Blue To True Green Leds With Semipolar Quantum Wells Based On Gan Nanostripes

Recent advances of the performance of GaN based devices with semipolar quantum wells have been realized homoepitaxially on pseudo bulk substrates which are typically small in size and high in cost. These limitations fuel the search for cheap and large area alternatives. Heteroepitaxial growth on sapphire substrates is well established with excellent results for polar GaN structures - the growth of semipolar gallium nitride on sapphire, however, presents unique challenges. In order to profit from our expertise in c-plane samples, our semipolar gallium nitride growth experiments are based on growth in c-direction. Using selective area epitaxy (SAE) on c-oriented templates, we can grow 3D structures with semipolar side facets. These structures are typically several mu m in size which constitutes further challenges for device processing. Reducing the size of the structures to a sub-mu m scale, we are able to bury our semipolar QWs within planar layers resulting in flat samples with c-plane surfaces. In this contribution, we present our results concerning the structural quality and spectral properties of quantum wells emitting in the blue and green spectral range as well as light emitting diodes. (c) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim