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Silver nanowire (Ag NW)-based transparent back electrodes prepared via all solution-process are promising for bifacial and semitransparent perovskite solar cells (PSCs). However, the inadequate electrical contact between the silver nanowires themselves and the contact with substrate leads to reduced overall solar cell performance; meanwhile, serious corrosion of Ag NW in ambient environment restricting the further applications. In this work, polyvinylpyrrolidone (PVP) as a binder in Ag NW electrode significantly enhances the conductivity and transparency at the same time improving the interface electric contact. The PSC with PVP modified Ag NW electrode demonstrated frontside and backside efficiency approaching 18 % and 14.1 % (AM1.5, 1 Sun), respectively, which achieves 82 % efficiency with normal Ag device and bifacial factor of 79 %. The long-term storage stability of PSC is also improved by PVP protection. The final device structure is ITO/Ni O x /MeO/(FA0.92MA0.08)0.95Cs0.05Pb(I0.9Br0.1)3/PEAI/PC61BM/BCP/ Ag NW. This work highlights the method to fabricate robust transparent Ag NW electrode for bifacial perovskite solar cells. • Polyvinylpyrrolidone (PVP) in Ag nanowire (Ag NW) electrode significantly enhances the conductivity and transparency. • PVP modified Ag NW electrode improves the interface electric contact and charge transport of the solar cell. • The Perovskite solar cell (PSC) with PVP modified Ag NW electrode demonstrated high efficiency and bifacial factor. • The long-term storage stability of PSC is also improved by PVP protection. [ABSTRACT FROM AUTHOR]

Using NaBH 4 as reductant, a fast reduction method was developed to synthesize Co x Fe 10-x alloys nanochains with different Fe molar fractions. XRD and SAED investigations reveal as-prepared nanostructures have amorphous features. By annealing at 500 °C, crystalline Co x Fe 10-x alloy nanostructures with similar morphology can be obtained. Magnetic properties reveal that the saturation magnetization and coercivity of the samples strongly depend on the Co/Fe ratio, and the amorphous samples perform lower coercivity and remarkable soft magnetic behavior. The amorphous samples can hold good complementarities between the dielectric loss and the magnetic loss, which are beneficial for the impedance matching. Therefore, the amorphous samples have dramatic enhancement of electromagnetic wave absorption properties compared to the crystallized samples with similar chemical components. In particular, with a thickness of 2 mm, the strongest reflection loss (RL) of amorphous Co 4 Fe 6 alloy based sample is up to −38.7 dB at 15.1 GHz, the effective absorption (RL < −10 dB) bandwidth can reach 6.9 GHz (10.1–17.0 GHz). These results suggest that the amorphous nanostructures may be promising candidates as high efficient electromagnetic wave absorbing materials. [ABSTRACT FROM AUTHOR]