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2015年全国高分子学术论文报告会

作者：阳军亮 Jian Xiong Qiao Hu Runsheng Wu Yongli Gao Institute of Super-microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South University Department of Physics and Astronomy University of Rochester

Organic solar cells continuously attract attention due to their potential as low cost and lightweight sources of renewable *** power conversion efficiency(PCE) of state-of-the-art organic solar cells,based on bulk heterojuction and tandem structures,can reach over 10.0%,as result of progress in new materials,device engineering,device physics,***,there has been an unexpected breakthrough and rapid evolution of highly efficient solar cells based on organic-inorganic hybrid perovskite *** large-area organic solar cells processed by R2 R printing or coating techniques still have many issues,and the PCE of large-area OPV modules is much lower than those of smaller,spin-coated *** interface is one of the important issues that influence both small-size and printed large-area organic and perovskite solar cell ***,we show our research on the solution-processed interface materials for organic and perovskite solar cells as well as the fabrication of their modules by R2 R printing *** is very important to obtain high-quality interface materials for improving the performance and stability of these solar cells,as well as optimizing printed thin films and printed modules.

关键词： Interface Organic Solar Cells Perovskite Solar Cells TiO2 NPs

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Electronic and transport properties of V-shaped defect zigzag MoS_2 nanoribbons

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Chinese Physics B 2014年第4期23卷 557-561页

作者：李新梅龙孟秋崔丽玲肖金徐慧 Institute of Super-microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South University School of Science Hunan University of Technology

Based on the nonequilibrium Green＇s function （NEGF） in combination with density functional theory （DFT） calcu- lations, we study the electronic structures and transport properties of zigzag MoS2 nanoribbons （ZMNRs） with V-shaped vacancy defects on the edge. The vacancy formation energy results show that the zigzag vacancy is easier to create on the edge of ZMNR than the armchair vacancy. Both of the defects can make the electronic band structures of ZMNRs change from metal to semiconductor. The calculations of electronic transport properties depict that the currents drop off clearly and rectification ratios increase in the defected systems. These effects would open up possibilities for their applications in novel nanoelectronic devices.

关键词： transport property zigzag MoS2 nanoribbons V-shaped defect first-principles

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Random Copolymers Based on Thieno[3,4-c]pyrrole-4,6-dione and Isoindigo Building Blocks for Polymer Solar Cells

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Chinese Journal of Chemistry 2014年第6期32卷 521-526页

作者： Ping Deng Jian Xiong Shugang Li Yibing Wu Junliang Yang Qing Zhang School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Super Microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South UniversityChangshaHunan 410083China

Three random conjugated polymers,RP-TiI,RP-2TiI and RP-TVTiI based on both thieno[3,4-c]pyrrole-4,6-dione and isoindigo units have been synthesized by Stille cross-coupling *** optical and electrochemical properties of new polymers have been *** resulted polymers showed broad absorption spectra and appropriate energy levels for polymer solar cell *** bulk heterojunction devices based on the blend of the polymer RP-TiI and PC_(61)BM showed a power conversion efficiency of 1.75%.

关键词： thieno[3,4-c]pyrrole-4 6-dione isoindigo random copolymers polymer solar cells

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Polarization dependent nonlinear absorption in Au nanowire array

Polarization dependent nonlinear absorption in Au nanowire a...

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作者： Xing, Ruo Chen Xiao, Si He, Jun Institute of Super-microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University Changsha 410083 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University Changsha 410083 China

ISBN: (纸本)9783038351214

The polarization dependent nonlinear absorption was observed in ordered Au nanowire array. The linear and nonlinear polarized absorption at 780 nm is investigated by Z-scan. When the angle between the polarization direction of input laser and the long axis of Au nanowires is 90°(perpendicular), the linear absorption reaches the maximum and the nonlinear absorption reaches the minimum. The nonlinear absorption coefficient β decreases from positive to negative as the angle increase from 0° to 90°. There may be two nonlinear absorption mechanisms resulting in this phenomenon: two-photon absorption and saturable absorption in nanoscale. © (2014) Trans Tech Publications, Switzerland.

