File Name : fig s1.tif

Caption : figure s1. (a) sem image of broken gan crystal. (b) sem images of gan crystal array embedded in pdms and mechanically exploited from the substrate. 

File Name : fig s2.tif

Caption : figure s2. top: tem image (left panel) and corresponding eds analysis result (right panel). bottom: the corresponding elemental mapping images of ga (green), n (purple), c (blue) and o (yellow). 

File Name : fig s3.tif

Caption : figure s3. room temperature pl spectrum of n-type gan crystals.