“…The ideality factors greater than unity are attributed to secondary mechanisms at the interface [4][5][6][7][8][9]33,34]. For example, interface defects may lead to a lateral inhomogeneous distribution of barrier heights at the interface which then results in larger ideality factors, and the charge transport across the interface only is no longer due to thermionic emission [1][2][3][4][5][6][7][8][33][34][35][36][37].…”