3 papers
physics.optics2025
Enhanced intraband absorption in two-step photon upconversion solar cells with a double-tunnel-junction structure
Koichiro Matsuzawa, Shigeo Asahi, Takashi Kita
Two-step photon upconversion solar cells (TPU-SCs) belong to the class of solar cells that in principle can exceed the Shockley--Queisser limit for single-junction solar cells. A T…
physics.optics2024
Conduction band resonant states absorption for quantum dot infrared detectors operating at room temperature
Stefano Vichi, Shigeo Asahi, Sergio Bietti +4
Long Wavelenght infrared devices, despite growing interest due to a wide range of applications in commercial, public, and academic sectors, are still struggling to achieve signific…
cond-mat.mes-hall2016
Spatially resolved electronic structure of an isovalent nitrogen center in GaAs
R. C. Plantenga, V. R. Kortan, T. Kaizu +4
Small numbers of nitrogen dopants dramatically modify the electronic properties of GaAs, generating very large shifts in the conduction-band energies with nonlinear concentration d…