Hoang, Thu, Hoa Huynh, Phuong Pham, Hung Nguyen, Giang Le, and Trung Tran. “The Research and Fabrication of Graphene Quantum Dots Applied As the Hole Transporting Layer in Polymer Solar Cells”. Science & Technology Development Journal: Natural Sciences 2, no. 5 (July 2, 2019): 113-121. Accessed April 29, 2024. http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/786.