High-efficiency AlGaInP solar cells grown by molecular beam epitaxy

Faucher, J.; Sun, Y.; Jung, D.; Martin, D.; Masuda, T.; Lee, M. L.

doi:10.1063/1.4965979

High-efficiency AlGaInP solar cells grown by molecular beam epitaxy

Journal Article · Thu Oct 27 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4965979· OSTI ID:1420539

Faucher, J.; Sun, Y.; ; Martin, D.; ; Lee, M. L.

AlGaInP is an ideal material for ultra-high efficiency, lattice-matched multi-junction solar cells grown by molecular beam epitaxy (MBE) because it can be grown lattice-matched to GaAs with a wide 1.9–2.2 eV bandgap. Despite this potential, AlGaInP grown by molecular beam epitaxy (MBE) has yet to be fully explored, with the initial 2.0 eV devices suffering from poor performance due to low minority carrier diffusion lengths in both the emitter and base regions of the solar cell. In this work, we show that implementing an AlGaInP graded layer to introduce a drift field near the front surface of the device enabled greatly improved internal quantum efficiency (IQE) across all wavelengths. In addition, optimizing growth conditions and post-growth annealing improved the long-wavelength IQE and the open-circuit voltage of the cells, corresponding to a 3× increase in diffusion length in the base. Taken together, this work demonstrates greatly improved IQE, attaining peak values of 95%, combined with an uncoated AM1.5G efficiency of 10.9%, double that of previously reported MBE-grown devices.

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000508

OSTI ID:: 1420539

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 17 Vol. 109; ISSN 0003-6951

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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