Organic-inorganic hybrid perovskite solar cells have generated wide interest due to the rapid development of their photovoltaic conversion efficiencies. However, the majority of the reported devices have been fabricated via spin coating with a device area of < 1 cm 2. In this study, we fabricated a wide-bandgap formamidinium lead bromide (FAPbBr 3) film using a cost-effective, high-yielding doctor-blade-coating process. The effects of different surfactants, such as l-α-phosphatidylcholine, polyoxyethylene sorbitan monooleate, sodium lauryl sulfonate, and hexadecyl trimethyl ammonium bromide, were studied during the printing process. Accompanying the optimization of the blading temperature, crystal sizes of over 10 mm and large-area perovskite films of 5 cm  5 cm were obtained using this method. The printed FAPbBr 3 solar cells exhibited a short-circuit current density of 8.22 mA/cm 2 , an open-circuit voltage of 1.175 V, and an efficiency of 7.29%. Subsequently, we replaced the gold with silver nanowires as the top electrode to prepare a semitransparent perovskite solar cell with an average transmittance (400-800 nm) of 25.42%, achieving a highpower efficiency of 5.11%. This study demonstrates efficient doctor-blading printing for preparing large-area FAPbBr 3 films that possess high potential for applications in building integrated photovoltaics.
This paper presents a novel wideband high gain rectenna (rectifying antenna) for RF energy harvesting. The proposed device consists of a double-sided antenna, a low-pass filter and a doubling rectifying circuit using Shottcky diodes as rectifying elements. It works over the frequency range from 1.9 to 3.2 GHz. The simulated results demonstrate that the maximum rectenna conversion efficiency is nearly 70% around 2.4 GHz with the incident power density of 50 μW/cm 2 . The overall rectenna conversion efficiency within the operational bandwidth is greater than 50%.Index Terms -Rectenna, wireless energy harvesting, dipoles, the antenna with a low-pass filter (ALPF) and rectenna conversion efficiency.
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