多晶Hg_(1-x)Cd_xTe薄膜电极 多硫氧化还原电对溶液的界面现象研究

测量了系列(1-x)值的电沉积多晶Hg_(1-x)Cd_xTe薄膜电极在多硫氧化还原电对溶液中的交流阻抗和光电流光谱,据此确定出不同(1-x)值时的平带电位Φ(?)和禁带宽度E(?).当(1-x)值增大时,平带电位正移,禁带宽度E(?)变小,导带位置下降(负移),价带位置基本保持不变.系列Hg_(1-x)Cd_xTe薄膜电极在多硫溶液中的开路光电压比由平带电位Φ_(fb)推算出的极限开路光电压低,因此存在着提高实际开路光电压的潜力.     

多晶富镉Hg_(1-x)Cd_xTe的电沉积及Hg_(0.09)Cd_(0.91)Te薄膜的光电化学行为

本文研究了在酸性CdSO_4+HTeO_2~+6HgCl_2 电解液中多晶富镉Hg_(1-x),Cd_(?),Te(x>0.5)的电沉积过程,实现了三种离子在同一电位下共沉积的技术。对在钛基底上沉积出的薄膜进行XRD,SEM和EDAX分析,结果表明薄膜为闪锌矿型的多晶结构,分布均匀连续。考察了(1—x)=0.09时多晶薄膜在多硫氧化还原电对液中的光电化学行为,光强为100mW/cm~2时,短路光电流I_(sc)=1.88mA/cm~2,开路光电压V_(oc)=0.25V,填充因子F·F=0.22。由光电化学光谱所确定出的禁带宽度E_g=1.26eV,Mott-schottky曲线给出了电极的平带电位φfb为—1.26V(vs.SCE),从而得到开路光电压V_(oc)可能达到的最大值为0.49V。因此,多晶富镉Hg_(1-x)Cd_xTe薄膜是一种很有潜力的光活性电极材料。     

ELECTRODEPOSITION OF POLYCRYSTALLINE Cd-RICH Hg_(1-x)Cd_xTe AND PHOTOELECTROCHEMICAL BEHAVIOR OF Hg_(0.09)Cd_(0.91)Te THIN FILM

Electrodeposition process of polycrystalline Cd-rich Hg_(1-z)Cd_xTe (x>0.5) in acidic bath of CdSO_4+HTeO_2~+HgCl_2 was investigated. The simultaneous electrodeposition technique of three kinds of ions at the same potential has been achieved. The XRD, SEM and EDAX analysis of the thin film electrodeposited on titanium substrate showed a typical cubic zinc blende polycrystalline structure and homogeneous dispersion. The photoelectrochemical behavior of (1-x)=0.09 polycrystalline thin film in a polysulfide redox couple solution was examined. Under illumination of 100 mW/cm~2, the short circuit photocurrent I_(sc)=1.88 mA/cm~2, the open circuit photovoltage V_(oc)=0.25 V, the fill factor F·F=0.22. The bandgap E_g measured with photoelectrochemical spectroscopy is 1.26 eV. Flatband potential φ_(tb), Obtained from Mott-Schottky curve is -1.26 Ⅴ (vs. SCE). Therefore, the obtainable maximum open circuit photovoltage could be 0.49 Ⅴ. The Cd-rich Hg_(1-x)Cd_x Te thin film should be a potential photoactive el     

有机硼小分子受体材料

<正>有机太阳能电池具有柔性、重量轻、溶液加工、成本低的突出优势,适合未来在便携式能源中应用,是当前的国际科学研究热点~(1–4)。有机太阳能电池以有机/高分子给体材料和受体材料的共混物作为光电活性层。受益于稠环芳烃类小分子受体材料的开发,近几年来有机太阳能电池领域迅速发展,其单结器件的效率已经超过了14%,展现了巨大的应用潜力~3。     

铜锌锡硫硒太阳能电池Mo/CZTSSe界面调控研究进展

Cu2ZnSn(Sx,Se1-x)4太阳能电池制备过程中Mo基底硒(硫)化反应产生较厚的Mo(Sx,Se1-x)2,以及SnS(e)与ZnS(e)的生成与挥发在Mo/CZTSSe界面处产生的孔洞,是限制器件性能提升的重要原因.针对这些问题,总结了Mo(Sx,Se1-x)2和孔洞的生成原因及其对器件性能的影响.此外,还综...     

