抄録
Offer Organization: Japan Society for the Promotion of Science, System Name: Grants-in-Aid for Scientific Research, Category: Grant-in-Aid for Scientific Research (B), Fund Type: -, Overall Grant Amount: - (direct: 13300000, indirect: 3990000)
The purpose of this research is to propose the way to enhance the efficiency of Pb free perovskite solar cells, namely, Sn PVK solar cells. Focus was put on decreasing defect density of PVK crystals including the grain boundary and the heterointerfaces. In order to make clear the performance of Sn PVK layer, no metal dopant was added in B site of ABX3 structure. We aimed at unveiling items retarding the efficiency-enhancement for the Sn-PVK. We found the following items for the efficiency enhancement. 1. Inverted structures are recommended to avoid the direct contact between Sn-PVK and inorganic oxide semiconductors, 2. To reduce the crystal lattice strain by optimizing the size of A site gives higher efficiency, 3. Grain boundary passivation is effective, 4. Addition of reducing agents, such as Sm ion, are useful because of the decrease in the defect density associated with Sn4+.