title: Silicon Substrate Strained and Structured via Cavitation Effect for Photovoltaic and Biomedical Application.
abstract: A hybrid structure, which integrates the nanostructured silicon with a bio-active silicate, is fabricated using the method of MHz sonication in the cryogenic environment. Optical, atomic force, and scanning electron microscopy techniques as well as energy dispersive X-ray spectroscopy were used for the investigation of the morphology and chemical compound of the structured surface. Micro-Raman as well as X-ray diffraction, ellipsometry, and photovoltage spectroscopy was used for the obtained structures characterization. Ellipsometer measurements demonstrated the formation of the layer with the thicknesses ~700 nm and optical parameters closed to SiO2 compound with an additional top layer of the thicknesses ~15 nm and the refractive index ~1. Micro-Raman investigation detects an appearance of Ca-O local vibrational mode, and the stretching vibration of SiO4 chains characterized the wollastonite form of CaSiO3. A significant rise in the value and an expansion of the spectral range of the surface photovoltage for silicon structured via the megasonic processing was found. The concept of biocompatible photovoltaic cell on the base of Si\CaSiO3 structure for the application in bioelectronics was proposed.
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine. r_savkina@lycos.com.
authors.forename: Rada K
authors.initials: RK
authors.lastname: Savkina
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Aleksandr I
authors.initials: AI
authors.lastname: Gudymenko
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Vasyl P
authors.initials: VP
authors.lastname: Kladko
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Andrii A
authors.initials: AA
authors.lastname: Korchovyi
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Andrii S
authors.initials: AS
authors.lastname: Nikolenko
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Aleksey B
authors.initials: AB
authors.lastname: Smirnov
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Tatyana R
authors.initials: TR
authors.lastname: Stara
authors.affiliation: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Prospect Nauky, 41, Kyiv, 03028, Ukraine.
authors.forename: Viktor V
authors.initials: VV
authors.lastname: Strelchuk
keywords: Biocompatibility; Cavitation; Micro- and nanoscale pattern formation; Photovoltaic effect; Silicon substrate