基于1D/0D有序复合SnO2纳米晶的钙钛矿太阳能电池

通过水热前驱体中的功能添加剂调控一维(1D)纳米棒阵列疏密度,继而在纳米棒间隙沉积零维(0D)纳米颗粒,制备1D/0D有序的复合SnO2电子传输层(ETL),并组装高效、稳定的钙钛矿太阳能电池。系统研究前驱体中NaCl添加剂以及后续纳米颗粒的沉积对复合ETL的形貌结构、光谱性能及界面电荷过程的作用规律,探讨上述作用对电池光电性能的影响机制。前驱体中NaCl的加入使棒密度变小,从而使0D纳米颗粒顺利渗透到1D纳米棒间隙中,其对钙钛矿/ETL和钙钛矿/FTO界面复合的抑制作用是造成器件开路电压和填充因子增大的原因。在经2 mL饱和NaCl水溶液改性的1D电子传输层ETL-2Cl的基础上,继续沉积0D的纳米颗粒,制备得到新型1D/0D复合电子传输层ETL-2P,后者优良的电荷复合抑制作用(复合电阻是ETL-2Cl的2.9倍)和高效的电子抽提性能(抽提速率3.03×10^7 s^-1,抽提效率91.6%)促成了电池较优的光电性能(光电效率12.15%)。     

构筑先进二维异质结构Ag/WO_(3-x)用于提升光电转化效率（英文）

等离子体激元诱导的光电化学反应被认为是太阳能转换的有效的替代方案。寻找具有增强的光吸收以及更长载流子寿命的高效光催化剂对于提高太阳能的转换效率至关重要,但其制备却具有挑战性。我们制备了Ag纳米颗粒均匀负载的二维(2D)无定形三氧化钨(a-WO_(3-x)),并对其进行退火处理,所获得的纳米异质结用作光电极材料具有高效的光电转化效率,并且其光氧化降解性能也显著提升。该光电阳极的高光电催化(PEC)性能归因于等离子体金属Ag纳米颗粒的局部表面等离子共振(LSPR)效应能够增强体系的光吸收和热电子转移。此外,局部结晶-非晶界面的构筑可以进一步提高光生电子-空穴对的分离效率并增加体系的导电性。     

少铅钙钛矿CH3NH3SrxPb(1-x)I3的合成及其在全固态薄膜太阳能电池中的应用

近年来, 有机-无机杂化铅卤化物钙钛矿太阳能电池(PSCs)得到了迅猛发展, 其最高光电转换效率已经达到19.3%. 该类型太阳能电池使用的钙钛矿型吸光材料为含Pb的有机-无机杂化铅卤钙钛矿, 从长远来看,Pb的毒性将制约其大规模应用. 本文从减少吸光材料中Pb的含量出发, 尝试用Sr 部分取代Pb制备一系列少铅钙钛矿CH₃NH₃Sr_xPb_(1-x)I₃, 并将其应用于钙钛矿太阳能电池进行光电性能的研究. 研究结果表明, 相比于全Pb 钙钛矿(CH₃NH₃PbI₃)材料, Sr 取代量为30% (x=0.3)时, 所形成的CH₃NH₃Sr_0.3Pb_0.7I₃光谱吸收大范围增强,但基于此材料制备的电池器件性能明显下降.     

