Decisive role of dopants in the optical properties of vertically aligned silicon nanowires prepared by metal-assist chemical etching

2021 ◽  
Vol 121 ◽  
pp. 111632
Author(s):  
Le Thanh Cong ◽  
Nguyen Thi Ngoc Lam ◽  
Doan Van Thuong ◽  
Ngo Ngoc Ha ◽  
Nguyen Duc Dung ◽  
...  
2012 ◽  
Vol 7 (6) ◽  
pp. 602-606 ◽  
Author(s):  
K. A. Gonchar ◽  
L. A. Osminkina ◽  
R. A. Galkin ◽  
M. B. Gongalsky ◽  
V. S. Marshov ◽  
...  

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1106 ◽  
Author(s):  
Kjeldstad ◽  
Thøgersen ◽  
Stange ◽  
Jensen ◽  
Monakhov ◽  
...  

We present a study of the surface effects and optical properties of the self-assembled nanostructures comprised of vertically aligned 5 nm-diameter Al nanowires embedded in an amorphous Si matrix (a-Si:Al). The controlled (partial) removal of Al nanowires in a selective etching process yielded nanoporous a-Si media with a variable effective surface area. Different spectroscopy techniques, such as X-ray photoelectron spectroscopy (XPS), UV-Vis spectrophotometry and photoluminescence (PL), have been combined to investigate the impact of such nanostructuring on optical absorption and emission properties. We also examine long-term exposure to air ambient and show that increasing level of surface oxidation determines the oxide defect-related nature of the dominant PL emission from the nanoporous structures. The role of bulk, nanosize and surface effects in optical properties has been separated and quantified, providing a better understanding of the potential of such nanoporous a-Si:Al structures for future device developments.


ACS Omega ◽  
2017 ◽  
Vol 2 (8) ◽  
pp. 4540-4547 ◽  
Author(s):  
Kanakaraj Rajkumar ◽  
Ramanathaswamy Pandian ◽  
Amirthapandian Sankarakumar ◽  
Ramasamy Thangavelu Rajendra Kumar

2019 ◽  
Vol 90 ◽  
pp. 198-204 ◽  
Author(s):  
Le Thanh Cong ◽  
Nguyen Thi Ngoc Lam ◽  
Nguyen Truong Giang ◽  
Pham The Kien ◽  
Nguyen Duc Dung ◽  
...  

2018 ◽  
Vol 122 (39) ◽  
pp. 22667-22674 ◽  
Author(s):  
Sergio Pinilla ◽  
Rocio Barrio ◽  
Nieves González ◽  
Rafael Pérez Casero ◽  
Francisco Márquez ◽  
...  

Author(s):  
K. E. Stupak ◽  

The article deals with analyzing the main streams of the education policy in Finland, which reflect the relationship between a person and society in modern socio–economic conditions. Such policy directs the system of education to change the person and his mind himself. Finland using its education system, has long before been concerned about preparing people for the future by reforming approaches to teaching in schools and higher education institutions. As a result, it has achieved world–wide recognition and top positions in various ratings have resulted. Therefore, today there is a great interest of scientists in certain issues of education functioning in Finland. Thus, G. Androshchuk, V. Butova. I. Zhernokleeva, T. Pushkareva and others study in their works the purpose and decisive role of Finland's education policy in the development of the education system. S. Grinyuk and V. Zagvozdkin pay attention to the practical the steps of reforming the Finnish system of education. T. Drobyshevsk investigates the system of providing educational services in Finland as a sector of knowledge production. L. Volynets, P. Kukharchuk consider the principles of the state education policy of Finland. L. Smolskaya examines the role of the state policy in implementing the "Finnish phenomenon"; P. Basyliuk and Yu. Kulykova, focus attention on the study of the evolution of the system of higher education in Finland; O. Scherbak reveals peculiarities of vocational education and training.


Author(s):  
Dunja Apostolov-Dimitrijevic

This paper explains political democratization in Post-Milosevic Serbia, utilizing two different accounts of the democratization process: one rooted in the rational choice framework and the other in structuralism. While rational choice explains the decisive role of political leadership in overcoming path dependence, the structuralist explanations show the transnational linkages that encourage democratization in the face of domestic setbacks. This particular debate between the two types of explanations represents the larger debate concerning the role of internal factors and external linkages in propelling democratization in transitional societies. The paper concludes by integrating the two sets of explanations offered by each theoretical perspective, in order to develop a coherent understanding of Serbia's democratization.   Full text available at: https://doi.org/10.22215/rera.v9i1.240


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