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1 2020

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Optimization of p-type contacts to InGaN-based laser diodes and light emitting diodes grown by plasma assisted molecular beam epitaxy

Nowakowski-Szkudlarek Krzesimir, Muziol Grzegorz, Żak Mikolaj, Hajdel Mateusz, Siekacz Marcin, Feduniewicz-Żmuda Anna, Skierbiszewski Czesław

Optica Applicata

2020

Vol. 50, nr 2

323--330

We investigated the influence of the In0.17Ga0.83N:Mg contact layer grown by plasma assisted molecular beam epitaxy on the resistivity of p-type Ni/Au contacts. We demonstrate that the Schottky barrier width for p-type contact is less than 5 nm. We compare circular transmission line measurements with a p-n diode current-voltage characteristics and show that discrepancies between these two methods can occur if surface quality is deteriorated. It is found that the most efficient contacts to p-type material consist of In0.17Ga0.83N:Mg contact layer with Mg doping levelas high as 2 × 1020 cm–3.