TY  - JOUR
AU  - Beyer, Andreas
AU  - Munde, Manveer Singh
AU  - Firoozabadi, Saleh
AU  - Heimes, Damien
AU  - Grieb, Tim
AU  - Rosenauer, Andreas
AU  - Müller-Caspary, Knut
AU  - Volz, Kerstin
TI  - Quantitative Characterization of Nanometer-Scale Electric Fields via Momentum-Resolved STEM
JO  - Nano letters
VL  - 21
IS  - 5
SN  - 1530-6992
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2021-02886
SP  - 2018 - 2025
PY  - 2021
AB  - Most of today’s electronic devices, like solar cells and batteries, are based on nanometer-scale built-in electric fields. Accordingly, characterization of fields at such small scales has become an important task in the optimization of these devices. In this study, with GaAs-based p–n junctions as the example, key characteristics such as doping concentrations, polarity, and the depletion width are derived quantitatively using four-dimensional scanning transmission electron microscopy (4DSTEM). The built-in electric fields are determined by the shift they introduce to the center-of-mass of electron diffraction patterns at subnanometer spatial resolution. The method is applied successfully to characterize two p–n junctions with different doping concentrations. This highlights the potential of this method to directly visualize intentional or unintentional nanoscale electric fields in real-life devices, e.g., batteries, transistors, and solar cells.
LB  - PUB:(DE-HGF)16
C6  - 33621104
UR  - <Go to ISI:>//WOS:000629091100016
DO  - DOI:10.1021/acs.nanolett.0c04544
UR  - https://juser.fz-juelich.de/record/893874
ER  -