Charge transport in structural-ordering doped organic crystals: The effect of dye-doping concentration and crystal thickness on the mobility

Charge-transport characteristics in doped organic crystals based on distyrylbenzene (DSB) as the host and tetracene (Tc) or pentacene (Pc) as the guest have been discussed in detail, including the effect factors of the guest doping concentration and the crystal thickness by the field-effect transistor (FET) and space-charge limited current (SCLC) methods. The mobilities of doped crystals are comparable to that of undoped crystal, attributed to the structural-ordering retention after the guest molecules embedding into the host crystal.