{'fraction_non_alphanumeric': 0.02580999450851181, 'fraction_numerical': 0.004393190554640308, 'mean_word_length': 5.073333333333333, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
MODELING OF TEMPERATURE DISTRIBUTION IN THE STRUCTURE A-SI-SN-A-SI AT LASER IRRADIATION

The film composite «Si nanocrystals in the matrix of amorphous Si» (nc-Si) is considered a promising material for the next generation of solar cells (CE) at quantum dots [1, p. 951]. Among the main problems that inhibit the practical implementation of the advantages of nc-Si is the insufficient development of technologies for controlling the size and concentration of Si nanocrystals at economically justified film formation rates. The distribution of temperature profiles, which arises during laser irradiation, plays an important role in the formation of nanocrystals in the a-Si-Sn system. Therefore, the aim of this work is to determine the temperature and time parameters of metalinduced crystallization (MIC) in such a system, as well as the prospects of using pulsed laser radiation to regulate the size and concentration of nanocrystals in tin-induced crystallization of amorphous silicon. When describing the process of laser heating of a substance, two circumstances are significant. First, due to the penetration of light into the environment, optical heat sources should be volumetric, is distributed in the volume of the medium, and not localized, for example, at its boundary, as in the problems of ordinary thermal heating. Second, the release of optical energy is heterogeneous in the amount of interaction due to the decrease in light intensity as it penetrates deep into the environment. The latter circumstance leads to spatially inhomogeneous heating of the substance and determines the processes of heat and mass transfer between different parts of the environment. The propagation of the temperature field on the surface of a solid body when heated by a laser pulse can be represented as follows [2, p. 714]: