Ultrasonication-modified electrochemically exfoliated graphene for counter electrode in dye-sensitized solar cells oleh Nenden Fauziah, Nadiatus Silmi, Fairuz Gianirfan Nugroho, Kemal Lesmana Hidayat Putra, Didi Prasetyo Benu, Fry Voni Steky, Risa Rahmawati Sunarya, Brian Yuliarto, Rahmat Hidayat, Veinardi Suendo