Multistep resistive switching of doped Cu-TCNQ nanocrystals

Abstract

The resistive switching behavior of doped copper-(7,7,8,8-tetracyanoquinodimethane) (Cu-TCNQ) nanocrystals was different from that of bulk crystal. The doped Cu-TCNQ nanocrystals took the same crystal structure as bulk crystal (Cu:TCNQ = 1:1) in spite of the different composition ratio (Cu:TCNQ = 1.3:1). The excess amount of Cu resulted in the generation of TCNQ dianions (TCNQ^2–) in Cu-TCNQ nanocrystals to keep the charge balance between TCNQ and excessive Cu, which led to multistep resistive switching behavior involving multistep charge transfer of TCNQ^2–.

Keywords:

• Charge-transfer complex
• nanocrystals
• co-precipitation method
• doping
• resistive switching

Additional information

Funding

This work was partially supported by JP17H05248 in Scientific Research on Innovative Areas “Photosynergetics.”