Work

Spectrally Resolved Interband and Intraband Transitions by Two-Step Photon Absorption in InGaAs/GaAs Quantum Dot Solar Cells

Year: 2014

Type: article

Abstract: Two-step photon absorption processes in a self-organized In0.4Ga0.6As/GaAs quantum dot solar cell have been investigated by means of infrared (IR) light-biased change in external quantum efficiency (ΔEQE) spectroscopy at 9 K. In this paper, not only interband transitions but intraband transitions were both spectrally resolved by utilizing wavelength tunable intense mid-IR pulsed laser as the IR bias light source. The obtained EQE enhancement was attributed from reexcitation of photocarriers captured by quantum dots. The bound-to-continuum intraband transition probability was estimated to be about 8% by irradiating 100-suns-equivalent IR bias light.

Source: IEEE Journal of Photovoltaics

DOI: 10.1109/jphotov.2014.2368712

Authors: Ryo Tamaki, Yasushi Shoji, Yoshitaka Okada, Kenjiro Miyano

Institutions: Research Center for Advanced Science and Technology, The University of Tokyo, The University of Tokyo

Language: English

Topic: Semiconductor Quantum Structures and Devices

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funders: Ministry of Economy, Trade and Industry, New Energy and Industrial Technology Development Organization, Japan Society for the Promotion of Science