title: Topological insulator nanostructures for near-infrared transparent flexible electrodes.
abstract: Topological insulators are an intriguing class of materials with an insulating bulk state and gapless Dirac-type edge/surface states. Recent theoretical work predicts that few-layer topological insulators are promising candidates for broadband and high-performance optoelectronic devices due to their spin-momentum-locked massless Dirac edge/surface states, which are topologically protected against all time-reversal-invariant perturbations. Here, we present the first experimental demonstration of near-infrared transparent flexible electrodes based on few-layer topological-insulator Bi(2)Se(3) nanostructures epitaxially grown on mica substrates by means of van der Waals epitaxy. The large, continuous, Bi(2)Se(3)-nanosheet transparent electrodes have single Dirac cone surface states, and exhibit sheet resistances as low as ~330 Ω per square, with a transparency of more than 70% over a wide range of wavelengths. Furthermore, Bi(2)Se(3)-nanosheet transparent electrodes show high chemical and thermal stabilities as well as excellent mechanical durability, which may lead to novel optoelectronic devices with unique properties.
authors.affiliation: Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China. hlpeng@pku.edu.cn
authors.forename: Hailin
authors.initials: H
authors.lastname: Peng
authors.forename: Wenhui
authors.initials: W
authors.lastname: Dang
authors.forename: Jie
authors.initials: J
authors.lastname: Cao
authors.forename: Yulin
authors.initials: Y
authors.lastname: Chen
authors.forename: Di
authors.initials: D
authors.lastname: Wu
authors.forename: Wenshan
authors.initials: W
authors.lastname: Zheng
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Zhi-Xun
authors.initials: ZX
authors.lastname: Shen
authors.forename: Zhongfan
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry*; D004566:Electrodes; D007259:Infrared Rays; D049329:Nanostructures / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D018036:Selenium Compounds; D001729:Bismuth; C011934:mica