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- 1. Phys. Rev. Lett. 98, 026802 (2007) , “Microscopic Basis for the Mechanism of Carrier Dynamics in an Operating p-n Junction Examined by Using Light-Modulated Scanning Tunneling Spectroscopy”, Shoji Yoshida, Yuya Kanitani, Ryuji Oshima, Yoshitaka Okada, Osamu Takeuchi, and Hidemi ShigekawaThe doping characteristics and carrier transport in a GaAs p-n junction were visualized with a ~10 nm spatial resolution, using light-modulated scanning tunneling spectroscopy. The dynamics of minority carriers under operating conditions, such as recombination, diffusion, and electric... (Read more)
- 2. J. Appl. Phys. 100, 063706 (2006) , “Effect of dislocations on minority carrier diffusion length in practical silicon solar cells”, Thomas Kieliba, Stephan Riepe, and Wilhelm WartaIn 1998, Donolato presented an analytical model describing the effect of dislocation density on minority carrier effective diffusion length [J. Appl. Phys. 84, 2656 (1998)]. While this analysis was derived for a "semi-infinite" specimen, our objective is the appropriate description... (Read more)
- 3. J. Appl. Phys. 100, 013501 (2006) , “Contactless electromodulation spectroscopy of AlGaN/GaN heterostructures with a two-dimensional electron gas: A comparison of photoreflectance and contactless electroreflectance”, R. Kudrawiec, M. Syperek, M. Motyka, J. Misiewicz, R. Paszkiewicz, B. Paszkiewicz, M. T?acza?aPhotoreflectance (PR) and contactless electroreflectance (CER) spectroscopies have been applied to study optical transitions in undoped and Si-doped AlGaN/GaN heterostructures at room temperature. Spectral features related to excitonic and band-to-band absorptions in GaN layer and band-to-band... (Read more)
- 4. Phys. Rev. Lett. 97, 256603 (2006) , “Spatial Extent of Wave Functions of Gate-Induced Hole Carriers in Pentacene Field-Effect Devices as Investigated by Electron Spin Resonance”, Kazuhiro Marumoto, Shin-ichi Kuroda, Taishi Takenobu,, and Yoshihiro IwasaAn electron spin resonance (ESR) method is applied to a pentacene field-effect device to investigate gate-induced hole carriers in such devices. Clear field-induced ESR signals are observed, demonstrating that all of the field-injected carriers have S=1/2 spins. Anisotropic ESR signals due to... (Read more)
- 5. Phys. Rev. Lett. 97, 066602 (2006) , “Electrically Detected Electron Spin Resonance in a High-Mobility Silicon Quantum Well”, Junya Matsunami, Mitsuaki Ooya, and Tohru OkamotoThe resistivity change due to electron spin resonance (ESR) absorption is investigated in a high-mobility two-dimensional electron system formed in a Si/SiGe heterostructure. Results for a specific Landau level configuration demonstrate that the primary cause of the ESR signal is a reduction of the... (Read more)
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