Nanostructured surfaces

Formation of the nanoporous Si structure of solar cell with using a model representation
Yerokhov V.Yu., Druzinin A.A., Nichkalo S.I.
Department of Semiconductor Electronics, Lviv Polytechnic National University, 
S. Bandera Str., 12, Lviv-79013, Ukraine
E-mail: v.yerokhov@gmail.com

The study of all stages of formation of porous structure on the basis of the selected model and identification of patterns that affect the characteristics of the resulting nano-, meso-, macropores are very important because most parameters of porous layers are laid at the stage of formation of nucleation (or seed) centers. The mechanism of pore formation can be described only by a few known models.
The aim of this work was to develop frontal functional nanolayers of SC (SC) by electrochemical and chemical technologies of porous silicon (PSi) to obtain efficient and cost-effective technological processes in the production of photovoltaic converters of sunlight, which should be adapted to the fabrication processes of silicon SC. In this study, to obtain frontal functional nanolayers of solar cells, a deep analysis of existing models of PSi was made. The described models are suitable for creating an efficient and cost-effective coating based on nanoporous silicon, as well as maximally adapted to the solar cell fabrication processes.
Among the selected and used by us, which can be used in the creation of SC front surfaces and considered to be the most promising, are Lehmann's model [1] and Zhang's model [2]. In fact, the use of these models will contribute to the creation of an efficient and cost-effective nanocoating based on PSi for solar cells. 
The use of a multilayer PSi, obtained on the basis of model representation, will simplify the technological cycle, reduce the cost of the product and increase performance, i.e. will increase the efficiency of SC manufacturing technology [3].

1.	Lehmann V., Ronnebeck S. The physics of macropore formation in low-doped p-type silicon // Journal of The Electrochemical Society.-2004.-146.-P. 2968-2975. 
2.	Zhang X.G. Morphology and formation mechanisms of porous silicon // Journal of The Electrochemical Society.-2004.-151.-P. 69-80.
3.	Ramadan R., Manso-Silvan M., Martin-Palma R.J. Hybrid porous silicon/silver nanostructures for the development of enhanced photovoltaic devices // Journal of Materials Science.-2020.-55.-P. 5458-5470.