Comparison of conventional molecularly doped polymeric photoreceptors and novel liquid-crystalline systems: charge injection and charge transport

Dieter Adam; Horst Swienty; Heinz Pinsler; Manfred Lutz; Jens Bondkowski; Ingo Bleyl; Dietrich Haarer

doi:10.1117/12.290245

9 October 1997 Comparison of conventional molecularly doped polymeric photoreceptors and novel liquid-crystalline systems: charge injection and charge transport

Dieter Adam, Horst Swienty, Heinz Pinsler, Manfred Lutz, Jens Bondkowski, Ingo Bleyl, Dietrich Haarer

Author Affiliations +

Proceedings Volume 3144, Xerographic Photoreceptors and Organic Photorefractive Materials II; (1997) https://doi.org/10.1117/12.290245
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Charge-carrier transport and charge-carrier injection in mono-layers and two-layer photoreceptors with both "conventional", i. e., molecularly doped polymeric (MDP) transport layers and novel liquid-crystalline (LC) transport systems have been investigated by time-of-flight (TOF) experiments. As compared to the MDP materials, the LC model compounds showed a considerable potential towards high-speed xerographic application due to a charge-carrier mobility as high as 0,1 cm2/V s for the hexa(hexyltho)triphenylene (HHTT). In two-layer systems with MDP CTL, the formation of a sharp and well-defined interface between CGL and TL is impossible, a bulky intermediate layer is inevitable due to the wet-coating process. This results in a delayed charge-carrier injection due to space-charge effects originating from the intermediate layer. Two-layer systems with a LC CTL allow to investigate two novel aspects: (i) Since preparation of a LC CU is feasible in a solvent-free process, the formation of an ideal, i.e., sharp interface between CU and CGL is possible. Hence, charge-carrier injection from a well-defined interface can be studied. The results can be explained (i) by taking into account the different extrinsic charge-generation mechanisms for azo pigments (Azo) and phthalocyanine pigments and (ii) the different HOMO levels of Azo and phthalocyanine as compared to the HOMO-level of HHTT (ii) Due to the high charge carrier mobility, the LC CU is a "fast enough probe" to monitor time resolved injection phenomena.

Citation Download Citation

Dieter Adam, Horst Swienty, Heinz Pinsler, Manfred Lutz, Jens Bondkowski, Ingo Bleyl, and Dietrich Haarer "Comparison of conventional molecularly doped polymeric photoreceptors and novel liquid-crystalline systems: charge injection and charge transport", Proc. SPIE 3144, Xerographic Photoreceptors and Organic Photorefractive Materials II, (9 October 1997); https://doi.org/10.1117/12.290245

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