Solution-Grown, Macroscopic Organic Single Crystals Exhibiting Three-Dimensional Anisotropic Charge-Transport Properties

Macroscopic single crystals of 4-hydroxycyanobenzene (4HCB) grown from solution exhibit reproducible and marked 3D mobility anisotropy. Air-gap OFET measurements along the planar axes a and b deliver average mobilities of 3 x 10(-2) and 6 x 10(-3) cm(2) V-1 s(-1), respectively. Spacecharge-limited current (SCLC) experiments reveal an average mobility along the c axis of 4 x 10(-6) cm(2) V-1 s(-1).