𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Transient Photocurrent Studies on Amorphous andβ-Rhombohedral Boron

✍ Scribed by Masatoshi Takeda; Kaoru Kimura; Kazuro Murayama

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
272 KB
Volume
133
Category
Article
ISSN
0022-4596

No coin nor oath required. For personal study only.

✦ Synopsis

Carrier transport properties in amorphous and -rhombohedral boron were studied by the time of flight method. The activation energy for holes in -rhombohedral boron was estimated to be 240 meV. This activation energy corresponds to the depth of hole traps originating from B 12 , that is, the intrinsic acceptor level. Dispersive (non-Gaussian) transient photocurrents were observed both for electrons and holes in amorphous boron. The activation energy for electrons and holes were estimated to be about 20 and 85 meV, respectively. The average hopping distance of holes was evaluated from the electric field dependence of the photocurrent to be 11 A s . These activation energies and hopping distances are small compared with those of other amorphous semiconductors. The results suggest that the excited carriers propagate by hopping between localized states within a certain narrow band.

📜 SIMILAR VOLUMES

Modulated Photocurrent Measurements on P
Modulated Photocurrent Measurements on Pure and V-Doped β-Rhombohedral Boron
✍ Yoshiko Sakairi; Masatoshi Takeda; Hirohumi Matsuda; Kaoru Kimura; Keiichi Edaga 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 154 KB

The modulated photocurrent method has been applied to pure and vanadium (V)-doped -rhombohedral boron ( -B) with the goal of investigating the di4erence in the distribution of electronic states in the band gap between them. Excitation light intensity dependence of the amplitude and phase shift of ph

Electron Energy-Loss Spectroscopy Study
Electron Energy-Loss Spectroscopy Study of the Electronic Structure of Li- and V-Dopedβ-Rhombohedral Boron
✍ Masami Terauchi; Yosuke Kawamata; Michiyoshi Tanaka; Hirofumi Matsuda; Kaoru Kim 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 224 KB

Electron energy-loss spectra of Li-and V-doped -rhombohedral boron ( -r-B) were measured from perfect crystalline areas of 180 nm in diameter. The onset of spectra of Li-doped -r-B was observed at about 1.5 eV, but that of V-doped -r-B was not clearly observed. The volume plasmon peaks of Li-and V-d

ChemInform Abstract: Studies on the Asym
ChemInform Abstract: Studies on the Asymmetric Reduction of β-Oximino Methyl Ether Boronates: Reagent Control, Double Diastereocontrol and Transmitted Remote Asymmetric Induction.
✍ Helen E. Sailes; John P. Watts; Andrew Whiting 📂 Article 📅 2001 🏛 John Wiley and Sons ⚖ 42 KB 👁 1 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

Studies on the structure of the complex
Studies on the structure of the complex of the boron neutron capture therapy drug, L-p-boronophenylalanine, with fructose and related carbohydrates: Chemical and 13C NMR evidence for the β-D-fructofuranose 2,3,6-(p-phenylalanylorthoboronate) structure
✍ Brian K. Shull; David E. Spielvogel; Gerald Head; Ramesh Gopalaswamy; Sabapathy 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 214 KB 👁 2 views

The complex of L-p-boronophenylalanine (L-p-BPA) with fructose has been used for the past 5 years in clinical trials of boron neutron capture therapy to treat both melanoma and glioblastoma multiforme. However, the structure of this complex in water buffered at physiologic pH has not been establishe