Lead-Halide Perovskite Solar Cells by CH3NH3I Dripping on PbI2-CH3NH3I-DMSO Precursor Layer for Planar and Porous Structures Using CuSCN Hole-Transporting Material.
The sequential fabrication scheme of the CH3NH3PbI3 layer has been improved to fabricate planar-structure CH3NH3PbI3 perovskite solar cells using CuSCN hole-transporting material (HTM). In the PbI2 layer fabricated by the spin-coating method, at first, small amounts of CH3NH3I (MAI) and DMSO were incorporated as the first-drip precursor layer on a flat TiO2 layer. On the first-drip precursor layers, an MAI solution was applied by either soaking (MAI-soaking method) or dripping using successive spin coating (MAI-dripping). The morphology and crystal transformations were observed by SEM and XRD, respectively. Using the normal sequential MAI-soaking method, we were unable to fabricate planar CH3NH3PbI3 perovskite solar cells with CuSCN HTM. Using the MAI-dripping method, however, a significant photovoltaic effect has been observed to be planar <TiO2/CH3NH3PbI3 perovskite/CuSCN> solar cells.
†Department of Electric Engineering and Computer Science, School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hypogo 671-2280, Japan.
Seigo
S
Ito
†Department of Electric Engineering and Computer Science, School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hypogo 671-2280, Japan.
Soichiro
S
Tanaka
‡Energy Technology Laboratories, Osaka Gas Co., Ltd., 6-19-9 Konohana-Ku, Osaka 554-0051, Japan.
Hitoshi
H
Nishino
copper thiocyanate; flat TiO2; interdiffusion; mesoporous titania