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Proceedings Paper

Effect of tapered shape on performance of silicon nanowire solar cells
Author(s): Yasuyoshi Kurokawa; Shinya Kato; Makoto Konagai
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Paper Abstract

The effect of tapered shape on electrical properties of heterojunction silicon nanowire (SiNW) solar cells was simulated with a two-dimensional quantum device simulator. When the quantum effect was taken in account, opencircuit voltage (Voc) and fill factor (FF) of heterojunction SiNW solar cells were drastically improved from 390 to 862 mV and from 0.662 to 0.795, respectively. This is due to the bandgap widening and the enhancement of electric field in the intrinsic SiNW. When a top side diameter (d1) of the SiNW was set at 2 nm and a bottom side diameter (d2) was varied from 2 to 6 nm, short-circuit current density (Jsc) was drastically increased from 6.96 to 30.8 mA/cm2. The main reason is the absorption enhancement due to a tapered shape with a graded refractive index. Ultimately, conversion efficiency was monotonically increased with increasing d2 in the range from 2 to 6 nm. The quantum size effect and the tapered shape can enhance conversion efficiency of heterojunction SiNW solar cells.

Paper Details

Date Published: 7 October 2014
PDF: 6 pages
Proc. SPIE 9178, Next Generation Technologies for Solar Energy Conversion V, 91780N (7 October 2014); doi: 10.1117/12.2061291
Show Author Affiliations
Yasuyoshi Kurokawa, Tokyo Institute of Technology (Japan)
Japan Science and Technology Agency (Japan)
Shinya Kato, Japan Science and Technology Agency (Japan)
Makoto Konagai, Tokyo Institute of Technology (Japan)
Japan Science and Technology Agency (Japan)

Published in SPIE Proceedings Vol. 9178:
Next Generation Technologies for Solar Energy Conversion V
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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