Direct hard X-ray photodetector with superior sensitivity based on ZnGa2O4 epilayer grown by metalorganic chemical vapor deposition oleh Siddharth Rana, Shang-Jui Chiu, Chih-Yang Huang, Fu-Gow Tairtan, Yan-Gu Lin, Dong-Sing Wuu, Jitendra Pratap Singh, Guang-Cheng Su, Po-Liang Liu, Ray-Hua Horng