关键词： Polarization

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Characteristics research of gallium arsenide solar cells under femtosecond laser illumination

Characteristics research of gallium arsenide solar cells und...

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作者： Xiao, Si Gao, Yi Tan Tian, Xiu Qin He, Jun Institute of Super-microstructure and Ultrafast Process in Advanced Materials Department of Physics and Electronics Central South University Changsha 410083 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University Changsha 410083 China

ISBN: (纸本)9783038351214

Femtosecond laser with ultrashort pulse (≤35fs) is used to investigate the damage threshold and light-to-electric conversion efficiency of gallium arsenide solar cells. Different from nanosecond or picosecond lasers, the damage threshold of the solar cell illuminated by femtosecond laser is slightly higher than that under the illumination of continuous-waves laser with the same wavelength. Because the thermal non-equilibrium effect becomes obvious, heat conduction phenomenon no longer obeys the law of Fourier, when the heating pulse time of femtosecond laser is equal to or shorter than the electron- phonon coupling time. The photovoltaic properties of gallium arsenide solar cells under femtosecond pulse laser illumination are measured. The device shows better short circuit current and the light-to-electric conversion efficiency under femtosecond pulse laser than that under continuous-waves laser of the same wavelength. © (2014) Trans Tech Publications, Switzerland.

关键词： Solar cells

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Pulsed Lasers: Pulsed Lasers Employing Solution‐processed Plasmonic Cu3−xP Colloidal Nanocrystals (Adv. Mater. 18/2016)

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advanced materials 2016年第18期28卷

作者： Zeke Liu Haoran Mu Si Xiao Rongbin Wang Zhiteng Wang Weiwei Wang Yongjie Wang Xiangxiang Zhu Kunyuan Lu Han Zhang Shuit‐Tong Lee Qiaoliang Bao Wanli Ma Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices Soochow University Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University 199 Ren‐Ai Road Suzhou Industrial Park Suzhou Jiangsu 215123 China Institute of Super‐Microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Hunan Key Laboratory for Super‐Microstructure and Ultrafast Process Central South University Changsha 410083 China SZU‐NUS Collaborative Innovation Center for Optoelectronic Science and Technology and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

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Photocathodes: Black Phosphorus Based Photocathodes in Wideband Bifacial Dye‐Sensitized Solar Cells (Adv. Mater. 40/2016)

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advanced materials 2016年第40期28卷

作者： Ying Yang Jing Gao Zheng Zhang Si Xiao Han‐Han Xie Zheng‐Bo Sun Jia‐Hong Wang Cong‐Hua Zhou Ying‐Wei Wang Xue‐Yi Guo Paul K. Chu Xue‐Feng Yu School of Metallurgy and Environment Central South University Changsha 410083 P. R. China Institute of Super‐microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University Changsha 410083 P. R. China Institute of Biomedicine and Biotechnology Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China Department of Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China

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Reduction of single-photon emission from a single-emitter system by intersystem crossing

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Physical Review A 2014年第1期89卷 013839-013839页

作者： Yong He Lin Dai []Institute of Super Microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University Changsha 410012 Hunan China

We investigate the reduction in the probability of single-photon emission from a single-emitter system caused by intersystem crossing. The physical model is that a single-emitter system with three levels is excited by a square pulse laser, and then a single photon is emitted at a controllable time. We find that the intersystem crossing always reduces the probability of single-photon emission. We obtain quantitative and analytical expressions for the probabilities of zero-, one-, and two-photon emission and Mandel's Q parameter as the function of the intersystem crossing rate under the conditions of finite field strength and finite interaction time with the laser pulse. We discuss the conditions for obtaining the maximal probability of single-photon emission in the presence of intersystem crossing. We find that one can obtain a high probability of single-photon emission from the single-emitter system using square pulse excitation in comparison with continuous wave excitation. Mandel's Q parameter exhibits a transition from a sub-Poissonian behavior to a super-Poissonian behavior due to the influence of intersystem crossing. The calculated Mandel's Q parameter and second-order correlation function of photon emission considering the coherent effect are in better agreement with the experimental data.

