Lithium doping of semiconducting organic charge transport materials
Lithium doping of semiconducting organic charge transport materials
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DOI：
10.1063/1.1359161
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发表时间：
2001-05-01
影响因子：
3.2
通讯作者：
Forrest, SR
中科院分区：
文献类型：
--
作者：
Parthasarathy, G;Shen, C;Forrest, SR
研究了有机发光器件阴极中锂离子掺入的影响。热蒸发的金属Li表面层被发现扩散并随后掺杂，电子传输的有机半导体薄膜就在阴极下方，形成欧姆接触。从电流-电压和二次离子质谱数据的分析中推断出类似于700埃的扩散长度。掺锂有机薄膜的电导率接近3 × 10(-5) S/cm。光电发射光谱表明，Li降低了有机/阴极界面的注入势垒，在有机半导体体中引入了间隙态，并掺杂了体以促进有效的电荷传输。(C) 2001年美国物理研究所。
We study the effects of lithium (Li) incorporation in the cathodes of organic light-emitting devices. A thermally evaporated surface layer of metallic Li is found to diffuse through, and subsequently dope, the electron transporting organic semiconducting thin films immediately below the cathode, forming an Ohmic contact. A diffusion length of similar to 700 Angstrom is inferred from analyses of the current-voltage and secondary ion mass spectrometry data. The conductivity of the Li-doped organic films is similar to 3x10(-5) S/cm. Photoemission spectroscopy suggests that Li lowers the barrier to injection at the organic/cathode interface, introduces gap states in the bulk of the organic semiconductor, and dopes the bulk to facilitate efficient charge transport. (C) 2001 American Institute of Physics.