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- W963093472 abstract "Abstract The admittance spectroscopy investigations showed that doping lithium carbonate (Li 2 CO 3 ) into bis[2-(2-hydroxyphenyl)-pyridine] beryllium (Bepp 2 ) greatly improved the electron mobility compared with the pure Bepp 2 film. The electron mobility reaches the orders of ∼10 −4 cm 2 V −1 s −1 , almost independent of the electric field. The trap states at low frequencies were clearly observed by capacitance–frequency measurement. The current–voltage and current–thickness characteristics indicated the electron conduction of space-charge-limited current (SCLC) with discrete trap distributions in the intermediate voltage and the SCLC with exponential trap distribution at the higher voltage in the Li 2 CO 3 -doped Bepp 2 film. We further estimated the density of trap states to be about 4.54 × 10 17 cm −3 by the temperature dependent current density characteristics. The investigation of ultraviolet photoemission spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS) found that there occurs complicated chemical reaction between Bepp 2 and Li 2 CO 3 , and the Bepp 2 traps more electrons after Li 2 CO 3 doping. This is an effective charge transfer between Bepp 2 and Li 2 CO 3 , which greatly reduces the electron injection barrier and significantly enhances the electron mobility." @default.
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- W963093472 date "2015-11-01" @default.
- W963093472 modified "2023-10-10" @default.
- W963093472 title "Investigation of electron transport properties in Li2CO3-doped Bepp2 thin films" @default.
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- W963093472 doi "https://doi.org/10.1016/j.orgel.2015.07.023" @default.
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