Presentation Information
[We-P-74]Energy-state Configuration of Er3+ in GaAs Enabling Photon Ratchet Intermediate-band Solar Cells
〇Yuka Kitano1, Kota Toda1, Shigeo Asahi1, Yukihiro Harada1, Yusuke Oteki2, Myeongok Kim2, Yuya Makino3, Tatsuki Kawamura3, Tomah Sogabe3, Yoshitaka Okada2, Takashi Kita1 (1. Kobe univ. (Japan), 2. The Univ. of Tokyo (Japan), 3. The Univ. of Electro-Communications (Japan))
GaAs:Er is investigated as a photon-ratchet intermediate-band solar cell material using photoluminescence and excitation spectroscopy, revealing long-lived Er 4f states, thermally activated quenching processes, and energy alignment consistent with a ratchet band enabling efficient carrier accumulation.