weber number (~101). Differently from solution dispensing processes at a high Bond number such as spin coating, the deposition by inkjet printing is strictly controlled by droplet velocity, ink viscosity, and surface tension. In particular, this study considers the interfacial mixing of droplets containing the most investigated donor/acceptor couple for organic solar cells, i.e., poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl-C61-butyric acid methyl ester (PCBM), showing how low-viscosity and low-surfac…