In-plane electric field induced by polarization and lateral photovoltaic effect in a-plane GaN

Weiguo Hu; Bei Ma; Dabing Li; Miyake, Hideto; Hiramatsu, Kazumasa
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p231102
Academic Journal
A lateral photovoltaic effect was observed in a-plane GaN films grown on r-plane sapphire at room temperature. Under various light sources illuminations, contacts along the c-axis exhibited about ten times the photovoltage than those along the m-axis, which kept linear relationship with the illumination intensity. It was attributed to anisotropic in-plane electrical field induced by the intrinsic spontaneous/piezoelectric polarization, which spatially separated photogenerated carriers to produce the photovoltage.


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