2015/07/27 by Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii +7
Engineering · Physics and Astronomy · #Carrier lifetime #Electron mobility #Photoluminescence #Quantum #Quantum dot #Quantum well #SIGNAL (programming language) #Semiconductor Quantum Structures and Devices #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.app-ph #solar cell performance optimization
paper · pdf · doi:10.1063/1.4927612
published as Applied Physics Letters 107, 043901 (2015)
openalex publication_date 2015/07/27 · openalex created_date 2016/06/24 · arxiv created 2020/05/30 · arxiv updated 2020/06/02 · openalex updated_date 2026/08/05
In this study, we propose a carrier time-of-flight technique to evaluate the carrier transport time across a quantum structure in an active region of solar cells. By observing the time-resolved photoluminescence signal with a quantum-well probe inserted under the quantum structure at forward bias, the carrier transport time can be efficiently determined at room temperature. The averaged drift velocity shows linear dependence on the internal field, allowing us to estimate the quantum structure as a quasi-bulk material with low effective mobility containing the information of carrier dynamics. We show that this direct and real-time observation is more sensitive to carrier transport than other conventional techniques, providing better insights into microscopic carrier transport dynamics to overcome a device design difficulty.