Pham, Phuong, Trung Tran, and Khoa Pham. 2015. “Improverment of Electrical and Optical Properties of Doped Amorphous Silicon Layers Applied to Heterojunction Solar Cells”. Science and Technology Development Journal 18 (3), 55-60. https://doi.org/https://doi.org/10.32508/stdj.v18i3.820.