Project HOMING „Polarity engineering in nitride heterostructures”
HOMING Programme funded by Foundation for Polish Science offers grants to young Doctors who come to Poland (regardless of their nationality) to conduct their postdoctoral research.
The project focuses on nitride vertical devices with inverted built-in polarization fields in structures grown on Ga-polar GaN substrates. To build such devices we will exploit unique features of n-p tunnel junctions (TJ). Growth of n-p TJ preceding the active region of the device allows to incorporate the active region within the p-n configuration rather than the commonly used n-p one. This results in an inverted built-in electric field direction inside the active region. Additionally, such devices will profit from having the n-type layer on the top. We will show that both features can lead to new applications of light emitting devices, laser diodes and transistors. Unique capabilities of the plasma-assisted molecular beam epitaxy system (high growth rate nitrogen plasma source, high Mg flux cell and Ge doping) installed in Warsaw will be crucial for samples growth.
H. Turski, M. Siekacz, G. Muziol, M. Hajdel, S. Stanczyk, M. Zak, M. Chlipala, C. Skierbiszewski, S. Bharadwaj, H.G. Xing, D. Jena, "Nitride LEDs and Lasers with Buried Tunnel Junctions", Ecs Journal of Solid State Science and Technology, 9 (2020) 015018.
A. Chaney, H. Turski, K. Nomoto, Z. Hu, J. Encomendero, S. Rouvimov, T. Orlova, P. Fay, A. Seabaugh, H.G. Xing, D. Jena, "Gallium nitride tunneling field-effect transistors exploiting polarization fields", Applied Physics Letters, 116 (2020) 073502.
S. Bharadwaj, J. Miller, K. Lee, J. Lederman, M. Siekacz, H. Xing, D. Jena, C. Skierbiszewski, H. Turski, "Enhanced injection efficiency and light output in bottom tunnel-junction light-emitting diodes", Optics Express, 28 (2020) 4489.
H. Turski, S. Bharadwaj, H. Xing, D. Jena, "Polarization control in nitride quantum well light emitters enabled by bottom tunnel-junctions", Journal of Applied Physics, 125 (2019) 203104.
G. Muziol, H. Turski, M. Siekacz, K. Szkudlarek, L. Janicki, M. Baranowski, S. Zolud, R. Kudrawiec, T. Suski, C. Skierbiszewski, "Beyond Quantum Efficiency Limitations Originating from the Piezoelectric Polarization in Light-Emitting Devices", Acs Photonics, 6 (2019) 1963-1971.