Enhancing the intrinsic p-type conductivity of the ultra-wide bandgap Ga2O3 semiconductor

Ekaterine Chikoidze (1) , Corinne Sartel (1) , Hagar Mohamed , Ismail Madaci , Tamar Tchelidze , Mircea Modreanu , Pablo Vales-Castro , Carles Rubio , Christophe Arnold (1) , Vincent Sallet (1) , Yves Dumont (1) , Amador Pérez-Tomás

1 GEMAC - Groupe d'Etude de la Matière Condensée

While there are several n-type transparent semiconductor oxides (TSO) for optoelectronic applications (e.g. LEDs, solar cells or display TFTs), their required p-type counterparts oxides are known to be more challenging. For the time being, the n-type TSO with the largest bandgap (~5eV) is Ga2O3 that holds the promisse of extending the light transparency further into the deep ultraviolet. In this work, it is demonstrated that strongly compensated Ga2O3 is also the intrinsic (or native) p-type TSO with the largest bandgap for any reported p-type TSO (e.g. NiO, SnO, delafossites, oxychalcogenides). The achievement of hole mobility in excess of 10 cm 2 /Vs and (high temperature) free hole concentrations in the ~10 17 cm-3 range challenges the current thinking about achieving p-type conductivity in Ga2O3 being "out of question". The results presented in this paper therefore further clarify that p-type Ga2O3 is possible, although more research must be conducted to determine what are the real Ga2O3 prospects for solar blind bipolar optoelectronics and ultrahigh power electronics based in p-n homojunctions.

Domaines: Physique [physics]; Matière Condensée [cond-mat]

Ekaterine Chikoidze, Corinne Sartel, Hagar Mohamed, Ismail Madaci, Tamar Tchelidze, et al.. Enhancing the intrinsic p-type conductivity of the ultra-wide bandgap Ga2O3 semiconductor. Journal of Materials Chemistry C, 2019, 7 (33), pp.10231-10239. ⟨10.1039/C9TC02910A⟩. ⟨hal-02398031⟩