Hefei University

The long-term stability is indispensable to the commercialization of perovskite solar cells.Here, we propose for the first time an x-y nanosized interaction strategy to improve the stability of perovskite solar cells, which features a perovskite layer interdigitated by an interactive nanorod array (NA) to laterally limit the perovskite crystallization along x-y directions of substrate plane within nanosized inter-gaps between nanorods.Results show that the solar cell resulting from infiltrating CH₃NH₃PbI₃ layer into the Sb₂S₃-NA grown on TiO₂ film exhibits an improved stability against humidity by 86 % than the conventional counterpart device prepared by depositing bulk CH₃NH₃PbI₃ layer on TiO₂ film, where the improved stability originates from the limited migration and rearrangement of Pb²⁺ and I^- ions in x-y nanosized CH₃NH₃PbI₃ crystals by the strong interaction between such-nanosized perovskite crystals and Sb₂S₃ nanorods.Our findings provide a novel approach to prepare the stable perovskite solar cells.

The commercialization of Li-S batteries is constrained by the unstable interface, severe shuttle of polysulfides, and sluggish kinetic conversion reactions. Electrolyte regulation is a straightforward and efficient way to tackle those mentioned issues. Herein, a multifunctional electrolyte additive of 2,5-Dimercapto-1,3,4-thiadiazole (DMTD) is introduced in the ether-based electrolyte, which can be lithiated into Li₂-DMTD when contacted with the Li or Li₂S during the discharge process. The generated Li₂-DMTD can operate as a highly ionic-conducting protective coating on the Li surface, inhibiting the formation of Li dendrites, and increasing interface stability. Then, it is reversibly oligomerized with Li₂S, forming two organosulfur oligomers during the ensuing electrochemical process. Such a modified reaction routine can reduce the shuttle effect and speed up the reaction kinetics of Li₂S at the cathode, preventing cathode passivation and boosting active material utilization. As a result, The Li||Li symmetric cells with DMTD exhibit about 5-fold cycle life than the reference cell under 5 mA cm^-2 current density. Meanwhile, the initial charge voltage of Li||Li₂S battery is greatly decreased from 3.7 V to 3.0 V with DMTD, and the assembled Li-S cell shows an improved capacity retention from 45.7 % to 81.2 % after 320 cycles. Therefore, this work successfully tackled the critical issues by designing functional organosulfur electrolyte additives in LSBs, which provides theoretical guidance for the electrolyte design in LSBs.

Edge information extraction has been extensively utilized in fields such as image pattern recognition.Existing single-pixel edge imaging methods are limited by the fact that obtaining single-edge information per detection sampling and the inability to synchronously capture object images.This paper proposes a virtual convolutional single-pixel imaging method (VC-SPI), which aims at synchronously acquiring multiple-type edge information.The VC-SPI only requires convolution between the modulation pattern during the inversed algorithm and kernels to achieve synchronous acquisition of multiple-type edge information from objects.Amid the synchronous acquisition, the convolution of the modulation patterns is implemented by the computer and not involved in actual experimentsTherefore, real-time multiple-type edge information synchronous acquisition can be realized using VC-SPI with the precondition that the edge types for convolution operation are satisfied.Addnl., VC-SPI also enables imaging of the target object.We exptl. validate the feasibility of the VC-SPI prototype, demonstrating its capability for real-time synchronous acquisition of multiple-type edge information at a video level.The proposed method holds significant application prospects and value in the field of image edge extraction