Journal Article

Y6 Organic Thin‐Film Transistors with Electron Mobilities of 2.4 cm2 V−1 s−1 via Microstructural Tuning

Scaccabarozzi, Alberto D., Gutierrez‐Fernandez, Edgar, Solano, Eduardo, Anthopoulos, Thomas D., Martín, Jaime, Basu, Aniruddha

2022

Overview

There is a growing demand to attain organic materials with high electron mobility, μe, as current reliable reported values are significantly lower than those exhibited by their hole mobility counterparts. Here, it is shown that a well‐known nonfullerene‐acceptor commonly used in organic solar cells, that is, BTP‐4F (aka Y6), enables solution‐processed organic thin‐film transistors (OTFT) with a μe as high as 2.4 cm2 V−1 s−1. This value is comparable to those of state‐of‐the‐art n‐type OTFTs, opening up a plethora of new possibilities for this class of materials in the field of organic electronics. Such efficient charge transport is linked to a readily achievable highly ordered crystalline phase, whose peculiar structural properties are thoroughly discussed. This work proves that structurally ordered nonfullerene acceptors can exhibit intrinsically high mobility and introduces a new approach in the quest of high μe organic materials, as well as new guidelines for future materials design. n‐channel organic thin‐film transistors exhibiting electron mobility values as high as 2.4 cm2 V−1 s−1 are produced with the benchmark nonfullerene acceptor used in organic solar cell, that is, BTP‐4F (aka Y6). These properties stem from crystallization of Y6 in a crystalline structure featuring molecularly flat, highly ordered, and textured domains.

• Publisher: John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
• Subject: electron mobility / Microstructure / nonfullerene acceptors / organic thin‐film transistors / Polymorphism / Semiconductors / Transistors