Imaging of built-in electric field at a p-n junction by scanning transmission electron microscopy

Naoya Shibata, Scott D. Findlay, Hirokazu Sasaki, Takao Matsumoto, Hidetaka Sawada, Yuji Kohno, Shinya Otomo, Ryuichiro Minato, Yuichi Ikuhara

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

Precise measurement and characterization of electrostatic potential structures and the concomitant electric fields at nanodimensions are essential to understand and control the properties of modern materials and devices. However, directly observing and measuring such local electric field information is still a major challenge in microscopy. Here, differential phase contrast imaging in scanning transmission electron microscopy with segmented type detector is used to image a p-n junction in a GaAs compound semiconductor. Differential phase contrast imaging is able to both clearly visualize and quantify the projected, built-in electric field in the p-n junction. The technique is further shown capable of sensitively detecting the electric field variations due to dopant concentration steps within both p-type and n-type regions. Through live differential phase contrast imaging, this technique can potentially be used to image the electromagnetic field structure of new materials and devices even under working conditions.

Original languageEnglish
Article number10040
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Jun 12
Externally publishedYes

ASJC Scopus subject areas

  • General

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