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

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Chikoidze, Ekaterine
Sartel, Corinne
Mohamed, Hagar
Tchelidze, Tamar
Modreanu, Mircea
Vales-Castro, Carlo
Rubio, Carles
Arnold, Christophe
Sallet, Vincent
Dumont, Yves
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Royal Society of Chemistry
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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 cm2/Vs and (high temperature) free hole concentrations in the ~1017 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 ultra-high power electronics based in p-n homojunctions.
p-type Ga2O3 , Solar blind bipolar optoelectronics , Ultra-high power electronics , p-n homojunctions
Chikoidze, E., Sartel, C., Mohamed, H., Tchelidze, T., Modreanu, M., Vales-Castro, C., Rubio, C., Arnold, C., Sallet, V., Dumont, Y. and Perez-Tomas, A. (2019) 'Enhancing the intrinsic p-type conductivity of the ultra-wide bandgap Ga2O3 semiconductor', Journal of Materials Chemistry C. doi: 10.1039/C9TC02910A
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