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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou J., Xia Z., Molokeev M. S., Zhang X., Peng D., Liu Q.
Заглавие : Composition design, optical gap and stability investigations of lead-free halide double perovskite Cs2AgInCl6
Место публикации : J. Mater. Chem. A: Royal Society of Chemistry, 2017. - Vol. 5, Is. 29. - P.15031-15037. - ISSN 20507488 (ISSN), DOI 10.1039/c7ta04690a
Примечания : Cited References: 42. - The present work was supported by the National Natural Science Foundation of China (Grants 91622125 and 51572023), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-16-002A3). XZ acknowledges the support from the National Key Research and Development Program of China Grant No. 2016YFB0700700.
Ключевые слова (''Своб.индексиров.''): crystal growth--design for testability--energy gap--optical properties--perovskite--perovskite solar cells--solar absorbers--solar cells--structural design--band gap engineering--direct-gap semiconductor--environmentally benign--hydrothermal crystal growth--hydrothermal reaction--optoelectronic applications--rock salt structures--solar cell absorbers--crystal structure
Аннотация: The discovery of lead-free double perovskites provides a feasible way of searching for air-stable and environmentally benign solar cell absorbers. Herein we report the design and hydrothermal crystal growth of double perovskite Cs2AgInCl6. The crystal structure, morphology related to the crystal growth habit, band structure, optical properties, and stability are investigated in detail. This perovskite crystallized in a cubic unit cell with the space group Fm3m and is composed of [AgCl6] and [InCl6] octahedra alternating in a ordered rock-salt structure, and the as-obtained crystal size is dependent on the hydrothermal reaction time. Cs2AgInCl6 is a direct gap semiconductor with a wide band gap of 3.23 eV obtained experimentally and 3.33 eV obtained by DFT calculation. This theoretically predicted and experimentally confirmed optical gap is a prototype of the band gaps that are direct and optically allowed except at the single high-symmetry k-point, which didn't raise interest before but have potential applications in future technologies. Cs2AgInCl6 material with excellent moisture, light and heat stability shows great potential for photovoltaic and other optoelectronic applications via further band gap engineering. © 2017 The Royal Society of Chemistry.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pyatnov M. V., Bikbaev R. G., Timofeev I. V., Ryzhkov, Ilya I., Vetrov S. Ya., Shabanov V. F.
Заглавие : Tamm plasmons in TiO2 nanotube photonic crystals
Место публикации : Photonics. - 2023. - Vol. 10, Is. 1. - Ст.64. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10010064
Примечания : Cited References: 40. - This research was funded by Russian Science Foundation and Krasnoyarsk Regional Fund of Science, project № 22-22-20078, https://rscf.ru/project/22-22-20078/ (accessed on 01 January 2023)
Аннотация: The anodic TiO2 photonic crystals evoke great interest for application as photocatalytic media due to high absorption of light resuling from their specific structure. In this work, the optical properties of the photonic crystal based on a bamboo-type TiO2 nanotube with a metallic coating are analyzed theoretically by the finite-difference time-domain method. The occurrence of Tamm plasmons that appears as a peak in the absorption spectrum is predicted. A Tamm plasmon polariton is a localized state of light excited at the boundary of two highly reflective media, a metal and a Bragg reflector. The integral absorption of the gold-, titanium-, and titanium nitride-coated photonic crystals in the wavelength range of 450–600 nm is calculated. It is established that the titanium nitride-coated structure exhibits the maximum integral absorption.
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