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Proceedings Paper

Exploring the potential of quantum wells for efficiency enhancement in photovoltaic cells
Author(s): Masakazu Sugiyama; Yunpeng Wang; Hiromasa Fujii; Hassanet Sodabanlu; Yu Wen; Kentaroh Watanabe; Yoshiaki Nakano
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Paper Abstract

A quantum-well suparlattice cell, in which In0.13Ga0.86As (4.7 nm) / GaAs0.57P0.43 (3.1 nm) strain-balanced quantum wells are inserted in the intrinsic region of a GaAs pin cell, has been implemented by metalorganic vapor-phase epitaxy (MOVPE) and has exhibited an enhanced short-circuit current density, with an increment of 3.0 mA/cm2 and a minimal drop in open-circuit voltage (0.03 V) compared to a pin cell without the superlattice. The collection efficiency of photocarriers, which are generated in a cell upon the irradiation of monochromatic light, to an external circuit has been evaluated for both the superlattice cell and a conventional quantum-well cell with thicker wells and barriers. This carrier collection efficiency is was above 0.95 for the superlattice cell, regardless of a wavelength and an external bias, while the value for the quantum-well cell degraded to be below 0.8 at a large forward bias, which evidenced superior carrier transport with the help of tunneling through the thin barriers. With such a fast electron-hole separation in the superlattice, photo-current generation by two-step photon absorption has been observed, using the electron ground state of the superlattice as an intermediate band.

Paper Details

Date Published: 21 February 2012
PDF: 8 pages
Proc. SPIE 8256, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices, 82560D (21 February 2012); doi: 10.1117/12.911078
Show Author Affiliations
Masakazu Sugiyama, The Univ. of Tokyo (Japan)
Yunpeng Wang, The Univ. of Tokyo (Japan)
Hiromasa Fujii, The Univ. of Tokyo (Japan)
Hassanet Sodabanlu, The Univ. of Tokyo (Japan)
Yu Wen, The Univ. of Tokyo (Japan)
Kentaroh Watanabe, The Univ. of Tokyo (Japan)
Yoshiaki Nakano, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 8256:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices
Alexandre Freundlich; Jean-Francois F. Guillemoles, Editor(s)

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