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Ultrafast charge transfer coupled with lattice phonons in two-dimensional covalent organic frameworks

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Title
Ultrafast charge transfer coupled with lattice phonons in two-dimensional covalent organic frameworks
Author(s)
Tae Wu Kim; Sunhong Jun; Yoonhoo Ha; Rajesh K. Yadav; Abhishek Kumar; Chung-Yul Yoo; Inhwan Oh; Hyung-Kyu Lim; Jae Won Shin; Ryong Ryoo; Hyungjun Kim; Jeongho Kim; Jin-Ook Baeg; Hyotcherl Ihee
Publication Date
2019-04
Journal
NATURE COMMUNICATIONS, v.10, no.1, pp.1873 -
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2019, The Author(s). Covalent organic frameworks (COFs) have emerged as a promising light-harvesting module for artificial photosynthesis and photovoltaics. For efficient generation of free charge carriers, the donor–acceptor (D-A) conjugation has been adopted for two-dimensional (2D) COFs recently. In the 2D D-A COFs, photoexcitation would generate a polaron pair, which is a precursor to free charge carriers and has lower binding energy than an exciton. Although the character of the primary excitation species is a key factor in determining optoelectronic properties of a material, excited-state dynamics leading to the creation of a polaron pair have not been investigated yet. Here, we investigate the dynamics of photogenerated charge carriers in 2D D-A COFs by combining femtosecond optical spectroscopy and non-adiabatic molecular dynamics simulation. From this investigation, we elucidate that the polaron pair is formed through ultrafast intra-layer hole transfer coupled with coherent vibrations of the 2D lattice, suggesting a mechanism of phonon-assisted charge transfer
URI
https://pr.ibs.re.kr/handle/8788114/6313
ISSN
2041-1723
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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