Influence of the crosstalk on the intensity of HAADF ‐STEM images of quaternary semiconductor materials

SummaryThe influence of the neighbouring atomic ‐columns in determining the composition at atomic column scale of quaternary semiconductor compounds, using simulated HAADF‐STEM images is evaluated. The InAlAsSb alloy, a promising material in the photovoltaic field, is considered. We find that the so called ‘crosstalk’ effect plays an impo rtant role for the aimed compositional determination. The intensity transfer is larger from neighbouring atomic columns with higher average Z, and towards atomic columns with smaller Z. Our results show that in order to obtain precise information on the column composition, the HAADF‐STEM intensiti es of both columns need to be taken into account simultaneously.

Source: Journal of Microscopy - November 12, 2018 Category: Laboratory Medicine Authors: N. BALAD ÉS, M. HERRERA, D. L. SALES, M.P. GUERRERO, E. GUERRERO, P.L. GALINDO, S. I. MOLINA Tags: Original Article Source Type: research