Low-Temperature Growth of Two-Dimensional Layered Chalcogenide Crystals on Liquid

The growth of high-quality two-dimensional (2D) layered chalcogenide crystals is highly important for practical applications in future electronics, optoelectronics, and photonics. Current route for the synthesis of 2D chalcogenide crystals by vapor deposition method mainly involves an energy intensive high temperature growth process on solid substrates, often suffering from inhomogeneous nucleation density and grain size distribution. Here, we first demonstrate a facile vapor-phase synthesis of large-area high-quality 2D layered chalcogenide crystals on liquid metal surface with relatively low surface energy at a growth temperature as low as similar to 100 degrees C. Uniform and large-domain-sized 2D crystals of GaSe and GaxIn1-xSe grown on liquid metal surface even supported on a polyimide film. As-grown 2D GaSe crystals have been fabricated to flexible photodetectors, showing high photoresponse and excellent flexibility. Our strategy of energy-sustainable low-temperature growth on liquid metal surface may open a, route to the synthesis of high-quality 21) crystals of Ga-, In-, Bi-, Hg-, Pb-, or Sn-based chalcogenides and halides.National Natural Science Foundation of China [21525310, 51222202, 51472215]; National Basic Research Program of China [2014CB932500, 2015CB921000]; National Program for Support of Top-Notch Young ProfessionalsSCI(E)ARTICLEhlpeng@pku.edu.cn32103-21071