College of Science and Engineering;
Ritsumeikan University 1-1-1 Nojihigashi;
Kusatsu;
Shiga 525-8577;
Japan;
Clean Venture 21 Co. Ltd.;
35 Kamitoba Daimotsu-chou Minami-ku;
Kyoto 601-8121;
Japan;
solar; cell; sphere; silicon; undercooling; low; pressure; thermal; history; etch; pit;