共查询到18条相似文献,搜索用时 62 毫秒
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采用热饱和溶液法,通过调控前驱体溶液1,4-丁内酯中PbI2和CH3NH3I的配比,进而对前驱液100℃进行加热,简单易操作地得到单晶CH3NH3PbI3。计算了不同调控条件下单晶CH3NH3PbI3的产率;利用SEM和XRD对其形貌和结晶度进行表征;通过吸收和荧光光谱对单晶的光谱性能进行表征。结果表明,单晶CH3NH3PbI3的最佳摩尔配比为n(PbI2)∶n(CH3NH3I)=2.3∶1,PbI2最佳浓度为1.229 mmol/mL。 相似文献
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有机-无机钙钛矿材料因为具有光谱吸收范围宽、缺陷密度低、载流子复合率低等非常优良的光电性能吸引了广泛关注, 掀起了钙钛矿材料研究热潮。近年来杂化钙钛矿型太阳能电池发展迅速, 光电转化效率目前已达到22.1%, 展现出极大的应用潜力。与多晶薄膜相比, 单晶具有极低的缺陷密度和极少的界面缺陷。多个课题组成功培养出大尺寸钙钛矿单晶, 发现钙钛矿单晶材料具有比其他薄膜多晶材料更好的光响应特性, 是设计制备光伏器件的理想材料。在各类钙钛矿材料中, CH3NH3PbI3是研究和应用最广泛的一类钙钛矿材料。本文主要针对近年来CH3NH3PbI3单晶材料的研究制备进行综述, 介绍了CH3NH3PbI3单晶材料的结构及性能, 重点总结了CH3NH3PbI3单晶材料生长制备方法和应用, 并对其发展趋势进行了展望。 相似文献
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采用全真空单源热蒸发沉积技术直接制备钙钛矿太阳电池用有机无机杂化CH3NH3PbI3薄膜。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能量色散谱仪(EDS)和分光光度计对制备的CH3NH3PbI3薄膜微结构、表面形貌、化学成分和光学性能进行表征分析, 并与非真空旋涂法制备的CH3NH3PbI3薄膜性能进行比较。结果表明: 单源热蒸发法制备的CH3NH3PbI3薄膜呈现单一的钙钛矿四方晶体结构, 且与蒸发源材料的晶体结构同源性高, 没有出现杂质相偏析; 对比旋涂法制备的CH3NH3PbI3薄膜表面均匀致密平整, 且薄膜结晶度更高; 单源热蒸发法制备的CH3NH3PbI3薄膜禁带宽度为1.57 eV, 符合钙钛矿太阳电池吸收层光学性能要求。 相似文献
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铋系半导体BiOX(X=Cl、Br、I)因其独特的层状结构和合适的禁带宽度而表现出优异的光催化活性与稳定性, 已成为光催化材料领域极具应用前景的材料体系。本文首先针对BiOX(X=Cl、Br、I)光催化材料研究中的关键科学问题进行了深入分析, 进一步综述了国内外解决上述关键问题所采取的有效措施, 包括: 微结构调控、半导体复合、贵金属沉积、离子掺杂和表面敏化等, 并针对纳米结构BiOX(X=Cl、Br、I)负载于合适载体上实现固载的研究进展进行了概述, 从而对基于BiOX(X=Cl、Br、I)新型高性能光催化材料的最新研究进展进行了全面深入的综述, 最后展望了BiOX光催化材料的研究方向与趋势。 相似文献
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分别采用蒸发结晶法和逆温结晶法生长尺寸约为4 mm×3 mm×3 mm的CH3NH3PbCl3单晶。对两种方法生长的单晶粉体的XRD分析结果显示, 单晶具有立方晶系结构, 其晶格常数分别为0.56833、0.56891 nm。实验测量了CH3NH3PbCl3单晶的红外光谱(FT-IR)和拉曼光谱, 并对谱峰进行了指认; 使用UV-VIS-NIR分光光度计、荧光光度计对CH3NH3PbCl3单晶的光学性能进行了测试。结果表明: CH3NH3PbCl3晶体的吸收边约为423 nm, 光致发光峰为433 nm, 带隙值为2.97 eV, 与CH3NH3PbCl3薄膜的光学特性相比, CH3NH3PbCl3单晶更具潜在的应用前景。最后, 结合第一性原理研究了CH3NH3PbCl3晶体的能带结构, 计算得出带隙值2.428 eV, 与实验值吻合较好。 相似文献
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在室温条件下,以3-氨丙基三乙氧基硅烷为前驱体,使有机官能团-CH2CH2CH2NH2修饰了硅铝介孔分子筛MCM-41(Si/Al=35),制备了无机-有机复合材料MCM-(CH2)3NH2.并通过XRD,DTA-TGA,FTIR,N2吸附-脱附对复合材料MCM-(CH2)3NH2进行了表征. 相似文献
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采用冷却热饱和溶液法,以正丁基碘化胺(BAI)为有机元,碘化铅(PbI2)为无机元来合成二维钙钛矿材料。通过调整BAI与PbI2的配比及反应温度来研究不同因素对所合成钙钛矿产率和结晶质量的影响。利用SEM、XRD、紫外可见吸收及荧光光谱对合成的二维钙钛矿材料进行表征。确定了冷却热饱和溶液法制备二维BA2PbI4的最佳反应条件为,氢碘酸为溶剂,m(BAI)∶m(PbI2)=2.5∶1,水浴加热温度为85℃,水浴时间为120 min。 相似文献
