该研究制备高电导、高透明的磷掺杂氢化纳米晶硅氧(nc-Si Ox:H)薄膜,应用于晶硅异质结(SHJ)太阳电池的窗口层以替代传统的氢化非晶硅(a-Si:H)薄膜。与以a-Si:H薄膜为窗口层的电池相比,短路电流密度提高0.5 m A/cm^(2),达到38.5 m A/cm^(...该研究制备高电导、高透明的磷掺杂氢化纳米晶硅氧(nc-Si Ox:H)薄膜,应用于晶硅异质结(SHJ)太阳电池的窗口层以替代传统的氢化非晶硅(a-Si:H)薄膜。与以a-Si:H薄膜为窗口层的电池相比,短路电流密度提高0.5 m A/cm^(2),达到38.5 m A/cm^(2),填充因子为82.7%,光电转换效率为23.5%。实验发现,在nc-Si Ox:H薄膜沉积前对本征非晶硅层表面进行处理,沉积1 nm纳米晶硅(nc-Si:H)种子层,可改善nc-Si Ox:H薄膜的晶化率,降低薄膜中的非晶相含量。与单层nc-Si Ox:H窗口层的电池相比,nc-Si:H/nc-Si Ox:H叠层结构提高电池填充因子,达到83.4%,光电转换效率增加了0.3%,达到23.8%。展开更多
首先以二甲基咪唑锌盐ZIF-8为模板,在ZIF-8颗粒中进行原位铁离子的掺杂。在制备过程中加入氧化石墨烯(GO)进行复合,将得到的固体经高温碳化后制备出Fe@NC/还原氧化石墨烯复合纳米材料。采用扫描电子显微镜(SEM)、投射电子显微镜(TEM)以...首先以二甲基咪唑锌盐ZIF-8为模板,在ZIF-8颗粒中进行原位铁离子的掺杂。在制备过程中加入氧化石墨烯(GO)进行复合,将得到的固体经高温碳化后制备出Fe@NC/还原氧化石墨烯复合纳米材料。采用扫描电子显微镜(SEM)、投射电子显微镜(TEM)以及X射线衍射(XRD)表征材料的形貌和结构。将Fe@NC/r GO复合纳米材料制成墨液,分散在工作电极有效区后晾干用于测量材料的甲醇氧化活性,结果显示:用Fe@NC/r GO复合纳米材料制备而成的活性电极在0.5 M KOH+1 M CH3OH和进行循环伏安测试,在30 m Vs^(-1)扫速下,电压为0.88 V时,电流密度高达112.3 m A cm^(-2)。在对材料的循环稳定性进行测试时,在30 m V s^(-1)扫速下进行高达500圈的循环之后,峰电流密度也能保持原电流密度的73.45%,表明Fe@NC/rGO复合纳米材料具有优异的稳定性。展开更多
We study the influence of the thermodynamic coefficients on transient negative capacitance for the Zr-doped HfO_(2)(HZO)ferroelectric capacitors by the theoretical simulation based on the Landau-Khalatnikov(L-K)theory...We study the influence of the thermodynamic coefficients on transient negative capacitance for the Zr-doped HfO_(2)(HZO)ferroelectric capacitors by the theoretical simulation based on the Landau-Khalatnikov(L-K)theory and experimental measurement of electrical properties in the resistor-ferroelectric capacitor(R-FEC)circuit.Our results show that the thermodynamic coefficientsα,βandγalso play a key role for the transient NC effect besides the viscosity coefficient and series resistor.Moreover,the smaller coefficientsαandβ,the more significant the transient NC effect.In addition,we also find that the thermodynamic process of transient NC does not obey the generally accepted viewpoint of Gibbs free energy minimization.展开更多
It is of vital importance to design efficient and low-cost bifunctional catalysts for the electrochemical water splitting under alkaline and neutral pH conditions.In this work,we report an efficient and stable NiCo_(2...It is of vital importance to design efficient and low-cost bifunctional catalysts for the electrochemical water splitting under alkaline and neutral pH conditions.In this work,we report an efficient and stable NiCo_(2)S_(4)/N,S co-doped reduced graphene oxide(NCS/NS-rGO)electrocatalyst for water splitting,in which NCS microspheres are composed of one-dimentional(1D)nanorods grown homogeneously on the surface of NS-rGOs).The synergetic effect,abundant active sites,and hybridization of NCS/NS-rGO endow their outstanding electrocatalytic performance for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in both alkaline and neutral conditions.Furthermore,NCS/NS-rGO employed as both anode and cathode in a two-electrode alkaline and neutral system electrolyzers deliver 10 mA/cm^(2) with the low cell voltage of 1.58 V in alkaline and 1.91 V in neutral condition.These results illustrate the rational design of carbon-supported nickel-cobalt based bifunctional materials for practical water splitting over a wide pH range.展开更多
