Regulated dynamics with two-monolayer steps in vapor-solid-solid growth of nanowires

Bellet‐Amalric, E.; Panciera, Federico; Patriarche, G.; Travers, Laurent; Hertog, M. den; Harmand, Jean-Christophe; Cibert, J.

doi:10.48550/arxiv.2112.06493

Cited by 1 publication

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“…A paucity of NW species in the catalyst also occurs in vapor-solid-solid NW growth, and we believe that this is the reason for the observation of selfregulation effects in this mode as well. [48] On the experimental side, the next steps will thus be to record growth sequences using a faster camera (although this could reduce the signal to noise ratio and thwart the precise detection of ML nucleation and completion) and to track down possible residual instabilities of our growth conditions. In parallel, we will attempt to understand if some intrinsic fluctuations so far neglected might hinder the achievement of the quasideterministic growth regime.…”

Section: Discussionmentioning

confidence: 99%

Statistics of Nucleation and Growth of Single Monolayers in Nanowires: Towards a Deterministic Regime

Panciera

Harmand

2022

Physica Rapid Research Ltrs

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The vapor–liquid–solid growth of semiconductor nanowires proceeds via the sequential nucleation and extension of biatomic monolayers at the interface between the solid wire and a liquid catalyst nanodroplet. In the case of III–V compounds, this mother phase contains only a small concentration of the volatile group V atoms. The growth regime where there is not enough such atoms available in the liquid at nucleation to complete a whole monolayer is studied experimentally and theoretically. Each monolayer cycle then consists in the rapid formation of a partial monolayer, followed by a slower propagation stage and by a waiting time preceding the next nucleation. The propagation and waiting times of long sequences of monolayers are measured in situ in a transmission electron microscope at three growth temperatures, in a single GaAs nanowire. The process is modeled and the statistics of the characteristic times are computed numerically and analytically. At low temperature, the weakness of group V desorption from the liquid should lead to a constant total monolayer cycle time, despite the stochasticity of the nucleation events. The modeling of the experiments yields values of several crucial growth parameters and provides guidance for the growth of nanowires in a deterministic regime.

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Section: Discussionmentioning

confidence: 99%