Switching between Plasmonic and Fluorescent Copper Sulfide Nanocrystals.

ABSTRACT: Control over the doping density in copper sulfide nanocrystals is of great importance and determines its use in optoelectronic applications such as NIR optical switches and photovoltaic devices. Here, we demonstrate that we can reversibly control the hole carrier density (varying from >10²² cm^-3 to intrinsic) in copper sulfide nanocrystals by electrochemical methods. We can control the type of charge injection, i.e., capacitive charging or ion intercalation, via the choice of the charge compensating cation (e.g., ammonium salts vs Li⁺). Further, the type of intercalating ion determines whether the charge injection is fully reversible (for Li⁺) or leads to permanent changes in doping density (for Cu⁺). Using fully reversible lithium int

SUBMITTER: van der Stam W 

PROVIDER: S-EPMC5609121 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature