PLD法合成MgxZn1-xO纳米柱阵列

使用脉冲激光沉积法(PLD)在Si(100)衬底上无催化生长出了MgxZn1-xO纳米柱阵列.扫描电镜结果发现:在较大的范围内,直径为30～50nm、长度约为60nm均匀分布的纳米柱阵列生长在一层厚度约为70nm的纳米晶薄膜上.XRD结果中的(002)峰和PL谱中的带边发射峰相对于纯ZnO薄膜都发生了不同程度的偏移,表明了Mg组分的掺入改变了ZnO的晶格常数和带隙宽度.分析了MgxZn1-xO纳米柱的生长机制.     

半导体量子点敏化太阳电池的最新进展

半导体量子点太阳电池目前是一个十分热门的研究领域,在未来新能源利用领域具有潜在的应用价值。首先,介绍了几种量子点敏化电极的制备技术。然后,着重评述了CdS,CdSe和PdS量子点敏化太阳电池近年的研究进展。通过对大量最新的相关文献进行总结发现,电池的性能主要受量子点的组装技术、能带结构以及基体材料等因素的影响。最后,分析了该领域中目前存在的问题,并提出了今后研究的对策,包括采用两种量子点共敏化方法以提高光俘获效率,采用沉积钝化层的方法以降低载流子复合。     

Synthesis and photocatalytic performance of Ag3PO4/AgCl hybrids

Ag3POa/AgC1 hybrids have been synthesized via a facile ion-exchange method. The hybrids exhibit an enhanced photocatalytie activity for degradation of rhodamine B （RhB） than the single Ag-3PO_4 or AgCl under a visible light irradiation. Such a behavior might be attributed to the increased number of high active sites and suitable energy band structure. The possible mechanism is also discussed.     

pH对电沉积氧化亚铜薄膜的影响及光催化性能

以导电玻璃为阴极,在不同pH下,从含有0.083mol/LCu(CH3COO)2·H2O、0.22mol/L乳酸的电解液中电沉积合成Cu2O薄膜。研究了电解液pH对Cu2O薄膜晶体择优取向和形貌的影响。结果表明,通过调节电解液pH可合成不同择优取向和形貌的Cu2O薄膜,在pH为7～13内合成的Cu2O薄膜均具有较好的光吸收性。pH=11时,可制得具有(111)取向、结合力强、光催化活性高和稳定性好的Cu2O薄膜。Cu2O薄膜的晶面类型对薄膜催化能力有较大影响,(111)择优取向的Cu2O薄膜的光催化活性最高,反应2.5h后罗丹明B的降解率可达63%。     

脉冲激光沉积法Li-N双受主共掺p型ZnO薄膜的生长及其特性

采用脉冲激光沉积技术制备了Li-N双受主共掺杂p型ZnO薄膜,其中Li来自Li掺杂ZnO陶瓷靶,N来自N2O生长气氛.室温Hall测试发现Li-N共掺p型ZnO薄膜的最低电阻率为3.99Ω·cm,迁移率为0.17cm2/(V·s),空穴浓度为9.12×1018cm-3.PL谱测试发现了与Li受主和N受主态相关的发光峰,其受主能级分别约为120和222meV.由p-ZnO:(Li,N)薄膜制备的ZnO同质p-n结具有整流特性.     

PLD法制备锑掺杂p型ZnO薄膜

采用脉冲激光沉积方法在石英衬底上生长了掺锑(Sb)的p型ZnO薄膜.X射线衍射测试表明薄膜具有c轴择优取向的结构特性,霍尔测试表明ZnO薄膜呈p型导电特性,XPS分析表明Sb掺入了ZnO薄膜,且Sb掺人ZnO中是占据Zn的位置,而不是O的晶格位置.通过优化温度获得了电学性能优良的p型ZnO薄膜,其电阻率为2.21Ω·cm,迁移率为1.23cm2/(V·s),空穴浓度为2.30×1018cm-3.     

Improved performance of perovskite solar cells through using (FA)x(MA)1-xPbI3 optical absorber layer

In this work, the perovskite solar cells (PSCs) were fabricated with the bandgap-tunable (FA)x(MA)1-xPbI3 absorber layers through a facile two-stage deposition route. The doping was realized by adding the formamidinium iodide (FAI) into a precursor MAI solution. Both the surface morphology and electrochemical impedance spectra (EIS) were conducted to evaluate the absorber layers or solar cells. After the optimization, the best PSC performance of 14.73% was achieved at a nominal FAI content of 12.5 at.%. The performance enhancement was attributed to both the enhancement of visible light harvesting and carrier transport capability. Besides, the stability of a PSC device based on the single MAPbI3 absorber layer was also investigated, and a power conversion efficiency (PCE) of 11.27 % remained even after laying in vacuum for 10 days.     

应用于染料敏化太阳电池的ZnO与TiO_2纳米线(管)阵列的比较研究（英文）

首先通过水热法在透明导电基底上合成出垂直有序的ZnO纳米线阵列,再对这些ZnO纳米线进行表面处理以得到TiO2纳米管阵列。随后,这些纳米线(管)阵列被用作光阳极组装染料敏化太阳电池(DSSC),以探索它们的光电化学性能。通过研究发现,用TiO2纳米管阵列组装而成的DSSC具有0.81%的太阳能转换效率,高出ZnO纳米线阵列组装而成的DSSC 3倍以上。另外,还运用一个简单的二极管模型对这些DSSC的伏安特性(J-V)曲线进行分析。最终发现,造成DSSC性能大幅度提高的原因在于其内部并联电阻的增加以及泄漏电流的下降。     

纳米氧化亚铜制备方法的研究进展

氧化亚铜是一种新型无机材料，具有优异的光电性能，在可见光催化降解等领域有广泛的应用。结合最新研究进展论述了采用不同方法合成各种形貌的纳米Cuz0及其合成机理，并讨论了目前合成方法存在的问题和以后的发展方向。     

Effect of growth time on morphology and photoelectrochemical performance of TiO2 nanorod arrays grown on transparent conducting substrates

TiO2 nanorod arrays (NRAs) were synthesized directly on the fluorine tin oxide (FTO) coated glass substrates by a facile hydrothermal route. The effects of growth time on the photoelectrochemical (PEC) properties of TiO2 NRAs are investigated. The samples synthesized for 4 h exhibit a photocurrent intensity of 0.37 mA/cm2 at the irradiation of Xe lamp and a bias of 0 V. As the growth time increases, the thickness and order degree of the NRAs are enhanced, but the photocurrent is reduced a lot. It might be associated with the hindering of a high background electron density in NRs due to the long-time hydrothermal reaction in acid environment. Moreover, the decline behavior is observed, which is attributed to the poor charge separation capacity of TiO2 array electrodes and could be suppressed efficiently by applying a suitable positive bias.