Investigation of spatial distribution of photocurrent in the plane of a Si p–n photodiode with GeSi nanoislands by scanning near-field optical microscopy
- Authors: Filatov D.O.1, Kazantseva I.A.1, Shengurov V.G.1, Chalkov V.Y.1, Denisov S.A.1, Gorshkov A.P.1, Mishkin V.P.2
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Affiliations:
- Lobachevsky State University of Nizhny Novgorod
- Ogarev Mordovia State University
- Issue: Vol 51, No 4 (2017)
- Pages: 536-541
- Section: Fabrication, Treatment, and Testing of Materials and Structures
- URL: https://journals.rcsi.science/1063-7826/article/view/199800
- DOI: https://doi.org/10.1134/S1063782617040042
- ID: 199800
Cite item
Abstract
The spatial distribution of photocurrent in the plane of a Si-based p+–n junction with embedded self-assembled GexSi1–x (x ≈ 0.35) nanoislands is studied by scanning near-field optical microscopy with local photoexcitation by a microscope probe at an emission wavelength of 1310 nm (larger than the intrinsicphotosensitivity red edge for Si). Inhomogeneities related to interband optical absorption in separate GeSi nanoislands are observed in the photocurrent images (maps of the spatial distribution of the photocurrent in the input-window plane of the p+–n photodiodes). The results of this study demonstrate the possibility of visualizing individual GeSi nanoislands in images of the photocurrent with a spatial resolution of ~100 nm.
About the authors
D. O. Filatov
Lobachevsky State University of Nizhny Novgorod
Author for correspondence.
Email: Dmitry_filatov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
I. A. Kazantseva
Lobachevsky State University of Nizhny Novgorod
Email: Dmitry_filatov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
V. G. Shengurov
Lobachevsky State University of Nizhny Novgorod
Email: Dmitry_filatov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
V. Yu. Chalkov
Lobachevsky State University of Nizhny Novgorod
Email: Dmitry_filatov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
S. A. Denisov
Lobachevsky State University of Nizhny Novgorod
Email: Dmitry_filatov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
A. P. Gorshkov
Lobachevsky State University of Nizhny Novgorod
Email: Dmitry_filatov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
V. P. Mishkin
Ogarev Mordovia State University
Email: Dmitry_filatov@inbox.ru
Russian Federation, Saransk, 430005