A detailed investigation is presented for Love waves （LWs） with thick viscoelastic guiding layers. A theoretical calculation and an experiment are carried out for LW devices incorporating an SU-8 guiding layer, an S...A detailed investigation is presented for Love waves （LWs） with thick viscoelastic guiding layers. A theoretical calculation and an experiment are carried out for LW devices incorporating an SU-8 guiding layer, an ST-90° X quartz substrate and two 28-μm periodic interdigital transducers. Both the calculated and the measured results show an increase in propagation velocity when h / λ〉0.05. The measured insertion loss of LWs is consistent with the calculated propagation loss. The insertion loss of bulk waves is also measured and is compared with that of LWs.展开更多
Over the last decade,perovskite solar cells(PSCs)have drawn extensive atten-tion owing to their high power conversion efficiency(single junction:26.1%,perovskite/silicon tandem:33.9%)and low fabrication cost.However,t...Over the last decade,perovskite solar cells(PSCs)have drawn extensive atten-tion owing to their high power conversion efficiency(single junction:26.1%,perovskite/silicon tandem:33.9%)and low fabrication cost.However,the short lifespan of PSCs with initial efficiency still blocks their practical applications.This operational instability may originate from the intrinsic and extrinsic deg-radation of materials or devices.Although the lifetime of PSCs has been prolonged through component,crystal,defect,interface,encapsulation engineering,and so on,the systematic analysis of failure regularity for PSCs from the perspective of materials and devices against multiple operating stressors is indispensable.In this review,we start with elaboration of the predominant degradation pathways and mechanism for PSCs under working stressors.Then the strategies for improving long-term durability with respect to fundamental materials,interface designs,and device encapsulation have been summarized.Meanwhile,the key results have been discussed to understand the limitation of assessing PSCs stability,and the potential applications in indoor photovoltaics and wearable electronics are demonstrated.Finally,promising proposals,encompassing material processing,film formation,interface strengthening,structure designing,and device encapsulation,are provided to improve the operational stability of PSCs and promote their commercialization.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 11104314
文摘A detailed investigation is presented for Love waves （LWs） with thick viscoelastic guiding layers. A theoretical calculation and an experiment are carried out for LW devices incorporating an SU-8 guiding layer, an ST-90° X quartz substrate and two 28-μm periodic interdigital transducers. Both the calculated and the measured results show an increase in propagation velocity when h / λ〉0.05. The measured insertion loss of LWs is consistent with the calculated propagation loss. The insertion loss of bulk waves is also measured and is compared with that of LWs.
基金supported by the National Natural Science Foundation of China(Grant Nos.22005131 and 52171369)Shanxi Scholarship Council of China(Grant No.2020-140)+1 种基金Natural Science Foundation of Jiangxi Province(Grant Nos.22005131 and 52171369)Shanxi Scholarship Council of China(Grant Nos.20212BAB214055 and 20224ACB204007).
文摘Over the last decade,perovskite solar cells(PSCs)have drawn extensive atten-tion owing to their high power conversion efficiency(single junction:26.1%,perovskite/silicon tandem:33.9%)and low fabrication cost.However,the short lifespan of PSCs with initial efficiency still blocks their practical applications.This operational instability may originate from the intrinsic and extrinsic deg-radation of materials or devices.Although the lifetime of PSCs has been prolonged through component,crystal,defect,interface,encapsulation engineering,and so on,the systematic analysis of failure regularity for PSCs from the perspective of materials and devices against multiple operating stressors is indispensable.In this review,we start with elaboration of the predominant degradation pathways and mechanism for PSCs under working stressors.Then the strategies for improving long-term durability with respect to fundamental materials,interface designs,and device encapsulation have been summarized.Meanwhile,the key results have been discussed to understand the limitation of assessing PSCs stability,and the potential applications in indoor photovoltaics and wearable electronics are demonstrated.Finally,promising proposals,encompassing material processing,film formation,interface strengthening,structure designing,and device encapsulation,are provided to improve the operational stability of PSCs and promote their commercialization.
