I-V curve hysteresis induced by gate-free charging of GaAs nanowires' surface oxide

P. A. Alekseev, P. Geydt, M. S. Dunaevskiy, E. Lähderanta, T. Haggrén, J. P. Kakko, H. Lipsanen

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

7 Цитирования (Scopus)

Аннотация

The control of nanowire-based device performance requires knowledge about the transport of charge carriers and its limiting factors. We present the experimental and modeled results of a study of electrical properties of GaAs nanowires (NWs), considering their native oxide cover. Measurements of individual vertical NWs were performed by conductive atomic force microscopy (C-AFM). Experimental C-AFM observations with numerical simulations revealed the complex resistive behavior of NWs. A hysteresis of current-voltage characteristics of the p-doped NWs as-grown on substrates with different types of doping was registered. The emergence of hysteresis was explained by the trapping of majority carriers in the surface oxide layer near the reverse-biased barriers under the source-drain current. It was found that the accumulation of charge increases the current for highly doped p+-NWs on n+-substrates, while for moderately doped p-NWs on p+-substrates, charge accumulation decreases the current due to blocking of the conductive channel of NWs.

Язык оригиналаанглийский
Номер статьи132104
ЖурналApplied Physics Letters
Том111
Номер выпуска13
DOI
СостояниеОпубликовано - 25 сен 2017
Опубликовано для внешнего пользованияДа

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