Efficient Broadband Light-Trapping Structures on Thin-Film Silicon Fabricated by Laser, Chemical and Hybrid Chemical/Laser Treatments

Light-trapping structures formed on surfaces of various materials have attracted much attention in recent years due to their important role in many applications of science and technology. This article discusses various methods for manufacturing light-trapping “black” silicon, namely laser, chemical and hybrid chemical/laser ones. In addition to the widely explored laser texturing and chemical etching methods, we develop a hybrid chemical/laser texturing method, consisting in laser post-texturing of pyramidal structures obtained after chemical etching. After laser treatments the surface morphology was represented by a chaotic relief of microcones, while after chemical treatment it acquired a chaotic pyramidal relief. Moreover, laser texturing of preliminarily chemically microtextured silicon wafers is shown to take five-fold less time compared to bare flat silicon. In this case, the chemically/laser-treated samples exhibit average total reflectance in the spectral range of 250–1100 nm lower by 7–10% than after the purely chemical treatment. © 2023 by the authors.Ministry of Education and Science of the Russian Federation, Minobrnauka; Ministry of Science and Higher Education of the Russian Federation: 075-15-2021-677We thank the Ural Center for Shared Use “Modern nanotechnology” of Ural Federal University (Reg.#2968), which is supported by the Ministry of Science and Higher Education RF (Project #075-15-2021-677) for the provided research equipment; and Evgeny Kuzmin from Lebedev Physical Institute for the preparation .This research was funded by the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program)

ЛУЧЕВАЯ ТЕРАПИЯ НЕРЕЗЕКТАБЕЛЬНОГО РАКА ГОРТАНИ

The treatment outcomes of unresectable laryngeal cancer have been presented. The techniques of radiation therapy (RT) alone and concurrent chemoradiotherapy (CRT), as well as the effect of changes in the fractionation regimens on the treatment outcome have been analyzed. No differences in overall survival (OS) and locoregional control (LC) between the RT and CRT techniques were found (p<0.8). There is a trend toward improvement in OS (p<0.1) and LC (p<0.05) in laryngeal cancer patients treated with hyperftactionated radiation therapy.Представлены результаты лучевого лечения нерезектабельного плоскоклеточного рака гортани. Проанализированы методики самостоятельной лучевой терапии и одновременного химиолучевого лечения, а также влияние изменения режима фракционирования на результаты лечения в целом. Исходя из полученных данных, можно сделать вывод, что между методами только лучевой и химиолучевой терапии нет достоверных различий в показателях как общей выживаемости, так и локорегионарного контроля (p<0,8). Имеется тенденция к улучшению показателей общей выживаемости (p<0,1), а также достоверные данные об увеличении степени локорегионарного контроля (p<0,05) при облучении в режиме гиперфракционирования

RADIATION TREATMENT OF UNRESECTABLE LARYNGEAL CANCER

The treatment outcomes of unresectable laryngeal cancer have been presented. The techniques of radiation therapy (RT) alone and concurrent chemoradiotherapy (CRT), as well as the effect of changes in the fractionation regimens on the treatment outcome have been analyzed. No differences in overall survival (OS) and locoregional control (LC) between the RT and CRT techniques were found (p<0.8). There is a trend toward improvement in OS (p<0.1) and LC (p<0.05) in laryngeal cancer patients treated with hyperftactionated radiation therapy