Lead-free Perovskite Materials (NH4)(3)Sb2IxBr9-x

摘要

A family of perovskite light absorbers (NH4)(3)Sb2IxBr9-x (0 <= x <= 9) was prepared. These materials show good solubility in ethanol, a low-cost, hypotoxic, and environmentally friendly solvent. The light absorption of (NH4)(3)Sb2IxBr9-x films can be tuned by adjusting I and Br content. The absorption onset for (NH4)(3)Sb2IxBr9-x films changes from 558 nm to 453 nm as x changes from 9 to 0. (NH4)(3)Sb2I9 single crystals were prepared, exhibiting a hole mobility of 4.8 cm(2)V(-1)s(-1) and an electron mobility of 12.3 cm(2)V(-1)s(-1) . (NH4)(3)Sb2I9 solar cells gave an open-circuit voltage of 1.03 Vand a power conversion efficiency of 0.51%.