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title = {{Patterned Radial {GaAs} Nanopillar Solar Cells}},  journal = {Nano Letters},  }  @article{Nakai_2013,  doi = {10.7567/jjap.52.055002},  url = {http://dx.doi.org/10.7567/jjap.52.055002},  year = {2013},  month = {may},  publisher = {{IOP} Publishing},  volume = {52},  number = {5R},  pages = {055002},  author = {Eiji Nakai and Masatoshi Yoshimura and Katsuhiro Tomioka and Takashi Fukui},  title = {{{GaAs}/{InGaP} Core{\textendash}Multishell Nanowire-Array-Based Solar Cells}},  journal = {Japanese Journal of Applied Physics},  }