Heterogeneous Exciton Dynamics Revealed by Two-Dimensional Optical Spectroscopy†

2006 ◽  
Vol 110 (40) ◽  
pp. 20032-20037 ◽  
Author(s):  
Igor Stiopkin ◽  
Tobias Brixner ◽  
Mino Yang ◽  
Graham R. Fleming
Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7402-7408 ◽  
Author(s):  
Long Yuan ◽  
Libai Huang

We systematically investigate the exciton dynamics in monolayered, bilayered, and trilayered WS2 two-dimensional (2D) crystals by time-resolved photoluminescence (TRPL) spectroscopy.


2020 ◽  
Author(s):  
Nathan C. Flanders ◽  
Matthew S. Kirschner ◽  
Pyosang Kim ◽  
Thomas Fauvell ◽  
Austin Evans ◽  
...  

<p>Large singlet exciton diffusion lengths are a hallmark of high performance in organic based devices such as photovoltaics, chemical sensors, and photodetectors. In this study, exciton dynamics of a two-dimensional covalent organic framework, COF- 5, is investigated using ultrafast spectroscopic techniques. Following photoexcitation, the COF-5 exciton decays via three pathways: 1) excimer formation (4 ± 2 ps), 2) excimer relaxation (160 ± 40 ps), and 3) excimer decay (>3 ns). Excitation fluence-dependent transient absorption studies suggest that COF-5 has a relatively large diffusion coefficient (0.08 cm2/s). Furthermore, exciton-exciton annihilation processes are characterized as a function of COF-5 crystallite domain size in four different samples, which reveal domain- size dependent exciton diffusion kinetics. These results reveal that exciton diffusion in COF-5 is constrained by its crystalline domain size. These insights indicate the outstanding promise of delocalized excitonic processes available in 2D COFs, which motivate their continued design and implementation into optoelectronic devices. </p>


2015 ◽  
Vol 106 (3) ◽  
pp. 031902 ◽  
Author(s):  
N. Kamaraju ◽  
W. Pan ◽  
U. Ekenberg ◽  
D. M. Gvozdić ◽  
S. Boubanga-Tombet ◽  
...  

2020 ◽  
Vol 101 (4) ◽  
Author(s):  
Kwang Jin Lee ◽  
Wei Xin ◽  
Chunhao Fann ◽  
Xinli Ma ◽  
Fei Xing ◽  
...  

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