Temperature Dependent Exciton Funnel Dynamics in Uniform Strain Gradient Field Observed by Time-Resolved Photoluminescence

Fu, Xuewen1; Chen, Xiang1; Jacopin, Gwenole2,3; Shahmohammadi, Mehran2; Zhang, Chuwei1; Liu, Fang1; Liu, Ren4; Ganiere, Jean-Daniel2; Liao, Zhi-Min5; Deveaud, Benoit2; Yu, Dapeng6,7

2021-11-01

10.1002/adom.202101969

Advanced Optical Materials   影响因子和分区

2195-1071

Elastic strain engineering is an important way to reversibly tune the properties of micro/nanoscale semiconductors for promising applications in the emerging advanced nanotechnologies, such as the strain enhanced high-mobility transistors, nanogenerators, etc. However, direct observation and control of energetic carrier dynamics with precise strain gradient fields remains a challenge. Here, observation of temperature-dependent exciton funnel dynamics is reported in a precisely controlled strain gradient field by time-resolved photoluminescence. An efficient exciton hopping process is revealed at picosecond time scale as the donor-bound excitons in ZnO microwires funnel along the strain gradient, which strongly depends on the temperature. Combined experiments and simulations unravel that, in addition to the exciton funnel by the strain gradient, both the excitation efficiency and emission lifetime of the excitons increase gradually from the compressive side to the tensile side due to the role of local strain regulation. The results give a clear physical picture of the energetic carrier dynamics in the strain gradient field in semiconductors, which provides a promising paradigm for the design of high-performance optoelectronic devices.

exciton emission dynamics exciton funnel temperature dependence time-resolved photoluminescence uniform strain gradient field

SCI ; EI

英语

通讯

National Key Research and Development Program of China[2020YFA0309300] ; National Natural Science Foundation of China (NSFC)[11974191] ; Natural Science Foundation of Tianjin["20JCZDJC00560","20JCJQJC00210"] ; 111 Project[B07013] ; "Fundamental Research Funds for the Central Universities", Nankai University[91923139,63213040,"C029211101"]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:000721464700001

WILEY-V C H VERLAG GMBH

20214811232027

Dynamics ; Excitons ; II-VI semiconductors ; Optoelectronic devices ; Photoluminescence ; Wide band gap semiconductors ; Zinc oxide

Thermodynamics:641.1 ; Semiconducting Materials:712.1 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Inorganic Compounds:804.2

Web of Science

1.Nankai Univ, Sch Phys, MOE Key Lab Weak Light Nonlinear Photon, Ultrafast Electron Microscopy Lab, Tianjin 300071, Peoples R China
2.Ecole Polytech Fed Lausanne EPFL, Lab Optoelect Quant, Stn 3, CH-1015 Lausanne, Switzerland
3.Univ Grenoble Alpes, Inst Neel, CNRS, Grenoble INP, F-38000 Grenoble, France
4.Peking Univ, Sch Phys, Ctr Nanooptoelect, State Key Lab Mesoscop Phys & Frontiers Sci, Beijing 100871, Peoples R China
5.Peking Univ, Yangtze Delta Inst Optoelect, Nantong 226010, Jiangsu, Peoples R China
6.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
7.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Fu, Xuewen,Chen, Xiang,Jacopin, Gwenole,et al. Temperature Dependent Exciton Funnel Dynamics in Uniform Strain Gradient Field Observed by Time-Resolved Photoluminescence[J]. Advanced Optical Materials,2021,10.

Fu, Xuewen.,Chen, Xiang.,Jacopin, Gwenole.,Shahmohammadi, Mehran.,Zhang, Chuwei.,...&Yu, Dapeng.(2021).Temperature Dependent Exciton Funnel Dynamics in Uniform Strain Gradient Field Observed by Time-Resolved Photoluminescence.Advanced Optical Materials,10.

Fu, Xuewen,et al."Temperature Dependent Exciton Funnel Dynamics in Uniform Strain Gradient Field Observed by Time-Resolved Photoluminescence".Advanced Optical Materials 10(2021).