SEM images depict the morphology of InP NWs along with the statistical graph of kinks. (a) Low-magnification SEM image of InP NWs prepared by 0.5-nm-thick Au film. Kinks with different angles are clearly observed. Approximately 110° kinks indicated by white arrows show frequently. (b) Magnified SEM image shows clear morphology of InP NWs. (c) Typical BF image for angle distribution statistic. (d) Kink angle statistics of grown InP NWs observed by TEM images. Four dominant groups of kinks with angles of approximately 70°, 90°, 110°, and 170° are clearly displayed.