  We present an easy drop-casting based functionalization of MoS2-based
photodetectors that results in an enhancement of the photoresponse of about
four orders of magnitude, reaching responsivities up to 100 A/W. The
functionalization is technologically trivial, air-stable, fully reversible and
reproducible, and opens the door to the combination of 2D-materials with
molecular dyes for the development of high performance photodetectors.
