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Interplay of structural dynamics and electronic effects in an engineered assembly of pentacene in a metal–organic framework

Haldar, Ritesh; Kozlowska, Mariana; Ganschow, Michael; Ghosh, Samrat; Jakoby, Marius; Chen, Hongye; Ghalami, Farhad; Xie, Weiwei; c; Tsutsui, Yusuke; Freudenberg, Jan; Seki, Shu; Howard, Ian A.; Richards, Bryce S. ORCID iD icon; Bunz, Uwe H. F.; Elstner, Marcus; Wenzel, Wolfgang; Wöll, Christof

Charge carrier mobility is an important figure of merit to evaluate organic semiconductor (OSC) materials. In aggregated OSCs, this quantity is determined by inter-chromophoric electronic and vibrational coupling. These key parameters sensitively depend on structural properties, including the density of defects. We have employed a new type of crystalline assembly strategy to engineer the arrangement of the OSC pentacene in a structure not realized as crystals to date. Our approach is based on metal–organic frameworks (MOFs), in which suitably substituted pentacenes act as ditopic linkers and assemble into highly ordered π-stacks with long-range order. Layer-by-layer fabrication of the MOF yields arrays of electronically coupled pentacene chains, running parallel to the substrate surface. Detailed photophysical studies reveal strong, anisotropic inter-pentacene electronic coupling, leading to efficient charge delocalization. Despite a high degree of structural order and pronounced dispersion of the 1D-bands for the static arrangement, our experimental results demonstrate hopping-like charge transport with an activation energy of 64 meV dominating the band transport over a wide range of temperatures. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000131261
Veröffentlicht am 13.01.2022
DOI: 10.1039/d0sc07073d
Zitationen: 7
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Institut für Funktionelle Grenzflächen (IFG)
Institut für Mikrostrukturtechnik (IMT)
Institut für Nanotechnologie (INT)
Institut für Physikalische Chemie (IPC)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2041-6520, 2041-6539
KITopen-ID: 1000131261
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Weitere HGF-Programme 47.14.01 (POF IV, LK 01) Molekular Information Processing in Cellular Systems
Erschienen in Chemical science
Verlag Royal Society of Chemistry (RSC)
Band 12
Heft 12
Seiten 4477–4483
Vorab online veröffentlicht am 08.02.2021
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