A CuAlCl 4 doped metal organic framework, CuAlCl 4 @MIL-101, was prepared by introducing CuAlCl 4 into the pores of MIL-101 for the selective adsorption of CO over N 2 . The CuAlCl 4 molecules were evenly distributed into various pores sizes and did not change the intrinsic structure of the MIL-101. Isotherms for CO and N 2 adsorption at 298 K showed that the CO capacity on CuAlCl 4 @MIL-101 was much higher than that on virgin MIL-101, whereas the N 2 capacity decreased. The selectivity for CO over N 2 improved from 4.64 to 31.5 at 298 K and 1 bar. The CuAlCl 4 @MIL-101 adsorbent displayed outstanding CO adsorption stability and the adsorbent could be regenerated by applying a simple vacuum of 4 mmHg.

SummaryThis study looks at investigating the influence of high surface area TiO 2 and MgO-doped TiO 2 aerogel nanomaterials to improve the photovoltaic performance of monocrystalline silicon (mono-Si) solar cells. TiO 2 and MgO-doped TiO 2 anatase nanoaerogels were synthesized via a single-step colloidal homogeneous precipitation sol-gel method in a compact high-pressure hydrogen reactor. TiO 2 -based nanoparticles were encapsulated in ethylene vinyl acetate resins, and the obtained composite solutions were screen printed on the textured surface of the cells. The specific surface area, microstructural, composition, and optical properties of the nanoaerogels were characterized by Brunaur-Emmett-Teller, X-ray powder diffractometer, energy-dispersive X-ray spectroscopy, field emission transmission electron microscope, field emission scanning electron microscope, and ultraviolet-visible spectrophotometry. We observed that the MgO-doped TiO 2 (2% mol) nanoaerogel exhibited a much superior specific surface area (231 m 2 /g) compared with the undoped TiO 2 (154 m 2 /g). Experimental results showed that the calculated relative power conversion efficiency increased by 4.6% for the MgO-doped TiO 2 coating and 3.4% for the undoped TiO 2 under a simulated one-sun illumination. KEYWORDSethylene vinyl acetate, high-pressure hydrogen reactor, MgO-doped TiO 2 nanoaerogel, monocrystalline silicon (mono-Si) solar cells

This work reports on efforts to enhance the photovoltaic performance of standard ptype monocrystalline silicon solar cell (mono-Si) through the application of ultraviolet spectral down-converting phosphors. Terbium-doped gadolinium oxysulfide phosphor and undoped-gadolinium oxysulfide precursor powders were prepared by a controlled hydrothermal decomposition of a urea homogeneous precipitation method.The resulting rare-earth element hydroxycarbonate precursor powders were then converted to the oxysulfide by annealing at 900°C in a sulfur atmosphere. The asprepared phosphors were encapsulated in ethylene vinyl acetate co-polymer resin and applied on the textured surface of solar cell using rotary screen printing. Comparative results from X-ray powder diffraction, field emission scanning electron microscopy, scanning transmission electron microscopy, and photoluminescence spectroscopy studies on the microstructure and luminescent properties of the materials are reported. We also compared the optical reflectance and external quantum efficiency response of the cells with and without a luminescent phosphor layer. The results obtained on the terbium-doped gadolinium oxysulfide phosphor show clearly that the down-conversion effect induced by the terbium dopant play a crucial role in enhancing the photovoltaic cells' performance. Under an empirical one-sun illumination, the modified cells showed an optimum enhancement of 3.6% (from 16.43% to 17.02%) in conversion efficiency relative to bare cells. In the concentration range of 1 to 2.5 mg/mL, EVA/Gd 2 O 2 S (blank) composites also improve electrical efficiency, but not as much as EVA/Gd 2 O 2 S:Tb 3+ composites.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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The organic light emitting diodes with the structure of ITO/NPB(60 nm)/ Alq3 ∶Rubrene(1wt%,20 nm)/Alq3(3 nm)/Alq3:Rubrene(1wt%,20 nm)/ Alq3(20 nm)/LiF/Al, which have multiple quantum well structures (MQW), were fabricated and the magnetic field effects on the efficiency and current of the OLEDs were measured. The experiment showed that the current decreased monotoniocally, i.e. the resistance of the device increased under the magnetic field. At the same time, the magnetic field effect on efficiency was achieved. The changing ratio of efficiency increased 9.13% maximally when the magnetic field was below 20 mT. The changing ratio of efficiency decreased with the magnetic field increasing when the magnetic field was higher than 20 mT.

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