钙钛矿层的品质极大影响钙钛矿太阳能电池性能. 然而,在溶液法生成多晶钙钛矿膜过程中会不可避免地形成缺陷和陷阱位. 通过在钙钛矿层中嵌入添加物改善钙钛矿晶化,用于减少和钝化缺陷是非常重要的. 本文合成一种环境友好的二维纳米材料质子化石墨相氮化碳(p-g-C掺杂质子化石墨相氮化碳增强碳基太阳能电池中钙钛矿的结晶质量Enhanced Crystal Quality of Perovskite via Protonated Graphitic Carbon Nitride Added in Carbon-Based Perovskite Solar Cells郭明星;刘文超;黄均妍;刘佳琦;尹淑慧;冷静Mingxing Guo;Wenchao Liu;Junyan Huang;Jiaqi Liu;Shuhui Yin;Jing Lenga.大连海事大学环境科学与工程学院,大连 116026;b.大连海事大学理学院,大连 116026;c.中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连 116023a.College of Environment Science and Engineering, Dalian Maritime University, Dalian 116026, China;b.College of Science, Dalian Maritime University, Dalian 116026, China;c.The State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116026, China钙钛矿层的品质极大影响钙钛矿太阳能电池性能. 然而,在溶液法生成多晶钙钛矿膜过程中会不可避免地形成缺陷和陷阱位. 通过在钙钛矿层中嵌入添加物改善钙钛矿晶化,用于减少和钝化缺陷是非常重要的. 本文合成一种环境友好的二维纳米材料质子化石墨相氮化碳(p-g-CPerovskite solar cell; Carbon counter electrode; p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document}; Crystal quality; Photoelectric performance2021-11-222022-03-03The quality of perovskite layers has a great impact on the performance of perovskite solar cells (PSCs). However, defects and related trap sites are generated inevitably in the solution-processed polycrystalline perovskite films. It is meaningful to reduce and passivate the defect states by incorporating additive into the perovskite layer to improve perovskite crystallization. Here an environmental friendly 2D nanomaterial protonated graphitic carbon nitride (p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document}) was successfully synthesized and doped into perovskite layer of carbon-based PSCs. The addition of p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document} into perovskite precursor solution not only adjusts nucleation and growth rate of methylammonium lead tri-iodide (MAPbIbegin{document}$_3$end{document}) crystal for obtaining flat perovskite surface with larger grain size, but also reduces intrinsic defects of perovskite layer. It is found that the p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document} locates at the perovskite core, and the active groups -NHbegin{document}$_2$end{document}/NHbegin{document}$_3$end{document} and NH have a hydrogen bond strengthening, which effectively passivates electron traps and enhances the crystal quality of perovskite. As a result, a higher power conversion efficiency of 6.61% is achieved, compared with that doped with g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document} (5.93%) and undoped one (4.48%). This work demonstrates a simple method to modify the perovskite film by doping new modified additives and develops a low-cost preparation for carbon-based PSCs.Shuhui Yin, E-mail: yinsh@dlmu.edu.cnhttp://cjcp.ustc.edu.cn/hxwlxb/article/doi/10.1063/1674-0068/cjcp2111243http://cjcp.ustc.edu.cn/article/checkArticlePdfid=b2775e2b-641e-4422-8eeb-4a4c77f71830http://cjcp.ustc.edu.cn/hxwlxb/article/doi/10.1063/1674-0068/cjcp2111243yinsh@dlmu.edu.cn,bchen63@163.com2023-05-11 08:25:21钙钛矿太阳能电池;碳对电极;p-g-CPerovskite solar cell; Carbon counter electrode; p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document}; Crystal quality; Photoelectric performance2021-11-222022-03-03The quality of perovskite layers has a great impact on the performance of perovskite solar cells (PSCs). However, defects and related trap sites are generated inevitably in the solution-processed polycrystalline perovskite films. It is meaningful to reduce and passivate the defect states by incorporating additive into the perovskite layer to improve perovskite crystallization. Here an environmental friendly 2D nanomaterial protonated graphitic carbon nitride (p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document}) was successfully synthesized and doped into perovskite layer of carbon-based PSCs. The addition of p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document} into perovskite precursor solution not only adjusts nucleation and growth rate of methylammonium lead tri-iodide (MAPbIbegin{document}$_3$end{document}) crystal for obtaining flat perovskite surface with larger grain size, but also reduces intrinsic defects of perovskite layer. It is found that the p-g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document} locates at the perovskite core, and the active groups -NHbegin{document}$_2$end{document}/NHbegin{document}$_3$end{document} and NH have a hydrogen bond strengthening, which effectively passivates electron traps and enhances the crystal quality of perovskite. As a result, a higher power conversion efficiency of 6.61% is achieved, compared with that doped with g-Cbegin{document}$_3$end{document}Nbegin{document}$_4$end{document} (5.93%) and undoped one (4.48%). This work demonstrates a simple method to modify the perovskite film by doping new modified additives and develops a low-cost preparation for carbon-based PSCs.Shuhui Yin, E-mail: yinsh@dlmu.edu.cnhttp://cjcp.ustc.edu.cn/hxwlxb/article/doi/10.1063/1674-0068/cjcp2111243http://cjcp.ustc.edu.cn/article/checkArticlePdfid=b2775e2b-641e-4422-8eeb-4a4c77f71830http://cjcp.ustc.edu.cn/hxwlxb/article/doi/10.1063/1674-0068/cjcp2111243yinsh@dlmu.edu.cn,bchen63@163.com2023-05-11 08:25:21钙钛矿太阳能电池;碳对电极;p-g-C$_3$N$_4$;结晶质量;光电性能2022-04-27钙钛矿层的品质极大影响钙钛矿太阳能电池性能. 然而,在溶液法生成多晶钙钛矿膜过程中会不可避免地形成缺陷和陷阱位. 通过在钙钛矿层中嵌入添加物改善钙钛矿晶化,用于减少和钝化缺陷是非常重要的. 本文合成一种环境友好的二维纳米材料质子化石墨相氮化碳(p-g-C掺杂质子化石墨相氮化碳增强碳基太阳能电池中钙钛矿的结晶质量Enhanced Crystal Quality of Perovskite via Protonated Graphitic Carbon Nitride Added in Carbon-Based Perovskite Solar Cells郭明星;刘文超;黄均妍;刘佳琦;尹淑慧;冷静Mingxing Guo;Wenchao Liu;Junyan Huang;Jiaqi Liu;Shuhui Yin;Jing Lenga.大连海事大学环境科学与工程学院,大连 116026;b.大连海事大学理学院,大连 116026;c.中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连 116023a.College of Environment Science and Engineering, Dalian Maritime University, Dalian 116026, China;b.College of Science, Dalian Maritime University, Dalian 116026, China;c.The State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116026, China钙钛矿层的品质极大影响钙钛矿太阳能电池性能. 然而,在溶液法生成多晶钙钛矿膜过程中会不可避免地形成缺陷和陷阱位. 通过在钙钛矿层中嵌入添加物改善钙钛矿晶化,用于减少和钝化缺陷是非常重要的. 本文合成一种环境友好的二维纳米材料质子化石墨相氮化碳(p-g-C$_3$N$_4$),并掺杂于碳基钙太阳能电池的钙钛矿层中. 实验证明,在钙钛矿前驱体溶液中添加p-g-C$_3$N$_4$不仅能调解碘铅甲胺(MAPbI$_3$)结晶的成核和生长速率,获得大晶粒尺寸的平滑表面,还能减少钙钛矿层的本征缺陷. 质子化过程在氮化碳表面引入活性基团-NH$_2$/-NH$_3$,它们和钙钛矿晶体表面N$-$H键发生强化学作用,有效地钝化电子陷阱,提高钙钛矿结晶质量. 结果表明,与不掺杂的对照电池(效率为4.48%)和掺杂石墨相氮化碳(g-C$_3$N$_4$)电池(效率为5.93%)相比,掺杂质子化石墨相氮化碳(p-g-C$_3$N$_4$)的电池获得了6.61%的较高效率. 本工作展示了一种通过掺杂改性添加物改善钙钛矿膜的简单方法,为碳基钙钛矿太阳能电池的低成本制备提供了建议. 相似文献
Structural, magnetic and magnetotransport properties of La0.7−xCexBa0.3MnO3 (x = 0–0.4) have been investigated although some unreacted secondary phases of CeO2 were present. The rhombohedral structure (R-3c) forx = 0 transforms to orthorhombic with the space groupImma forx = 0.3. All samples showed ferromagnetic transition above 300 K and a negative magnetoresistance. For x>0.1, magnetization
data measured at 1 T showed a decrease at low temperatures (T < 50 K) due to antiferro-magnetic coupling between Ce-local moments and Mn-moments. Forx = 0.4, the resistivity showed a maximum around 200 K which corresponds to ordering temperature of cerium. Since these results
are similar to that observed in the Sr-containing La0.5−xCexSr0.5MnO3 (x = 0–0.4) system, we suggest that the cerium ions are in the trivalent state and the anomalous behaviour has been attributed
to a Kondo-like effect.
