Organic FET devices based upon latent pigments of unsubstituted diketopyrrolopyrrole or quinacridone

Abstract

Organic FETs based upon unsubstituted diketopyrrolopyrrole (DPP) or quinacridone (QA) have been fabricated, using their solvent-soluble precursors called latent pigments (t-BOC DPP and t-BOC QA) that can be also regenerated into their parent pigments by heating around 200 °C. Use of latent pigments enables us to fabricate FET devices by means of spin coating, offering a low-cost fabrication process rather than an expensive vacuum technology. The objective of the present investigation is to evaluate the performance of DPP- and QA-based FETs prepared by latent pigments. As a result, the field effect mobilities of about 7.19×10−6 and 8.23×10−6 cm2/Vs have been obtained for FET devices based upon t-BOC DPP and QA, respectively. These values are almost equivalent to those of the FETs prepared by vacuum deposition of DPP and QA: 1.43×10−5 and 1.08×10−5 cm2/Vs, respectively. The present result leads us to conclude that the latent pigment technology is a promising low-cost process to fabricate organic FETs.