Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Jin-Won Chung and Jun Woong Park and Yu Jin Lee,Graded Layer Modification for High Efficiency Hydrogenated Amorphous Silicon-Germanium Solar Cells,Japanese journal of applied physics : JJAP,00214922,Tokyo : The Japan Society of Applied Physics,2012-10,51,10,,https://cir.nii.ac.jp/crid/1520572358043613824,