Colloidal quantum dot photodetectors enhanced by self-assembled plasmonic nanoparticles.

Self-assembled colloidal plasmonic silver nanoparticles monolayers were integrated into solution-processed colloidal quantum dot (QD) photodetectors. We observed plasmon enhancement of photodetector responsivity over a board spectrum range (400-600 nm), with a 1.2-1.6 fold enhancement for a 440-nm-thick QD film device and a 2.4-3.3 fold enhancement for a 100-nm-thick QD device. The enhancement behavior was wavelength dependent with higher enhancement factor at longer wavelengths. The origins of responsivity enhancement were discussed. [ABSTRACT FROM AUTHOR]