Abstract
We studied the ac electrical (20 Hz ≤ v ≤ 1GHz) and magnetic properties of the molecular semiconductors lithium phthalocyanine (LiPc) and lithium phthalocyanine iodide (LiPcI) at temperatures 1.5 K ≤ T ≤ 300 K. The frequency and temperature dependence of the complex ac conductivity suggest polarons as the dominant species of charge carriers. The higher conductivity of the iodine salt can be attributed to an enhanced mobility of the polaronic charge carriers due to a better overlap of the π-orbitals along the stacking direction of the molecules. Up to 300 K the dc conductivity can be described by σ dc α exp( −( T 0/ T) 1/2), i. e. quasi one-dimensional tunneling of charge carriers is the dominant conduction process in both compounds. Preliminary electron spin resonance (ESR) experiments were performed on LiPc. A single narrow, lorentzian shaped line is observed. Below 30 K a significant decrease in linewidth appears which may indicate the onset of magnetic order or dimerization.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
