Electrical properties of nanoscale heterojunctions formed between GaN and ZnO nanorods

0502998 - ÚFE 2019 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Tiagulskyi, Stanislav - Yatskiv, Roman - Grym, Jan - Schenk, Antonín - Roesel, David - Vaniš, Jan - Hamplová, Marie
Electrical properties of nanoscale heterojunctions formed between GaN and ZnO nanorods.
9TH INTERNATIONAL CONFERENCE ON NANOMATERIALS - RESEARCH & APPLICATION (NANOCON 2017). Ostrava: TANGER, 2018, s. 146-151. ISBN 978-80-87294-81-9.
[9th International Conference on Nanomaterials - Research and Application (NANOCON). Brno (CZ), 18.10.2017-20.10.2017]
Grant CEP: GA ČR(CZ) GA17-00546S; GA ČR(CZ) GA15-17044S
Institucionální podpora: RVO:67985882
Klíčová slova: Scanning electron microscope * Hydrothermal growth * In-situ current-voltage measurements
Obor OECD: Electrical and electronic engineering

Vertical periodic arrays of ZnO nanorods are prepared by hydrothermal growth on GaN templates patterned by focused ion beam. Electro-physical properties of a single vertically-oriented ZnO nanorod are investigated by measuring the current-voltage characteristics using a nanoprobe in a scanning electron microscope. This technique enables to observe the surface morphology of ZnO nanorods simultaneously with their electrical characterization in vacuum. The vacuum chamber rejects the impact of gas adsorption and light irradiation, which both affect the properties of ZnO nanorods. Moreover, mechanical damage and strain induced during the nanorod transfer are eliminated. Nonlinear current-voltage characteristics under the forward bias are explained by the tunneling-recombination process and by the space charge limited current. The high reverse bias current in the p-n heterojunction is attributed to direct tunneling via a narrow tunnel barrier
Trvalý link: http://hdl.handle.net/11104/0294830