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Real- and momentum-indirect neutral and charged excitons in a multi-valley semiconductor

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National Science Open 2023年第4期2卷 76-85页

作者： Zhiheng huang Yuhui Li Tao Bo Yanchong Zhao Fanfan Wu Lu Li Yalong Yuan Yiru Ji Le Liu Jinpeng Tian Yanbang Chu {1. Zan Yalin Peng Xiuzhen Li yangkun Zhang Kenji Watanabe Takashi Taniguchi Zhipei Sun Wei yang Dongxia Shi Shixuan Du Luojun Du Guangyu Zhang beijing National Laboratory for Condensed Matter Physics Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100190China Ningbo institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 315201China Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Department of Electronics and Nanoengineering Aalto UniversityTietotie 3Espoo FI-02150Finland Quantum Technology Finland(QTF)Centre of Excellence Department of Applied PhysicsAalto UniversityAalto FI-00076Finland beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Excitons dominate the photonic and optoelectronic properties of a *** significant advancements exist in understanding various types of excitons,progress on excitons that are indirect in both real-and momentum-spaces is still ***,we demonstrate the real-and momentum-indirect neutral and charged excitons(including their phonon replicas)in a multi-valley semiconductor of bilayer MoS_(2),by performing electric-field/doping-density dependent *** with first-principles calculations,we uncover that the observed real-and momentum-indirect exciton involves electron/hole from K/Γvalley,solving the longstanding controversy of its momentum ***,the binding energy of real-and momentum-indirect charged exciton is extremely large(i.e.,~59 meV),more than twice that of real-and momentum-direct charged exciton(i.e.,~24 meV).The giant binding energy,along with the electrical tunability and long lifetime,endows real-and momentum-indirect excitons an emerging platform to study many-body physics and to illuminate developments in photonics and optoelectronics.

关键词： excitons real-and momentum-indirect exciton giant binding energy electrical tunability multi-valley semiconductor

Non-equivalent D-A copolymerization strategy towards highly efficient polymer donor for polymer solar cells

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Science china Chemistry 2021年第6期64卷 1031-1038页

作者： Ziya Shang Liuyang Zhou Chenkai Sun Lei Meng Wenbin Lai Jinyuan Zhang Wenchao {1. Yongfang Li beijing National Laboratory for Molecular {1. CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 455001China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528216China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

D-A copolymerization is a broadly utilized molecular design strategy to construct high efficiency photovoltaic materials for polymer solar cells(PSCs),and all the D-A copolymer donors reported till now are the alternate D-A copolymers with equal D-and ***,we first propose a non-equivalent D-A copolymerization strategy with unequal D-and A-units,and develop three novel non-equivalent D-A copolymer donors(PM6-D1.PM6-D2 and PM6-D3 with D/A unit ratio of 1.1.0.9,{1.:0.8 and1.3:0.7,respectively)by inserting more D units into the alternate D-A copolymer PM6 backbone to finely tune the physicochemical and photovoltaic properties of the *** three non-equivalent D-A copolymers show the down-shifted highest occupied molecular orbital(HOMO)energy levels,higher hole mobility,higher degree of molecular self-assembly and higher molecular crystallinity with the increase of D-unit ratio in comparison with the alternate D-A copolymer *** a result,all the three non-equivalent D-A copolymer-based PSCs with Y6 as acceptor achieve improved power conversion efficiency(PCE)with higher V_(oc),larger J_(sc)and higher FF ***,the PM6-D1.Y6 based PSC achieved a high PCE of1..71.,which is significantly higher than that(1..82%)of the PM6:Y6 based PSC and is one of the highest performances in the binary PSCs.

关键词： polymer solar cells conjugated polymer donor materials donor-acceptor copolymers non-equivalent D-A copolymerization

中国散裂中子源伴生质子辐照实验平台及其技术参数的确定

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现代应用物理 2024年第2期15卷 94-102页

作者：谭志新敬罕涛樊瑞睿黄良生蒋伟李强何泳成王林于永积宁常军黄蔚玲邱瑞阳曾磊孙晓阳曹秀霞马娜李论散裂中子源科学中心加速器技术部广东东莞523803 中国科学院高物理研究所东莞研究部北京100049

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(china Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测... 详细信息

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(china Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测量、束斑照相、同位素活化法等实验方法对伴生质子辐照实验平台的主要参数进行了刻度。实验证实,该辐照平台可以提供的质子能量范围为1.~80 MeV,束斑分布均匀,束流强度范围为{1.×1.^(7)~4.0×1.^(9) cm^(-2)·s^(-1.。伴生质子辐照实验平台运行稳定,每年提供超过5000 h的束流时间,可以满足宇航器件可靠性测试、探测器刻度、辐照育种以及材料抗辐照特性测试等多种应用需求。

关键词：中国散裂中子源伴生质子束负氢离子能量刻度参数测试

用于空间科学研究的基于磁阻传感器的矢量磁强计

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北京大学学报（自然科学版） 2023年第4期59卷 609-616页

作者：于向前李嘉巍肖池阶黄聪刘斯王劲东李云鹏曲亚楠王永福陈鸿飞邹鸿施伟红宗秋刚陈晓飞张效信宗位国王劲松北京大学地球与空间科学学院北京100871 中国气象局空间天气重点开放实验室/国家卫星气象中心(国家空间天气监测预警中心) 北京100081 许健民气象卫星创新中心北京100081 北京大学物理学院北京100871 长沙理工大学物理与电子科学学院长沙410114 中国科学院国家空间科学中心北京100190 山东航天电子研究所烟台264003 上海卫星工程研究所上海201108

提出一种用于空间科学研究的基于低资源消耗各项异性磁阻传感器的矢量磁强计。该矢量磁强计的探测范围为±65000 nT,–3 dB带宽为DC~1. Hz的磁场波,噪声功率谱密度≤0.2 nT/Hz^(1.2)@1.Hz,非线性误差≤3.6‱,非正交性误差≤1.2‱。该磁强... 详细信息

提出一种用于空间科学研究的基于低资源消耗各项异性磁阻传感器的矢量磁强计。该矢量磁强计的探测范围为±65000 nT,–3 dB带宽为DC~1. Hz的磁场波,噪声功率谱密度≤0.2 nT/Hz^(1.2)@1.Hz,非线性误差≤3.6‱,非正交性误差≤1.2‱。该磁强计搭载运行于太阳同步轨道的风云三号气象卫星(FY-3E),在轨初步探测结果表明,该磁强计具备探测空间磁场扰动(例如极光椭圆区的场向电流(20~60 nT))的能力。

关键词：低资源消耗磁阻传感器矢量磁强计空间科学应用