Co-Cation Engineering via Mixing of Acetamidinium and Rubidium in FASnI for Tin Perovskite Solar Cells to Attain 14.5% Efficiency.

Tin perovskite solar cells (TPSCs) were developed by adding the co-cations acetamidinium (AC) and rubidium (Rb) in varied proportions based on the FASnI structure (E1). We found that adding 10% AC and 3% Rb can optimize the device (E1AC10Rb3) to attain an efficiency of power conversion of 14.5% with great shelf- and light-soaking stability.

Ternary Chalcogenides GeSbSe and GeSbSe Containing a [SbSe] 1D Chain and a 2D Structure Related to SnSe.

Ternary chalcogenides, GeSbSe and GeSbSe, were synthesized and characterized. These chalcogenides are the first ternary selenides in a ternary Ge-Sb-Se system that feature a layer structure related to black phosphorus and SnSe-type structures. Both compounds contain a [SbSe] unit with Sb cations in a zigzag Sb-Sb chain structure, and Sb cations in a distorted NaCl-type of [GeSbSe] unit ( = 4, 5).