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Lead-halide hybrid perovskite crystals have emerged as potentially materials for solar cells due to their power conversion efficiency over 20% [1]. In this work we conduct a comparative study between two hybrids (CH3NH3PbBr3 and CH3NH3Pba3) and an all-inorganic lead-halide perovskite (CsPbBr3). Both have the general ABX3 perovskite formula, with similar band gap (2.2 eV) and similar structural phase...
A strong optical Stark effect has been observed in (6,5) semiconducting single-walled carbon nanotubes by femtosecond pump-probe spectroscopy. The response is characterized by an instantaneous blueshift of the excitonic resonance upon application of pump radiation at photon energy well below the band gap. The large Stark effect is attributed to the enhanced Coulomb interactions present in these one-dimensional...
We have obtained Raman spectra of the high-energy (G) modes from individual metallic carbon nanotubes. The Raman lines are broadened to widths up to 100 cm??1, indicating strong phonon damping by electron-hole pairs.
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