系统研究两种不同形态的硅氧合金薄膜,用甚高频PECVD系统制备的非晶硅氧和纳米硅氧薄膜的特性,以及其在纳米硅薄膜叠层薄膜太阳电池中的应用。实验中主要通过对不同的气体流量比的优化、沉积功率和沉积压力的优化,分别制备出光学带隙约...系统研究两种不同形态的硅氧合金薄膜,用甚高频PECVD系统制备的非晶硅氧和纳米硅氧薄膜的特性,以及其在纳米硅薄膜叠层薄膜太阳电池中的应用。实验中主要通过对不同的气体流量比的优化、沉积功率和沉积压力的优化,分别制备出光学带隙约为2.1 e V,折射率约为3的a-SiO_x∶B∶H薄膜,作为非晶硅顶电池的p1层,以及带隙为2.2~2.5 e V,折射率为2.0~2.5,晶化率为20%~50%的nc-SiO_x∶P∶H薄膜,作为非晶硅/纳米硅叠层电池的中间反射层和纳米硅的底电池n2层。最后将优化后的a-SiO_x∶B∶H和nc-SiO_x∶P∶H薄膜应用到非晶硅/纳米硅薄膜叠层电池中,在0.79 m^2的玻璃基板上制备出初始峰值功率为101.1 W、全面积初始转换效率为12.8%、稳定峰值功率为87.3 W、全面积稳定转换效率为11.1%的非晶硅/纳米硅叠层电池。展开更多
文摘首先以二甲基咪唑锌盐ZIF-8为模板,在ZIF-8颗粒中进行原位铁离子的掺杂。在制备过程中加入氧化石墨烯(GO)进行复合,将得到的固体经高温碳化后制备出Fe@NC/还原氧化石墨烯复合纳米材料。采用扫描电子显微镜(SEM)、投射电子显微镜(TEM)以及X射线衍射(XRD)表征材料的形貌和结构。将Fe@NC/r GO复合纳米材料制成墨液,分散在工作电极有效区后晾干用于测量材料的甲醇氧化活性,结果显示:用Fe@NC/r GO复合纳米材料制备而成的活性电极在0.5 M KOH+1 M CH3OH和进行循环伏安测试,在30 m Vs^(-1)扫速下,电压为0.88 V时,电流密度高达112.3 m A cm^(-2)。在对材料的循环稳定性进行测试时,在30 m V s^(-1)扫速下进行高达500圈的循环之后,峰电流密度也能保持原电流密度的73.45%,表明Fe@NC/rGO复合纳米材料具有优异的稳定性。
基金Project supported by the National Key Project of Science and Technology of China(Grant No.2017ZX02315001-002)。
文摘We study the influence of the thermodynamic coefficients on transient negative capacitance for the Zr-doped HfO_(2)(HZO)ferroelectric capacitors by the theoretical simulation based on the Landau-Khalatnikov(L-K)theory and experimental measurement of electrical properties in the resistor-ferroelectric capacitor(R-FEC)circuit.Our results show that the thermodynamic coefficientsα,βandγalso play a key role for the transient NC effect besides the viscosity coefficient and series resistor.Moreover,the smaller coefficientsαandβ,the more significant the transient NC effect.In addition,we also find that the thermodynamic process of transient NC does not obey the generally accepted viewpoint of Gibbs free energy minimization.
基金supported by the National Natural Science Foundation of China(Nos.51962032,61704114,and 51764049)the Youth Innovative Talents Cultivation Fund,Shihezi University(No.KX01480109)the Opening Project of The Research Center for Material Chemical Engineering Technology of Xinjiang Bingtuan(No.2017BTRC007).
文摘It is of vital importance to design efficient and low-cost bifunctional catalysts for the electrochemical water splitting under alkaline and neutral pH conditions.In this work,we report an efficient and stable NiCo_(2)S_(4)/N,S co-doped reduced graphene oxide(NCS/NS-rGO)electrocatalyst for water splitting,in which NCS microspheres are composed of one-dimentional(1D)nanorods grown homogeneously on the surface of NS-rGOs).The synergetic effect,abundant active sites,and hybridization of NCS/NS-rGO endow their outstanding electrocatalytic performance for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in both alkaline and neutral conditions.Furthermore,NCS/NS-rGO employed as both anode and cathode in a two-electrode alkaline and neutral system electrolyzers deliver 10 mA/cm^(2) with the low cell voltage of 1.58 V in alkaline and 1.91 V in neutral condition.These results illustrate the rational design of carbon-supported nickel-cobalt based bifunctional materials for practical water splitting over a wide pH range.
文摘系统研究两种不同形态的硅氧合金薄膜,用甚高频PECVD系统制备的非晶硅氧和纳米硅氧薄膜的特性,以及其在纳米硅薄膜叠层薄膜太阳电池中的应用。实验中主要通过对不同的气体流量比的优化、沉积功率和沉积压力的优化,分别制备出光学带隙约为2.1 e V,折射率约为3的a-SiO_x∶B∶H薄膜,作为非晶硅顶电池的p1层,以及带隙为2.2~2.5 e V,折射率为2.0~2.5,晶化率为20%~50%的nc-SiO_x∶P∶H薄膜,作为非晶硅/纳米硅叠层电池的中间反射层和纳米硅的底电池n2层。最后将优化后的a-SiO_x∶B∶H和nc-SiO_x∶P∶H薄膜应用到非晶硅/纳米硅薄膜叠层电池中,在0.79 m^2的玻璃基板上制备出初始峰值功率为101.1 W、全面积初始转换效率为12.8%、稳定峰值功率为87.3 W、全面积稳定转换效率为11.1%的非晶硅/纳米硅叠层电池。