关键词： PHOTON emission INTERSYSTEM crossing (Chemistry) PROBABILITY theory CORRELATION (Statistics) LASER optical pulse COHERENT scattering

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2D co-catalytic MoS2 nanosheets embedded with 1D TiO2 nanoparticles for enhancing photocatalytic activity

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Journal of Physics D: Applied Physics 2016年第31期49卷

作者： Xiaohui Ren Xiang Qi Yongzhen Shen Si Xiao Guanghua Xu Zhen Zhang Zongyu Huang Jianxin Zhong Hunan Key Laboratory of Micro-Nano Energy Materials and Devices Xiangtan University Hunan 411105 People's Republic of China Laboratory for Quantum Engineering and Micro-Nano Energy Technology and School of Physics and Optoelectronic Xiangtan University Hunan 411105 People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen 518060 People's Republic of China School of Physics and Optoelectronics Xiangtan University Hunan 411105 People's Republic of China. Institute of Super-microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University 932 South Lushan Road Changsha Hunan 410083 People's Republic of China

2D photocatalytic TiO2/MoS2 hybrid nanosheets (HNs) have been prepared via a facile hydrothermal process. X-ray diffraction patterns and Raman spectra are carried out and confirm a well crystalized anatase and 2H-MoS2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating the relatively stability of the MoS2 nanosheet platform with a high specific surface area. UV–vis spectra and electrochemical impedance spectra exhibit an enhanced light absorption ability and conductivity of TiO2/MoS2 compared to that of just TiO2. Photoelectrochemical (PEC) tests also demonstrate the photocurrent of 20 : 1 TiO2/MoS2 HNs is greatly improved compared to that of as-prepared TiO2. The saturation current density is about 33 µA cm−2 when the applied potential is 0.2 V, which is nearly twice that of pure TiO2 and four times as high as 5 : 1 TiO2/MoS2 HNs and 1 : 1 TiO2/MoS2 HNs. Besides that, the duration test exhibits no detectable distinction after processing 25 cycles. The improved photocatalytic activities are perhaps derived from the high conductivity and the increased active sites for the introduction of co-catalytic MoS2 nanosheets as well as the positive synergetic effect between the TiO2 and MoS2. This work demonstrates that the as-prepared TiO2/MoS2 HNs may have a great potential application in PEC hydrogen production.

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Effects of Van der Waals interaction and electric field on the electronic structure of bilayer MoS2

Effects of Van der Waals interaction and electric field on t...

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中国化学会第十二届全国量子化学会议

作者： Jin Xiao Mengqiu Long Xinmei Li Qingtian Zhang Hui Xu K.S.Chan Institute of Super-microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South University Department of Physics and Materials Science City University of Hong Kong

The modification of the electronic structure of bilayer Mo S2 by an external electric field can have potential applications in optoelectronics and ***,the underlying physical mechanism is not clearly understood,especially the effects of the Van der Waals *** this study,the spin orbit coupled electronic structure of bilayer Mo S2 has been investigated using the first-principle density functional *** find that the Van der Waals interaction as well as the interlayer distance have significant effects on the band *** the interlayer distance of bilayer Mo S2 increases from 0.614 nm to 0.71 nm,the indirect gap between the г and T points increases from 1.25 e V to 1.70 e ***,the energy gap of bilayer Mo S2 transforms from an indirect one to a direct *** external electric filed can shift down（up）the energy bands of the bottom（top）Mo S2 layer,and also breaks the inversion symmetry of bilayer Mo *** a result,the electric field can affect the band gap and the spin-orbit interaction splitting are also modified by the external electric field,when the valance bands are split into two groups of *** present study can help us understand more about the electronic structures of Mo S2 materials for potential applications in electronics and optoelectronics.

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