Chen, X., Dong, J., He, C., He, L., Chen, Z., Li, S., Zhang, K., Wang, X. and Wang, Z.L. 2021. Epitaxial Lift-Off of Flexible GaN-Based HEMT Arrays with Performances Optimization by the Piezotronic Effect. Nano-Micro Letters. 13, (Feb. 2021), 67. DOI:https://doi.org/10.1007/s40820-021-00589-4.