AI Article Synopsis
- Large changes in vibrational energies of PCBM are observed when influenced by voltage in experiments using transport and SERS on PCBM-gold junctions.
- The study finds a mix of linear and quadratic shifts in these energies, analyzed alongside similar experiments with C60-gold junctions.
- Theoretical models indicate that both the vibrational Stark effect and junction charging explain these energy shifts, with PCBM showing notable linear Stark shifts due to its electric dipole moment.
Article Abstract
We observe large, reversible, bias driven changes in the vibrational energies of PCBM based on simultaneous transport and surface-enhanced Raman spectroscopy (SERS) measurements on PCBM-gold junctions. A combination of linear and quadratic shifts in vibrational energies with voltage is analyzed and compared with similar measurements involving C60-gold junctions. A theoretical model based on density functional theory (DFT) calculations suggests that both a vibrational Stark effect and bias-induced charging of the junction contribute to the shifts in vibrational energies. In the PCBM case, a linear vibrational Stark effect is observed due to the permanent electric dipole moment of PCBM. The vibrational Stark shifts shown here for PCBM junctions are comparable to or larger than the charging effects that dominate in C60 junctions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.nanolett.5b04340 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!