Metal nanoparticle-enhanced photocurrent in GaAs photovoltaic structures with microtextured interfaces

• Published in: Nanoscale research letters 2015-02, Vol.10 (1), p.72-72, Article 72
• Main Authors: Dmitruk, Nicolas L, Borkovskaya, Olga Yu, Mamontova, Iryna B, Mamykin, Sergii V, Malynych, Sergii Z, Romanyuk, Volodymyr R
• Format: Article
• Language: English
• Subjects: Chemistry and Materials Science; Materials Science; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Nanotechnology and nanomaterials (NANO-2014)
• ISSN: 1931-7573; 1556-276X; 1556-276X
• DOI: 10.1186/s11671-015-0786-6

The photocurrent enhancement effect caused by Au and Ag nanoparticles for GaAs-based photovoltaic structures of surface barrier or p-n junction type with microtextured interfaces has been investigated in dependence on the conditions of nanoparticles deposition and, respectively, on the shape and local dielectric environment of obtained nanoparticle arrays. Three nanoparticle deposition methods have been checked: 1) photoinduced chemical deposition of Au from aqueous AuCl 3 solution forming nanowires on the ridges of quasigrating-type surface microrelief, 2) deposition of Ag nanoparticles from colloidal suspension on the GaAs substrate covered with poly(vinylpyridine), and 3) drop and dry deposition of Au/SiO 2 core-shell nanoparticles from aqueous colloid solution. The comprehensive investigation of optical reflectance, photoelectric, and electrical characteristics of the fabricated barrier structures has shown the highest photovoltaic parameters for surface microrelief of quasigrating-type and electroless Au nanoparticle deposition. The analysis of characteristics obtained allowed us also to define the mechanisms of the total photocurrent enhancement.