Regulating the electron transport layer (ETL) has been an effective way to promote the power conversion efficiency (PCE) of perovskite solar cells (PSCs) as well as suppress their hysteresis. Herein, the SnO2 ETL using a cost‐effective modification material rubidium fluoride (RbF) is modified in two methods: 1) adding RbF into SnO2 colloidal dispersion, F and Sn have a strong interaction, confirmed via X‐ray photoelectron spectra and density functional theory results, contributing to the improved electron mobility of SnO2; 2) depositing RbF at the SnO2/perovskite interface, Rb+ cations actively escape into the interstitial sites of the perovskite lattice to inhibit ions migration and reduce non‐radiative recombination, which dedicates to the improved open‐circuit voltage (Voc) for the PSCs with suppressed hysteresis. In addition, double‐sided passivated PSCs, RbF on the SnO2 surface, and p‐methoxyphenethylammonium iodide on the perovskite surface, produces an outstanding PCE of 23.38% with a Voc of 1.213 V, corresponding to an extremely small Voc deficit of 0.347 V.
Lithium-sulfur (Li-S) batteries have currently excited worldwide academic and industrial interest as a next-generation high-power energy storage system (EES) because of their high energy density and low cost of sulfur. However, the commercialization application is being hindered by capacity decay, mainly attributed to the polysulfide shuttle and poor conductivity of sulfur. Here, we have designed a novel dual core-shell nanostructure of S@C@MnO nanosphere hybrid as the sulfur host. The S@C@MnO nanosphere is successfully prepared using mesoporous carbon hollow spheres (MCHS) as the template and then in situ MnO growth on the surface of MCHS. In comparison with polar bare sulfur hosts materials, the as-prepared robust S@C@MnO composite cathode delivers significantly improved electrochemical performances in terms of high specific capacity (1345 mAh g at 0.1 C), remarkable rate capability (465 mA h g at 5.0 C) and excellent cycling stability (capacity decay rate of 0.052% per cycle after 1000 cycles at 3.0 C). Such a structure as cathode in Li-S batteries can not only store sulfur via inner mesoporous carbon layer and outer MnO shell, which physically/chemically confine the polysulfides shuttle effect, but also ensure overall good electrical conductivity. Therefore, these synergistic effects are achieved by unique structural characteristics of S@C@MnO nanospheres.
Fabricating perovskite film with higher crystallinity, smoother surface and less defects is a crucial step to obtain outstanding performance of perovskite solar cells (PSCs). Herein, we introduce anthraquinone modified graphdiyne quantum dots (GDY-AQ QDs) as an additive into the perovskite film. It is suggested that GDY-AQ QDs largely improved perovskite crystallization and reduced defects, resulting in high-quality GDY-AQ QDs perovskite film with excellent humidity and thermal stabilities. The as-fabricated PSCs achieve power conversion efficiency over 21% due to improved film quality and reduced defects. The strategy of molecularly designed GDY-AQ QDs doping presents great potential for the improvement of the performance of PSCs.
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