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Controlling the Microstructure of Conjugated Polymers in High‐Mobility Monolayer Transistors via the Dissolution Temperature
Author(s) -
Li Mengmeng,
Bin Haijun,
Jiao Xuechen,
Wienk Martijn M.,
Yan He,
Janssen René A. J.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201911311
Subject(s) - monolayer , polymer , dissolution , materials science , conjugated system , chemical engineering , chemistry , stacking , electron mobility , nanotechnology , organic chemistry , optoelectronics , engineering
It remains a challenge to precisely tailor the morphology of polymer monolayers to control charge transport. Herein, the effect of the dissolution temperature ( T dis ) is investigated as a powerful strategy for morphology control. Low T dis values cause extended polymer aggregation in solution and induce larger nanofibrils in a monolayer network with more pronounced π–π stacking. The field‐effect mobility of the corresponding monolayer transistors is significantly enhanced by a factor of four compared to devices obtained from high T dis with a value approaching 1 cm 2 V −1 s −1 . Besides that, the solution kinetics reveal a higher growth rate of aggregates at low T dis , and filtration experiments further confirm that the dependence of the fibril width in monolayers on T dis is consistent with the aggregate size in solution. The generalizability of the T dis effect on polymer aggregation is demonstrated using three other conjugated polymer systems. These results open new avenues for the precise control of polymer aggregation for high‐mobility monolayer transistors.