Details

Autor(en) / Beteiligte

• Wallentin, Jesper
• Anttu, Nicklas
• Asoli, Damir
• Huffman, Maria
• Åberg, Ingvar
• Magnusson, Martin H.
• Siefer, Gerald
• Fuss-Kailuweit, Peter
• Dimroth, Frank
• Witzigmann, Bernd
• Xu, H. Q.
• Samuelson, Lars
• Deppert, Knut
• Borgström, Magnus T.

Titel

InP Nanowire Array Solar Cells Achieving 13.8% Efficiency by Exceeding the Ray Optics Limit

Ist Teil von

• Science (American Association for the Advancement of Science), 2013-03, Vol.339 (6123), p.1057-1060

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2013

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• Photovoltaics based on nanowire arrays could reduce cost and materials consumption compared with planar devices but have exhibited low efficiency of light absorption and carrier collection. We fabricated a variety of millimeter-sized arrays of p-type/intrinsic/n-type (p-i-n) doped InP nanowires and found that the nanowire diameter and the length of the top n-segment were critical for cell performance. Efficiencies up to 13.8% (comparable to the record planar InP cell) were achieved by using resonant light trapping in 180-nanometer-diameter nanowires that only covered 12% of the surface. The share of sunlight converted into photocurrent (71%) was six times the limit in a simple ray optics description. Furthermore, the highest open-circuit voltage of 0.906 volt exceeds that of its planar counterpart, despite about 30 times higher surface-to-volume ratio of the nanowire cell.