Doping of organic semiconductors induced by lithium fluoride/aluminum electrodes studied by electron spin resonance and infrared reflection-absorption spectroscopy

作者：Glowacki E D; Marshall K L; Tang C W^*; Sariciftci N S

来源：Applied Physics Letters, 2011, 99(4): 043305.

DOI：10.1063/1.3615799

We report our investigations on the chemical doping mechanisms induced by LiF vertical bar Al electrodes evaporated onto fullerene thin films. Electron spin resonance (ESR) and infrared reflection-absorption spectroscopy (IRRAS) are utilized to characterize C(60)vertical bar Al and C(60)vertical bar LiF vertical bar Al interfaces. ESR spectra show that deposition of LiF followed by Al generates C(60) radical anions and also the presence of an additional paramagnetic species of lower concentration that is present in all C(60) films regardless of LiF. IRRAS clarifies the mechanism occurring at the C(60)vertical bar LiF vertical bar Al interface, showing that interaction between LiF and C(60) followed by deposition of Al causes LiF clusters to chemically dissociate.

• 出版日期2011-7-25