Charge-Transfer Complexes of Benzothienobenzothiophene with Tetracyanoquinodimethane and the n-Channel Organic Field-Effect Transistors

n-Channel organic transistors with excellent air stability are realized on the basis of charge-transfer complexes, (BTBT)(TCNQ), (BTBT)(F(2)TCNQ), (BSBS)(F(2)TCNQ), and (BTBT)(F(4)TCNQ), where BTBT is benzothieno[3,2-b]benzothiophene, BSBS is benzoseleno[3,2-b]benzoselenophene, and F(n)TCNQ (n = 0, 2, and 4) are fluorinated 7,7,8,8-tetracyanoquinodimethanes. These complexes consist of mixed stacks of essentially neutral molecules, and the transistors are air stable even after several-month storage in ambient conditions.