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As a methodology for controlling the carrier transport of topologicalinsulators (TI's), a flexible tuning in carrier number on the surface states(SS's) of three dimensional TI's by surface modifications using organicmolecules is described. The principle of the carrier tuning and its typeconversion of TI's presented in this research are based on the charge transferof holes or electrons at the TI/organic molecule interface. By employing2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) as an electronacceptor or tetracyanoquinodimethane (TCNQ) as a donor for n- and p-Bi2-xSbxTe3-ySey (BSTS) single crystals, successful carrier conversion from nto p and its reverse mode is demonstrated depending on the electron affinitiesof the molecules. The present method provides a nondestructive and efficientmethod for local tuning in carrier density of TI's, and is useful for futureapplications.

Electron and Hole Injection via Charge Transfer at the Topological-Insulator $Bi_{2-x}Sb_xTe_{3-y}Se_y$/Organic-Molecule Interface