High charge-carrier mobility and low trap density in a rubrene derivative

Ciba Specialty Chemistry Inc., 4002 Basel, Switzerland(Dated: February 1, 2008)We have synthesized, crystallized and studied the structural and electric transport properties oforganic molecular crystals based on a rubrene derivative with t-butyl sidegroups at the 5,11 posi-tions. Two crystalline modifications are observed: one (A) distinct from that of rubrene with largerspacings between the naphtacene backbones, the other (B) with a in-plane structure presumablyvery similar compared to rubrene. The electric transport properties reflect the different structures:in the latter phase (B) the in-plane hole mobility of 12cm

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