Improved photovoltaic effects in InGaN-based multiple quantum well solar cell with graphene on indium tin oxide nanodot nodes for transparent and current spreading electrode Hoon Seo, Tae and Shim, Jae-Phil and Jin Chae, Seung and Shin, GangU and Kyoung Kim, Bo and Lee, Dong-Seon and Hee Lee, Young and Suh, Eun-Kyung, Applied Physics Letters, 102, 031116 (2013), DOI: