Here,a novel strategy is proposed targeting the volatility of A-site cations and the disordered arrangement of perovskite grains through employing Cs~+contained metal-organic frameworks In-aip(Cs)obtained by ion-excha...Here,a novel strategy is proposed targeting the volatility of A-site cations and the disordered arrangement of perovskite grains through employing Cs~+contained metal-organic frameworks In-aip(Cs)obtained by ion-exchange and crystalline transform.Interatomic forces between Cs-O atoms split the pore channels of the pristine In-aip,endowing In-aip(Cs)with multidimensional charge transport channels,In addition,the partially freed Cs~+in the interlayer compensates for the vacancy of A-site cations during the perovskite preparation process.The In-aip(Cs)modified perovskite films have a flat morphology,large grains and excellent optoelectronic properties.Benefiting from the high-quality perovskite films and faster charge extraction,the In-aip(Cs)-modified PSCs achieved a champion PCE of 23.03%,superior to the In-aip-modified(22.29%)and control device(21.13%),More importantly,the unencapsulated PSCs modified with In-aip(Cs)exhibited outstanding humidity and thermal stability.Over a period of almost 1000 h,the unencapsulated In-aip(Cs)-modified device retained 85%of its initial PCE after storing in a glove box at 85℃,and retained 87%of the primary PCE upon storage in ambient condition at 25℃under a humidity of 40%.展开更多
Introducing a combination of transcription factors such as Oct4,Sox2,Klf4 and c-Myc（OSKM）enables reprogramming which converts somatic cells into induced pluripotent stem cells（i PSCs）（Takahashi and Yamanaka,2006...Introducing a combination of transcription factors such as Oct4,Sox2,Klf4 and c-Myc（OSKM）enables reprogramming which converts somatic cells into induced pluripotent stem cells（i PSCs）（Takahashi and Yamanaka,2006）.i PSCs play an important role in clinical and regenerative medicine because they can be utilized to model a specific disease or differentiate into functional cells for transplantation.Enhancing the efficiency of induction and improving the qualities of iPSCs are constant themes in this field.展开更多
PSCO对某国际航行货轮开展PSC检查,检查中发现船舶训练手册中关于消防设施操作的内容与船舶布置不相符,开具缺陷如下:07124 The information/instruction regarding the operation of firefighting equipment and appliances included i...PSCO对某国际航行货轮开展PSC检查,检查中发现船舶训练手册中关于消防设施操作的内容与船舶布置不相符,开具缺陷如下:07124 The information/instruction regarding the operation of firefighting equipment and appliances included in fire training manual are incomplete.展开更多
This paper theoretically studies the axisymmetric frictionless indentation of a transversely isotropic piezoelectric semiconductor(PSC)half-space subject to a rigid flatended cylindrical indenter.The contact area and ...This paper theoretically studies the axisymmetric frictionless indentation of a transversely isotropic piezoelectric semiconductor(PSC)half-space subject to a rigid flatended cylindrical indenter.The contact area and other surface of the PSC half-space are assumed to be electrically insulating.By the Hankel integral transformation,the problem is reduced to the Fredholm integral equation of the second kind.This equation is solved numerically to obtain the indentation behaviors of the PSC half-space,mainly including the indentation force-depth relation and the electric potential-depth relation.The results show that the effect of the semiconductor property on the indentation responses is limited within a certain range of variation of the steady carrier concentration.The dependence of indentation behavior on material properties is also analyzed by two different kinds of PSCs.Finite element simulations are conducted to verify the results calculated by the integral equation technique,and good agreement is demonstrated.展开更多
In comparison with inorganic solar cells, polymer solar cells （PSCs） possess the advantages of light weight and po- tential low-cost production technology such as roll-to-roll printing production. And the power conv...In comparison with inorganic solar cells, polymer solar cells （PSCs） possess the advantages of light weight and po- tential low-cost production technology such as roll-to-roll printing production. And the power conversion efficiency （PCE） of the PSCs reached ca. 10% recently. However, the high PCE is limited to the PSCs with the low bandgap pol- ymer PBDTTTs as donor and PCTOBM as acceptor, and the optimized active layer thickness of the high efficiency PSCs is usually less than 100 nm. The dominant acceptor of PCTOBM places serious limitation on the development of the polymer donor materials to match with PC70BM, and the thin active layer makes large area fabrication of the PSCs very difficult.展开更多
聚合物太阳能电池（PSCS）的转换效率虽然可能永远无法和主流市场上的硅晶、无机太阳能电池相提并论，但一份新发布的论文强调，这类有机电池可在远距离供电方面大放异彩。最近俄亥俄州立大学（Ohio State University）电机工程学家Paul...聚合物太阳能电池（PSCS）的转换效率虽然可能永远无法和主流市场上的硅晶、无机太阳能电池相提并论，但一份新发布的论文强调，这类有机电池可在远距离供电方面大放异彩。最近俄亥俄州立大学（Ohio State University）电机工程学家Paul Berger、展开更多
