VNU Journal of Science Mathematics – Physics, Vol 37, No 2 (2021) 69 76 69 Original Article Fabrication of Highly Efficient Pervoskite Solar Cells Using Simple Single step Solution Method Quang Duy Dao* VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam Received 16 June 2020 Revised 18 August 2020; Accepted 05 September 2020 Abstract This article presents optical property, crystal structure, and photovoltaic performance of perovskite solar cell (PSC) in n i p structure usin[.]