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Effect of CuPc and MoO3 co-evaporated layer on the conductivity of organic light emitting diodes

Author:
He Ze-Shang  Yu Hao-Miao  Peng Huan  Hou Xiao-Yuan  


Journal:
CHINESE PHYSICS B


Issue Date:
2015


Abstract(summary):

Devices with copper phthalocyanine (CuPc):molybdenum trioxide (MoO3) co-evaporated layer were fabricated and the current-voltage (I-V) and capacitance-voltage (C-V) characteristics were measured. It has been found that for a given voltage, the current of the device with a co-evaporated layer is higher than those without the co-evaporated layer and it reaches the highest value if the ratio of MoO3 to CuPc is 1:1. Meanwhile, the C-V characteristics showed that only free holes exist in the function layer consisting of pure CuPc. However, charge transfer (CT) complexes exist in the function layer of a CuPc:MoO3 mixture. The charge transfer complexes do not contribute to the transport of the device efficiently under low applied fields but are disassociated into free carriers rapidly at applied fields higher than 1.7 x 10(5) V/cm, which greatly increases the conductivity.


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