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The hole transport characteristics of molecule blends of 1,4,5,8,9 and 11-hexaazatriphenylene-hexacarbonitrile(HAT-CN):N,N’-di(naphthalene-l-yl)-N,N’-diphenyl-benzidine(NPB) and HAT-CN:4,4’-cyclohexyhdenebis[N,Nbis(4-methylphenyl)benzenamine](TAPC) with various NPB and TAPC mixing concentrations(5-90 wt%) are studied.When the concentration is in the range of 5-80 wt%,it is found that the hole conductions in the two blends are space-charge-limited current(SCLC) with free trap distributions.The current-voltage characteristics of the two blends show SCLC with exponential trap distributions at the concentration of 90wt%.The hole mobilities of the two blends are very close(10~(-4)~10~(-3) cnr~2V~(-1)s~(-1)),the dependence of electric field and temperature can be described by the modified Poole—Prcnkel model.The hole mobility and activation energy of the two blends depending on concentration are similar.
The hole transport characteristics of molecule blends of 1,4,5,8,9 and 11-hexaazatriphenylene-hexacarbonitrile (HAT-CN): N, N’-di (naphthalene- benzidine (NPB) and HAT-CN: 4,4’-cyclohexyhdenebis [N, Nbis (4-methylphenyl) benzenamine] (TAPC) with various NPB and TAPC mixing concentrations in the range of 5-80 wt%, it is found that the hole conductions in the two blends are space-charge-limited current (SCLC) with free trap distributions. The current-voltage characteristics of the two blends show SCLC with exponential trap distributions at the concentration of 90wt% .The hole mobilities of the two blends are very close (10 ~ (-4) ~ 10 ~ (-3) cnr ~ 2V -1 s -1), the dependence of electric field and temperature can be described by the modified Poole-Prcnkel model. The hole mobility and activation energy of the two blends depending on concentration are similar.