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

Author:

Wallentin Jesper1,Anttu Nicklas1,Asoli Damir2,Huffman Maria2,Åberg Ingvar2,Magnusson Martin H.2,Siefer Gerald3,Fuss-Kailuweit Peter3,Dimroth Frank3,Witzigmann Bernd4,Xu H. Q.15,Samuelson Lars1,Deppert Knut1,Borgström Magnus T.1

Affiliation:

1. Solid State Physics, Lund University, Box 118, 22100 Lund, Sweden.

2. Sol Voltaics AB, Ideon Science Park, Scheelevägen 17, 22370 Lund, Sweden.

3. Fraunhofer ISE, Heidenhofstrasse 2, D-79110 Freiburg, Germany.

4. University of Kassel, Wilhelmshoeher Allee 71, 34121, Kassel, Germany.

5. Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China.

Abstract

Improving Nanowire Photovoltaics In principle, solar cells based on arrays of nanowires made from compound inorganic semiconductors, such as indium phosphide (InP), should decrease materials and fabrication costs compared with planar junctions. In practice, device efficiencies tend to be low because of poor light absorption and increased rates of unproductive charge recombination in the surface region. Wallentin et al. (p. 1057 , published online 17 January) now report that arrays of p-i-n InP nanowires (that switch from positive to negative doping), grown to millimeter lengths, can be optimized by varying the nanowire diameter and length of the n-doped segment. Efficiencies as high as 13.8% were achieved, which are comparable to the best planar InP photovoltaics.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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