Dedicated to Prof J Gopalakrishnan on his 62nd birthday. 相似文献
AbstractIn this work, La0.75Ca0.25FeO3?δ perovskite sample was prepared by the coprecipitation method. The nanoparticle was found to crystallize in the orthorhombic (Pbnm) phase as confirmed by X-ray diffraction (XRD) and transmission electron microscopic (TEM). The oxygen non-stoichiometry (δ) and magnetic states of iron ions (three magnetic sextets and non-magnetic doublet) were investigated by Mössbauer spectroscopy at room temperature (RT). The shape of the magnetic hysteresis loop of the sample reveals the existence of a weak ferromagnetism at RT. The magnetization vs. temperature curves, measured in the 9 to 200 K range, showed that the sample exhibits two magnetic-phase transition temperatures at 29 K (Tg) and 120 K (TCO). The magnetization isotherms, M (H), around these magnetic-phase transition temperatures for the sample are analyzed. 相似文献
The properties of manganite/ruthenate superlattices are reviewed with a specific focus on the manganite/ruthenate interface. La0.7Sr0.3MnO3/SrRuO3 and Pr0.7Ca0.3MnO3/SrRuO3 superlattices grow with a high crystalline perfection as illustrated in the figure to the right: at the interface the individual cation species can be clearly identified, interdiffusion is marginal. The superlattices show magnetization processes with an intricate interplay between magnetocrystalline anisotropy, size of the layer magnetization, spin confinement and interfacial antiferromagnetic interlayer coupling. There is further an unprecedented Curie temperature stabilization at room temperature values of the La0.7Sr0.3MnO3 layers in the superlattices down to layer thicknesses of one unit cell. The magnetotransport properties, especially the Hall effect, indicate the existence of a quasi‐two‐dimensional hole gas at the La0.7Sr0.3MnO3/SrRuO3 interface; this is further supported by an analysis of cation displacements as determined from scanning transmission electron microscopy. The manganite/ruthenate interface might be considered as a model system for the study of interfacial reconstruction and charge transfer in a highly correlated ferromagnetic system.
Effects of interface decoration and ac frequency, under which the impedance is measured, on the magnetoelectric property have been experimentally studied for the heterojunctions of La0.5Ca0.5MnO3/SrTiO3:Nb and La0.5Ca0.5MnO3/LaMnO3(3nm)/SrTiO3:Nb. It is found that the impedance of the junction can be well described by an effective circuit of two R–C sub‐circuits in series well above 100 K. Magnetocapacitance emerges and develops as temperature decreases, and shows a strong frequency‐dependent character. The maximal magnetocapacitance, under a field of 5 T, is ∼30 and ∼35% with and without the buffer layer, respectively. The incorporation of the LaMnO3 layer shifts the upper temperature limit for significant magnetocapacitance from ∼120 to ∼200 K. Shrinkage of the depletion layer of the junction under magnetic field may be a main reason for the magnetoelectric effect observed here. 相似文献
The effects of heat‐treatment temperature, THT, and heat‐treatment time, tHT, on the structural and magnetic properties of manganites with a nominal composition La0.6Sr0.1MnO3−δ, prepared by the sol–gel method, were investigated. The XRD spectra indicate that the samples have two phases with the perovskite being the dominant phase and Mn3O4 being the second phase. It was found that the Curie temperature of the samples varies as THT and tHT are changed. Calculation of the ion content ratios at the A, B, and O sites in the ABO3 perovskite phase on the basis of the thermal equilibrium theory of crystal defects, and Rietveld fitting of X‐ray powder diffraction data lead us to believe that the origin of this variation is due to the fact that the vacancy content, z, at B‐sites in the ABO3 perovskite phase increases as THT and tHT increase. The calculations also show that the samples are double‐phase compositions of La0.6Sr0.1Mn1−yO1.5(1.7‐y+z)/(Mn3O4)y/3. 相似文献
