Low temperature inkjet printable transistors can be stacked

April 08, 2016 // By Julien Happich
Researchers from the University of Pennsylvania have developed a library of four nanocrystal inks whose properties they can tune to print functional transistor patterns.

In a paper titled "Exploiting the colloidal nanocrystal library to construct electronic devices", co-authors Cherie Kagan, Professor in the School of Engineering and Applied Science, and Ji-Hyuk Choi, then a member of her lab, describe how they exploited the diversity of colloidal nanocrystals to design materials, interfaces, and processes to construct all-nanocrystal electronic devices using solution-based processes.


Tuneable colloidal nanocrystals ink formulations
make for printable transistors
Credit: University of Pennsylvania

The inks formulated with the tuneable colloidal nanocrystals included metallic silver and semiconducting cadmium selenide nanocrystals for the high-conductivity and high-mobility thin-film electrodes and channel layers of a FET, aluminium oxide nanocrystals to form high–dielectric constant gate insulator layers, and a mix of metallic indium nanocrystals and silver nanocrystals to integrate an indium supply in the deposited electrodes, to passivate and dope the cadmium selenide nanocrystal channel layer (through a low temperature dopant diffusion step).