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用GRIM(Grignard Metathesis Method)合成了聚(3-溴己基噻吩),并在硫代乙酸钾和氢化铝锂的作用下合成了巯基化的P3HT衍生物聚(3-(6-巯基己基)噻吩)。通过红外光谱、核磁共振波谱、凝胶渗透色谱、紫外-可见光谱、荧光光谱以及电化学分析对中间产物和最终产物的结构和光电性能进行了表征。结果表明,所合成聚合物与目标产物的结构一致,聚合物的数均相对分子质量为5621,多分散系数为1.39,在氯仿溶液中最大吸收波长为408 nm,最大发射波长为545 nm,电化学能隙为1.81 eV。 相似文献
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Thin films of microcrystalline CH3NH3PbX3 (X = halogen) as well as their mixed-halide crystals were fabricated by the spin-coating technique, and their optical properties were investigated. X-ray diffraction investigation revealed that CH3NH3PbBr3 – x
Cl
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(x = 0–3) were successfully formed on glass substrate self-assembly and oriented with the a-axis. Owing to due to their large exciton binding energy, these materials showed clear exciton absorption and free-exciton emission in the visible region at room temperature. Replacing Br with CI made it possible to control the band structure of these materials. As a result, the peak position of the exciton band shifted continuously towards blue region with increasing the CI content in the films. 相似文献
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Tzu‐Chiao Wei Hsin‐Ping Wang Ting‐You Li Chun‐Ho Lin Ying‐Hui Hsieh Ying‐Hao Chu Jr‐Hau He 《Advanced materials (Deerfield Beach, Fla.)》2017,29(35)
Organic–inorganic hybrid perovskite materials exhibit a variety of physical properties. Pronounced coupling between phonon, organic cations, and the inorganic framework suggest that these materials exhibit strong light–matter interactions. The photoinduced strain of CH3NH3PbBr3 is investigated using high‐resolution and contactless in situ Raman spectroscopy. Under illumination, the material exhibits large blue shifts in its Raman spectra that indicate significant structural deformations (i.e., photostriction). From these shifts, the photostrictive coefficient of CH3NH3PbBr3 is calculated as 2.08 × 10?8 m2 W?1 at room temperature under visible light illumination. The significant photostriction of CH3NH3PbBr3 is attributed to a combination of the photovoltaic effect and translational symmetry loss of the molecular configuration via strong translation–rotation coupling. Unlike CH3NH3PbI3, it is noted that the photostriction of CH3NH3PbBr3 is extremely stable, demonstrating no signs of optical decay for at least 30 d. These results suggest the potential of CH3NH3PbBr3 for applications in next‐generation optical micro‐electromechanical devices. 相似文献
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