Mechanical characterizations of high-quality quantum dot arrays via transfer printing

In this study, we investigate the mechanical characteristics of transfer-printed quantum dot (QD) arrays. Transfer printing of a spin-coated QD array by elastomers results in changes of the mechanical properties of the QD films since QDs encapsulated by organic aliphatic ligands can be deformed by physical forces such as pressure. We demonstrate the lateral compaction of a QD film due to the Poisson effect of an elastomeric stamp during transfer printing. Interestingly, the spin-coated QDs on a self-assembled monolayer provide more uniform and denser QD arrays than those on glass. Finally, we demonstrate enhanced device performance of the optoelectronic devices using the printed QD films compared to the spin-coated films on glass.