Photoreceptor is a central device in digital printers. The outer layer, Charge Transport Layer made up of polycarbonate and Charge Transport Molecule is prone to abrasion by stresses of developing system or cleaning system when it is repeatedly used in printing process. The abrasion of the photoreceptor causes deterioration of electrical properties such as lowering sensitivity or lower charging and results in irregular image such as lower image density and image stain. Single and multiple coating were made with filled and unfilled binder polymers and their modulus and hardness were measured by nano-indenter. Charge Transport Molecule reduced modulus and hardness thus increasing photoreceptor wear rate. Nano-filler silica in the polymer either polycarbonate or polyester increased modulus and hardness with higher photoreceptor life.
S.K. Ahuja, "Photoreceptor Defects, Surface Hardness and Image Quality" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP29), 2013, pp 337 - 340, https://doi.org/10.2352/ISSN.2169-4451.2013.29.1.art00019_2