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Though Sn‐Pb alloyed perovskite solar cells (PSCs) achieved great progress, there is a dilemma to further increase Sn for less‐Pb requirement. High Sn ratio (>70%) perovskite exhibits nonstoichiometric Sn:Pb:I at film surface to aggravate Sn2+ oxidation and interface energy mismatch. Here, ternary metal alloyed (FASnI3)0.7(MAPb1−xZnxI3)0.3 (x = 0–3%) is constructed for Pb% < 30% perovskite....
Tradition financial studies on asset pricing focused on the economic indicators and media information of a stock. Recent financial studies found that the momentum spillovers of relevant firms are salient as well for measuring asset risk. However, previous studies on asset pricing via machine learning only relied on partial of these market information types. In this study, a deep learning framework...
The set pair analysis theory was applied in the water security evaluation due to the existing uncertain relationship in the system. Connection degree is used to describe this sort of uncertain problem. In the process, the indexes information of the region water security was reflected and the difficulty of weight allocation was avoided. The water security of Shandong province was evaluated by this...
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