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Effect of the Uniaxial Compression on the GaAs Nanowire Solar Cell

1
Ioffe Institute, 194021 Saint-Petersburg, Russia
2
Alferov University, 194021 Saint-Petersburg, Russia
3
ITMO University, 197101 Saint-Petersburg, Russia
4
Saint Petersburg Electrotechnical University “LETI”, 197376 Saint-Petersburg, Russia
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(6), 581; https://doi.org/10.3390/mi11060581
Received: 27 April 2020 / Revised: 5 June 2020 / Accepted: 8 June 2020 / Published: 10 June 2020
(This article belongs to the Section A:Physics)
Research regarding ways to increase solar cell efficiency is in high demand. Mechanical deformation of a nanowire (NW) solar cell can improve its efficiency. Here, the effect of uniaxial compression on GaAs nanowire solar cells was studied via conductive atomic force microscopy (C-AFM) supported by numerical simulation. C-AFM I–V curves were measured for wurtzite p-GaAs NW grown on p-Si substrate. Numerical simulations were performed considering piezoresistance and piezoelectric effects. Solar cell efficiency reduction of 50% under a −0.5% strain was observed. The analysis demonstrated the presence of an additional fixed electrical charge at the NW/substrate interface, which was induced due to mismatch between the crystal lattices, thereby affecting the efficiency. Additionally, numerical simulations regarding the p-n GaAs NW solar cell under uniaxial compression were performed, showing that solar efficiency could be controlled by mechanical deformation and configuration of the wurtzite and zinc blende p-n segments in the NW. The relative solar efficiency was shown to be increased by 6.3% under −0.75% uniaxial compression. These findings demonstrate a way to increase efficiency of GaAs NW-based solar cells via uniaxial mechanical compression. View Full-Text
Keywords: GaAs; gallium arsenide; nanowire; solar cell; piezoelectric; polarization; piezophototronic; piezoresistance; zinc blende; wurtzite GaAs; gallium arsenide; nanowire; solar cell; piezoelectric; polarization; piezophototronic; piezoresistance; zinc blende; wurtzite
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MDPI and ACS Style

Alekseev, P.A.; Sharov, V.A.; Borodin, B.R.; Dunaevskiy, M.S.; Reznik, R.R.; Cirlin, G.E. Effect of the Uniaxial Compression on the GaAs Nanowire Solar Cell. Micromachines 2020, 11, 581.

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