High uniformity of hydrophobic F4-TCNQ doping in the spiro-OMeTAD layer hinders the dopant migration towards the anode as well as the dopant aggregation, leading to a T₈₀ shelf-lifetime of >1 year.

Precise adaptation of the greenhouse lighting spectrum to basic photophysiological processes can effectively and directionally stimulate plant growth and development. The optimal spectrum depends on the plant species and the stage of development and could be assessed empirically. The aim of this study is to determine the LED illumination spectrum that provides a significant improvement in the growth rate and accumulation of biologically active compounds for basil plants (Ocimum basilicum L.) under hydroponic cultivation compared to more traditional lighting sources. The following light sources with various emission spectra were used: an LED lamp within a spectral range of 400–800 nm (B:G:R 15%:5%:80%); a high-pressure sodium lamp (HPS) (B:G:R 5%:45%:50%); a compact fluorescent lamp (B:G:R 20%:40%:40%); a grow LED strip (B:G:R 15%:40%:45%); a white LED lamp (B:G:R 30%:45%:25%); a customized LED lighting setup in color ratios 100%B, 75%B + 25%R, 50%B + 50%R, 25%B + 75%R, 100%R, and natural lighting. A photosynthetic photon flux density (PPFD) of 150 μmol∙m⁻²∙s⁻¹ was provided with all the sources. It was demonstrated reliably that employing the LED strip as an illumination device gives a 112% increase in basil plant yield compared to the HPS; the transpiration coefficient for the LED strip is six times lower than for the HPS. The content of flavonoids in the basil aerial parts on the 30th, 50th, and 70th days of development is 3.2 times higher than for the HPS; the metabolite composition is also more uniform for LED strip lighting.

The issues of the perovskite degradation and the stability of perovskite solar cells are studied in this article. The method of vacuum thermal deposition, spray pyrolysis, and spin-coating methods are adopted for the fabrication of different constituents of solar cells to achieve good reproducibility and long lifetime for samples with high efficiency. The applied one-step coating method for creation of perovskite layer is described in detail. It is investigated what exactly leads to the degradation of perovskite solar cells under constant sunlight illumination, because this seems to be one of the biggest obstacles to their commercialization.

In this research we have created light-emitting structures that contain colloidal quantum dots of cadmium selenide in the active layer. To do so, we have used methods of vacuum thermal deposition and spin coating for the formation of organic layers. We have compared photo- and electroluminescence spectra of the structures, and have revealed necessary conditions for the creation of high quality layers.

Subject of study. Solar cells based on CsPbI₃ and CsPbBr₃ photosensitive inorganic perovskites are investigated. Aim of study. The study aimed to simulate and fabricate inorganic perovskite solar cells based on CsPbI₃ and CsPbBr₃. Method. A theoretical study was conducted using the open-source AFORS-HET program, which is designed for one-dimensional modeling of solar cells and other optoelectronic devices. During the fabrication of the structures, various equipment, including an EZ4 spin coater for thin film and photoresist deposition, ULAB US-1500D heated laboratory magnetic stirrers, and a vacuum thermal deposition station, was employed. Main results. Solar cells based on CsPbI₃ and CsPbBr₃ photosensitive inorganic perovskites were simulated using the AFORS-HET software. The primary photovoltaic cell parameters, including the fill factor, short-circuit current, open-circuit voltage, and efficiency, were estimated. A theoretical analysis was performed to identify the factors and defects in the perovskite films affecting the solar cells’ performance. Based on the simulation results, photosensitive structures using CsPbI₃ were fabricated and characterized. Practical significance. The studied solar cells based on CsPbI₃ and CsPbBr₃ exhibit potential as efficient solar-to-electrical energy converters.