title: Fabrication of Efficient Formamidinium Tin Iodide Perovskite Solar Cells through SnF₂-Pyrazine Complex.
abstract: To fabricate efficient formamidinium tin iodide (FASnI3) perovskite solar cells (PSCs), it is essential to deposit uniform and dense perovskite layers and reduce Sn(4+) content. Here we used solvent-engineering and nonsolvent dripping process with SnF2 as an inhibitor of Sn(4+). However, excess SnF2 induces phase separation on the surface of the perovskite film. In this work, we report the homogeneous dispersion of SnF2 via the formation of the SnF2-pyrazine complex. Consequently, we fabricated FASnI3 PSCs with high reproducibility, achieving a high power conversion efficiency of 4.8%. Furthermore, the encapsulated device showed a stable performance for over 100 days, maintaining 98% of its initial efficiency.
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.
authors.forename: Seon Joo
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.|School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea.
authors.forename: Seong Sik
authors.initials: SS
authors.lastname: Shin
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.
authors.forename: Young Chan
authors.initials: YC
authors.lastname: Kim
authors.affiliation: Department of Energy Science, Sungkyunkwan University , 2066 Seobu-Ro, Jangsan-Gu, Suwon 440-746, Republic of Korea.
authors.forename: Dasom
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Energy Science, Sungkyunkwan University , 2066 Seobu-Ro, Jangsan-Gu, Suwon 440-746, Republic of Korea.
authors.forename: Tae Kyu
authors.initials: TK
authors.lastname: Ahn
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.
authors.forename: Jun Hong
authors.initials: JH
authors.lastname: Noh
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.
authors.forename: Jangwon
authors.initials: J
authors.lastname: Seo
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology , 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Republic of Korea.|School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea.
authors.forename: Sang Il
authors.initials: SI
authors.lastname: Seok