Journal
NANO LETTERS
Volume 15, Issue 3, Pages 1809-1814Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504559g
Keywords
Nanowire; absorption; solar cell; photovoltaics; core-shell; radial; InP
Categories
Funding
- Nordic innovation program NANORDSUN
- Swedish Research Council (VR)
- Swedish Foundation for Strategic Research (SSF)
- Swedish Energy Agency
- Nanometer Structure Consortium at Lund University (nmC@LU)
- Knut and Alice Wallenberg Foundation
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We have compared the absorption in InP coreshell nanowire pin junctions in lateral and vertical orientation. Arrays of vertical coreshell nanowires with 400 nm pitch and 280 nm diameter, as well as corresponding lateral single coreshell nanowires, were configured as photovoltaic devices. The photovoltaic characteristics of the samples, measured under 1 sun illumination, showed a higher absorption in lateral single nanowires compared to that in individual vertical nanowires, arranged in arrays with 400 nm pitch. Electromagnetic modeling of the structures confirmed the experimental observations and showed that the absorption in a vertical nanowire in an array depends strongly on the array pitch. The modeling demonstrated that, depending on the array pitch, absorption in a vertical nanowire can be lower or higher than that in a lateral nanowire with equal absorption predicted at a pitch of 510 nm for our nanowire geometry. The technology described in this Letter facilitates quantitative comparison of absorption in laterally and vertically oriented coreshell nanowire pin junctions and can aid in the design, optimization, and performance evaluation of nanowire-based coreshell photovoltaic devices.
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