Thiocyanate-capped PbS nanocubes: ambipolar transport enables quantum dot based circuits on a flexible substrate.
We report the use of thiocyanate as a ligand for lead sulfide (PbS) nanocubes for high-performance, thin-film electronics. PbS nanocubes, self-assembled into thin films and capped with the thiocyanate, exhibit ambipolar characteristics in field-effect transistors. The nearly balanced, high mobilities for electrons and holes enable the fabrication of CMOS-like inverters with promising gains of ∼22 from a single semiconductor material. The mild chemical treatment and low-temperature processing conditions are compatible with plastic substrates, allowing the realization of flexible, nonsintered quantum dot circuits.
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
Weon-Kyu
WK
Koh
Sangameshwar R
SR
Saudari
Aaron T
AT
Fafarman
Cherie R
CR
Kagan
Christopher B
CB
Murray
D003460:Crystallization / Q000379:methods*; D004579:Electron Transport; D007854:Lead / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013499:Surface Properties; D013861:Thiocyanates / Q000737:chemistry*
D046911:Macromolecular Substances; D018036:Selenium Compounds; D013861:Thiocyanates; C088065:lead selenide; D007854:Lead; C031760:thiocyanate