Conduction studies in anthraquinone derivatives. VI

Abstract

Contrary to the results of the early 1960s, it has been found that the anthraquinone (AQ) and its derivatives can be made photoconductive (Iph/ID≈ 103) by substituting suitable donors in the periphery of the benzenoid rings. The conductivity of the AQ derivatives, generally speaking, are not as good as those of the charge transfer kind. The darkcurrent in the case of AQ derivatives ranges from 10−14–10−12 for 9,10-AQ to 10−10–10−8 for 1,4,5,8-tetra amino AQ. The AQs are n-type semiconductors with electrons being the majority charge carriers. In the present article, we describe the charge carrier generation and transport processes in three di-substituted AQ derivatives whose spectral properties have been well studied. The magnetic field effect has been observed for the first time in these compounds.