Enhanced Infrared Photodiodes Based on PbS/PbClx Core/Shell Nanocrystals

摘要

Photodiodes configured to convert incident photons in the short-wave infrared (SWIR) to electric current, where the photodiodes have a PbS/PbClx core/shell nanocrystal absorber layer. The PbClx shell in the PbS/PbClx nanocrystals provide native passivation in the (100) crystal facets and enable removal of native ligands and ligand exchange on the (111) crystal facets of the PbS/PbClx nanocrystals such that the photodiode exhibits reduced current densities under reverse bias and greater infrared photoresponse, providing improved device performance as compared to photodiodes having absorber layers formed from PbS core nanocrystals alone.