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Tayu, Masanori; Rahmanudin, Aiman; Perry, Gregory J. P; Khan, Raja U; Tate, Daniel J; Marcial-Hernandez, Raymundo; Shen, Yuan; Dierking, Ingo; Janpatompong, Yurachat; Aphichatpanichakul, Suphaluk; Zamhuri, Adibah; Victoria-Yrezabal, Inigo; Turner, Michael L; Procter, David J
Chemical science (Cambridge), 01/2022, Letnik: 13, Številka: 2Journal Article
A modular approach to underexplored, unsymmetrical 1benzothieno3,2- b 1benzothiophene (BTBT) scaffolds delivers a library of BTBT materials from readily available coupling partners by combining a transition-metal free Pummerer CH-CH-type cross-coupling and a Newman-Kwart reaction. This effective approach to unsymmetrical BTBT materials has allowed their properties to be studied. In particular, tuning the functional groups on the BTBT scaffold allows the solid-state assembly and molecular orbital energy levels to be modulated. Investigation of the charge transport properties of BTBT-containing small-molecule:polymer blends revealed the importance of molecular ordering during phase segregation and matching the highest occupied molecular orbital energy level with that of the semiconducting polymer binder, polyindacenodithiophene-benzothiadiazole (PIDTBT). The hole mobilities extracted from transistors fabricated using blends of PIDTBT with phenyl or methoxy functionalized unsymmetrical BTBTs were double those measured for devices fabricated using pristine PIDTBT. This study underscores the value of the synthetic methodology in providing a platform from which to study structure-property relationships in an underrepresented family of unsymmetrical BTBT molecular semiconductors. A modular approach to underexplored, unsymmetrical 1benzothieno3,2- b 1benzothiophene (BTBT) scaffolds, combining a transition-metal free Pummerer CH-CH-type cross-coupling and a Newman-Kwart reaction, delivers a library of BTBT materials.
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in: SICRIS
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