Fig. 2From: Interface-Induced WSe2 In-plane Homojunction for High-Performance PhotodetectionTransfer characteristics. aId-Vg curves of WSe2-S (black line) and WSe2-h (red line). The sweep direction of Vg is indicated by the arrows. b, c Physical explanation for the hysteresis phenomenon. The arrows indicate the direction of electric field induced by Vg. The red and blue spheres represent holes and electrons, respectivelyBack to article page