Oxygen-Induced Lattice Strain for High-Performance Organic Transistors with Enhanced Stability.

Integrating the merits of low cost, flexibility, and large-area processing, organic semiconductors (OSCs) are promising candidates for next-generation electronic materials. The mobility and stability are the key figure of merit for its practical application. However, it is greatly challenging to improve the mobility and stability simultaneously owing to the weak interactions and poor electronic coupling between OSCs molecules. Here, we developed an oxygen-induced lattice strain (OILS) strategy to achieve OSCs with both high-mobility and high-stability. Utilizing the strategy, the maximum mobility of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) organic field-effect transistor (OFET) rises to 15.3 cm 2 V -1 s -1 and the contact resistance lowers to 25.5 Ω·cm. Remarkably, the thermal stability of DNTT is much improved, and a record saturated power density of approximately 3.4×10 4  W cm -2 is obtained. Both the experiments and theoretical calculations demonstrate that the lattice compressive strain induced by oxygen is responsible for the high performance and stability. Furthermore, the universality of the strategy is manifested in both n-type and p-type small OSCs. This work provides a novel strategy to improve both the mobility and the stability of OSCs, paving the way for the practical applications of organic devices. This article is protected by copyright. All rights reserved.