钙钛矿太阳能电池(perovskite solar cells,PSCs)由于光电转换效率高、制备工艺简单、成本低等优势受到广泛关注,电池效率已从3.8%提升到25.7%。目前,对基于SnO_(2)电子传输层的n-i-p型平板结构电池的研究越来越多,但存在着工艺可重复...钙钛矿太阳能电池(perovskite solar cells,PSCs)由于光电转换效率高、制备工艺简单、成本低等优势受到广泛关注,电池效率已从3.8%提升到25.7%。目前,对基于SnO_(2)电子传输层的n-i-p型平板结构电池的研究越来越多,但存在着工艺可重复性差、效率低等问题。针对n-i-p型平板结构PSCs的制备进行了系统的研究,包括导电基底的选择、钙钛矿制备工艺参数的优化以及电池存储环境。结果证明,上述参数对于电池均具有重要影响,并结合扫描电子显微镜、X射线衍射、吸收光谱分析了原因。在最优工艺条件下(掺锡氧化铟基底,PbI_(2)退火温度70℃(1 min),胺盐溶液滴加后静置时间不超过5 s,存储湿度4.5%),器件平均效率达到21.85%,最高效率达到23.47%,迟滞可忽略,具有良好的可重复性。研究结果可为制备重复性好、光电转换效率高的PSCs提供科学支撑。展开更多
基金supported by National Natural Science Foundation of China(Grant No.22001050,22072034)the China Postdoctoral Science Foundation(Grant No.2020T130147,2020M681084)+1 种基金the Postdoctoral Foundation of Heilongjiang Province(Grant No.LBH-Z19059)the Natural Science Foundation of Heilongjiang Youth Fund(Grant No.YQ2021B002)。
文摘Here,a novel strategy is proposed targeting the volatility of A-site cations and the disordered arrangement of perovskite grains through employing Cs~+contained metal-organic frameworks In-aip(Cs)obtained by ion-exchange and crystalline transform.Interatomic forces between Cs-O atoms split the pore channels of the pristine In-aip,endowing In-aip(Cs)with multidimensional charge transport channels,In addition,the partially freed Cs~+in the interlayer compensates for the vacancy of A-site cations during the perovskite preparation process.The In-aip(Cs)modified perovskite films have a flat morphology,large grains and excellent optoelectronic properties.Benefiting from the high-quality perovskite films and faster charge extraction,the In-aip(Cs)-modified PSCs achieved a champion PCE of 23.03%,superior to the In-aip-modified(22.29%)and control device(21.13%),More importantly,the unencapsulated PSCs modified with In-aip(Cs)exhibited outstanding humidity and thermal stability.Over a period of almost 1000 h,the unencapsulated In-aip(Cs)-modified device retained 85%of its initial PCE after storing in a glove box at 85℃,and retained 87%of the primary PCE upon storage in ambient condition at 25℃under a humidity of 40%.
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDA01020102)the grant from the Natural Science Foundation of China (No. 81225004)
文摘Introducing a combination of transcription factors such as Oct4,Sox2,Klf4 and c-Myc（OSKM）enables reprogramming which converts somatic cells into induced pluripotent stem cells（i PSCs）（Takahashi and Yamanaka,2006）.i PSCs play an important role in clinical and regenerative medicine because they can be utilized to model a specific disease or differentiate into functional cells for transplantation.Enhancing the efficiency of induction and improving the qualities of iPSCs are constant themes in this field.
文摘PSCO对某国际航行货轮开展PSC检查,检查中发现船舶训练手册中关于消防设施操作的内容与船舶布置不相符,开具缺陷如下:07124 The information/instruction regarding the operation of firefighting equipment and appliances included in fire training manual are incomplete.
基金Project supported by the National Natural Science Foundation of China(Nos.12072209,U21A2043012192211)+1 种基金the Natural Science Foundation of Hebei Province of China(No.A2020210009)the S&T Program of Hebei Province of China(No.225676162GH)。
文摘This paper theoretically studies the axisymmetric frictionless indentation of a transversely isotropic piezoelectric semiconductor(PSC)half-space subject to a rigid flatended cylindrical indenter.The contact area and other surface of the PSC half-space are assumed to be electrically insulating.By the Hankel integral transformation,the problem is reduced to the Fredholm integral equation of the second kind.This equation is solved numerically to obtain the indentation behaviors of the PSC half-space,mainly including the indentation force-depth relation and the electric potential-depth relation.The results show that the effect of the semiconductor property on the indentation responses is limited within a certain range of variation of the steady carrier concentration.The dependence of indentation behavior on material properties is also analyzed by two different kinds of PSCs.Finite element simulations are conducted to verify the results calculated by the integral equation technique,and good agreement is demonstrated.
文摘In comparison with inorganic solar cells, polymer solar cells （PSCs） possess the advantages of light weight and po- tential low-cost production technology such as roll-to-roll printing production. And the power conversion efficiency （PCE） of the PSCs reached ca. 10% recently. However, the high PCE is limited to the PSCs with the low bandgap pol- ymer PBDTTTs as donor and PCTOBM as acceptor, and the optimized active layer thickness of the high efficiency PSCs is usually less than 100 nm. The dominant acceptor of PCTOBM places serious limitation on the development of the polymer donor materials to match with PC70BM, and the thin active layer makes large area fabrication of the PSCs very difficult.
文摘钙钛矿太阳能电池(perovskite solar cells,PSCs)由于光电转换效率高、制备工艺简单、成本低等优势受到广泛关注,电池效率已从3.8%提升到25.7%。目前,对基于SnO_(2)电子传输层的n-i-p型平板结构电池的研究越来越多,但存在着工艺可重复性差、效率低等问题。针对n-i-p型平板结构PSCs的制备进行了系统的研究,包括导电基底的选择、钙钛矿制备工艺参数的优化以及电池存储环境。结果证明,上述参数对于电池均具有重要影响,并结合扫描电子显微镜、X射线衍射、吸收光谱分析了原因。在最优工艺条件下(掺锡氧化铟基底,PbI_(2)退火温度70℃(1 min),胺盐溶液滴加后静置时间不超过5 s,存储湿度4.5%),器件平均效率达到21.85%,最高效率达到23.47%,迟滞可忽略,具有良好的可重复性。研究结果可为制备重复性好、光电转换效率高的PSCs提供科学支撑。
