Optical Absorption Enhancement in Amorphous Silicon Nanowire and Nanocone Arrays Zhu, Jia ; Yu, Zongfu ; Burkhard, George F. ; Hsu, Ching-Mei ; Connor, Stephen T. ; Xu, Yueqin ; Wang, Qi ; McGehee, Michael ; Fan, Shanhui ; Cui, Yi Abstract Publication: Nano Letters Pub Date: January 2009 DOI: 10.1021/nl802886y Bibcode: 2009NanoL...9..279Z