Composition Of Super-stable Organic Photoconductive Dispersion And Single-layered Device

Recently organic optoelectronic devices have attracted intensive interest among scientists and technologists because of their huge market and intriguing potential applications. Among these devices, organic photoconductor(OPC) is the only one who has been put into market in large scale. At present, scientific research and fabrication techniques of multi-layer organic photoconductor are considerable mature, and the positive single-layered device has been the research hotspot with its high performance. The purpose of this research is to prepare a super-stable organic photoconductive dispersion and fabricate high photosensitivity single-layer photoconductor. Two parts are included in this work and are described as below.In the paper, poly(acrylamide-co-styrene)(PSAM), polystyrene(PS), polyvinyl pyrrolidone(PVP), stearamide(SR) and octadecylamine(ODA) were used for the surface treatment of Y type phthalocyanine(Y-TiOPc) in dichloroethane, respectively. And then the Y-TiOPc dispersion was mixed with the solution of polycarbonate in dichloroethane containing hole-transport materials and electron-transport materials to obtain a functional suspension. Particle size, surface morphology, ? potential, transmittance and reflectance were determined to investigate the stability of the dispersion. The results indicated that PSAM/Y-TiOPc particles could be well dispered in dichloroethane with mean particle size of 199 nm, ? potential of 79 mV and stable light transmittance and reflectance in 60 days unchanging, and the dispersion system showed excellent stability.The prepartion and formulation conditions of single-layer organic photoconductor based on Y type phthalocyanine, TPD/m-TPD and DMDBQ(CGM/ETM/HTM) were studied in the paper. The results showed that the optimal conditions have been determined: using dichloroethane as the solvent, polycarbonate as film formers with its concentration of 0.10 g/ml, the best doping ratio of Y type phthalocyanine, DMDBQ and TPD/m-TPD(CGM/ETM/HTM) was 0.07:0.7:1, the single-layer devices drying at 100~110 °C for 90~100 minutes. And the positive single-layered device based on PSAM/Y-TiOPc exhibited excellent photoconductivity, V0 = 656.72 V, E1/2 = 0.16 ?J/cm2, Rd = 29.10 V/s, Vr = 71.47 V. When the dispersion were standed after 90 days, the performamce of the devices were V0 = 614.35 V,E1/2 = 0.19 ?J/cm2,Rd = 21.58 V/s,Vr = 74.06 V,showing well consistency. The dispersion and organic photoconductor exhibited high performance and stability.