Mechanical Analysis for Two-layered Ultrahigh Pressure Apparatus with Interlayer Pressure

To improve the bearing pressure capacity of ultrahigh pressure apparatus,the internal autofrettaged cylinder with interlayer pressure(ACCIP)is introduced,and the analytical model for the ACCIP structure and its derivation are presented as well.Calculation showed that the ACCIP method enhance bearing pressure of the apparatus obviously;optimization results revealed that under the working pressure pw=1.07σs and different radius ratios,the ACCIP method can keep the apparatus in deformed-elastically state;And when the pw=1.07σs,the minimum radius ratio was approximate 3.29,in this case,no yielding happened.The above results demonstrate that the ACCIP method is a promising technique to improve the bearing pressure of ultrahigh pressure apparatus,and the analytical model for the ACCIP method is also reasonable.In addition,the minimum radius ratio ro/ri under randomly specified workload can be Fig.d out by the analytical model proposed in this work.

Low-dimensional metal halide perovskites and related optoelectronic applications

Low-dimensional materials have pivotal significance in modern photonic,electronic,and optoelectronic areas due to their unique properties of the scale effect.Metal halide perovskites have revived in the optoelectronic fields recently,drawing intensive attention in photovoltaic devices,light-emitting diodes,lasers,photodetectors,and so on.Compared to their three-dimensional counterparts,the role of low-dimensional perovskites is becoming crucial,requiring a comprehensive understanding and exploration unceasingly.In this review,we examine low-dimensional perovskite of different forms and clarify various synthesis methods with morphological and dimensional control.Additionally,we also summarize potential optoelectronic applications based on their advantageous optical/electrical properties and enhanced mechanical integrity and stability.Finally,we propose a future perspective and possible developing directions in the exploration of novel perovskite-derived materials,new physics,and promising applications.

Research progress of low-dimensional perovskites:synthesis,properties and optoelectronic applications

The lead halide-based perovskites,for instance,CH3NH3PbX3 and CsPbX3（X = Cl,Br,I）,have received a lot of attention.Compared with bulk materials,low-dimensional perovskites have demonstrated a range of unique optical,electrical and mechanical properties,which enable wide applications in solar cells,lasers and other optoelectronic devices.In this paper,we provide a summary of the research progress of the low-dimensional perovskites in recent years,from synthesis methods,basic properties to their optoelectronic applications.

Thermal-stable mixed-cation lead halide perovskite solar cells

As perovskite solar cells show tremendous potential for widespread applications, we find that adding inorganic thermal-stable cesium ions into MAPbI_3 results in significantly improves thermal stability. For un-encapsulated perovskite devices, the energy conversion efficiency maintains about 75% of its original value（over 15%） in the MA_（0.85）Cs_（0.05）PbI_3 device under 80 min of heating at 140°C in a dry atmosphere（RH ≤ 30%）. With significantly improved thermal stability achieved by a convenient process, it is expected that this type of mixed-cation perovskites can further facilitate large scale applications.