多晶Hg~1-xCd~xTe薄膜电极/多梳氧化还原电对溶液的界面现象研究

测量了系列(1-x)值的电沉积多晶Hg~1-xCd~xTe薄膜电极在多硫氧化还原电对溶液中的交流阻抗和光电流光谱, 据此确定出不同(1-x)值时的平带宽度。当(1-x)值增大时, 平带电位正移, 禁带宽度变小, 导带位置下降(负移), 价带位置基本保持不变。系列Hg~1-xCd~xTe薄膜电极在多硫溶液中的开路光电压比由平带电位推算出的极限开路光电压低, 因此存在着提高实际开路光电压的潜力。     

多晶Hg~1-xCd~xTe薄膜电极/多梳氧化还原电对溶液的界面现象研究

测量了系列(1-x)值的电沉积多晶Hg~1-xCd~xTe薄膜电极在多硫氧化还原电对溶液中的交流阻抗和光电流光谱, 据此确定出不同(1-x)值时的平带宽度。当(1-x)值增大时, 平带电位正移, 禁带宽度变小, 导带位置下降(负移), 价带位置基本保持不变。系列Hg~1-xCd~xTe薄膜电极在多硫溶液中的开路光电压比由平带电位推算出的极限开路光电压低, 因此存在着提高实际开路光电压的潜力。     

OH(3) (-) and O(2)H(5) (-) double Rydberg anions: predictions and comparisons with NH(4) (-) and N(2)H(7) (-)

A low barrier in the reaction pathway between the double Rydberg isomer of OH(3) (-) and a hydride-water complex indicates that the former species is more difficult to isolate and characterize through anion photoelectron spectroscopy than the well known double Rydberg anion (DRA), tetrahedral NH(4) (-). Electron propagator calculations of vertical electron detachment energies (VEDEs) and isosurface plots of the electron localization function disclose that the transition state's electronic structure more closely resembles that of the DRA than that of the hydride-water complex. Possible stabilization of the OH(3) (-) DRA through hydrogen bonding or ion-dipole interactions is examined through calculations on O(2)H(5) (-) species. Three O(2)H(5) (-) minima with H(-)(H(2)O)(2), hydrogen-bridged, and DRA-molecule structures resemble previously discovered N(2)H(7) (-) species and have well separated VEDEs that may be observable in anion photoelectron spectra.     

Mixed ligand titanium(IV) complexes. Chlorobis(dithiocarbamato)bis(methylsalicylato)titanium(IV) andbis(dithiocarbamato)bis(methylsalicylato)titanium(IV)

Summary Dichlorobis(methylsalicylato)titanium(IV) reacts with potassium or amine salts of dialkyl or diaryl dithiocarbamates in 11 and 12 molar ratios in anhydrous benzene (room temperature) or in boiling CH₂Cl₂ to yield mixed ligand complexes: (AcOC₆H₄O)₂ Ti(S₂CNR₂)Cl (1) and (AcOC₆H₄O)₂ Ti(S₂CNR₂)₂ (2), R=Et, n-Pr, n-Bu, cyclo-C₄H₈ and cyclo-C₅H₁₀. These compounds are moisture sensitive and highly soluble in polar solvents. Molecular weight measurement in conjunction with i.r.,¹H and¹³C n.m.r. spectral studies suggest coordination number 7 and 8 around titanium(IV) in (1) and (2) respectively.     

Bis(trifluoroacetyl) peroxide, CF(3)C(O)OOC(O)CF(3)

Pure, highly explosive CF(3)C(O)OOC(O)CF(3) is prepared for the first time by low-temperature reaction between CF(3)C(O)Cl and Na(2)O(2). At room temperature CF(3)C(O)OOC(O)CF(3) is stable for days in the liquid or gaseous state. The melting point is -37.5 degrees C, and the boiling point is extrapolated to 44 degrees C from the vapor pressure curve log p = -1875/T + 8.92 (p/mbar, T/K). Above room temperature the first-order unimolecular decay into C(2)F(6) + CO(2) occurs with an activation energy of 129 kJ mol(-1). CF(3)C(O)OOC(O)CF(3) is a clean source for CF(3) radicals as demonstrated by matrix-isolation experiments. The pure compound is characterized by NMR, vibrational, and UV spectroscopy. The geometric structure is determined by gas electron diffraction and quantum chemical calculations (HF, B3PW91, B3LYP, and MP2 with 6-31G basis sets). The molecule possesses syn-syn conformation (both C=O bonds synperiplanar to the O-O bond) with O-O = 1.426(10) A and dihedral angle phi(C-O-O-C) = 86.5(32) degrees. The density functional calculations reproduce the experimental structure very well.