Fermi level tuning of topological insulator Bi2(SexTe1−x)3 nanoplates

The crystal structures and morphologies of ternary Bi2(SexTe1−x)3 nanoplates have been systematically characterized by employing atomic force microscopy, scanning electron microscopy, high-resolution transmission electron microscopy equipped with the energy dispersive X-ray spectrometer, and the X-ray diffraction. We find that the Bi2(SexTe1−x)3 nanoplates exhibit uniform charge and surface potential distributions. And their Fermi levels can be effectively tuned up to 0.23 eV by varying the selenium/tellurium composition ratios.