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Observation of ultrafast electrons in pendant-embedded conducting two-dimensional polymers

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Title
Observation of ultrafast electrons in pendant-embedded conducting two-dimensional polymers
Author(s)
Yeonsang Lee; Minhyuk Choi; Park, Ina; In-Chul Hwang; Sk. Atiur Rahaman; Shin, Hee Jun; Giri, Pritam; Moon-Ho Jo; Kangkyun Baek; Hwang, Ilha; Shim, Ji Hoon; Jun Sung Kim; Kimoon Kim
Publication Date
2024-04
Journal
CHEM, v.10, no.4, pp.1160 - 1174
Publisher
CELL PRESS
Abstract
Conducting two-dimensional polymers (C2Ps) are appealing for their extended π-conjugation over the second dimension, yet the exploration of C2Ps with fused aromatic linkages is hindered by strong stacking between adjacent layers. Here, we report a C2P equipped with bulky pendant groups to suppress the interlayer stacking and increase solubility of growth intermediates, resulting in outstanding electrical conductivity after p-type doping. Remarkably, magnetotransport measurements revealed that coherent multi-carrier transport with finite n-type carriers show exceptionally high mobility over 3,200 cm2 V−1 s−1 and long phase coherence length surpassing 100 nm, in stark contrast to hole-carrier transport with 25,000 times lower mobility at low temperatures. This dramatic disparity between electron and hole-carrier transport is attributed to spatially separated electronic states near the Fermi level, which consists of dispersive and flat bands. Our findings highlight the pivotal role of bulky pendant groups in achieving high solubility, Dirac band engineering, and conduction pathway design. © 2023 Elsevier Inc.
URI
https://pr.ibs.re.kr/handle/8788114/15086
DOI
10.1016/j.chempr.2023.12.007
ISSN
2451-9308
Appears in Collections:
Center for Self-assembly and Complexity(복잡계 자기조립 연구단) > 1. Journal Papers (저널논문)
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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