發送短信 : Surface composition of MAPb(I <inf>x</inf> Br <inf>1−x</inf> ) <inf>3</inf> (0 ≤ x ≤ 1) organic-inorganic mixed-halide perovskites

 _    _      ___     ______    _    _   __    __  
| \  / ||   / _ \\  |      \\ | || | || \ \\ / // 
|  \/  ||  / //\ \\ |  --  // | || | ||  \ \/ //  
| .  . || |  ___  |||  --  \\ | \\_/ ||   \  //   
|_|\/|_|| |_||  |_|||______//  \____//     \//    
`-`  `-`  `-`   `-` `------`    `---`       `