Nishikubo, RyosukeKanda, HiroyukiGarcia-Benito, InesMolina-Ontoria, AgustinPozzi, GianlucaAsiri, Abdullah M.Nazeeruddin, Mohammad KhajaSaeki, Akinori2021-06-082021-06-082021-06-082020-08-1110.1021/acs.chemmater.0c01503https://infoscience.epfl.ch/handle/20.500.14299/178752WOS:000562136900016Bismuth- and antimony-based materials, such as A(3)M(2)X(9) and AMSX(2) (A = cation, M = Bi, Sb, S = sulfur, X = halogen), are promising candidates as the counterpart to lead halide perovskite. However, the large number of different compositions and crystal structures (dimer, perovskite, etc.) has made these materials largely overlooked; thus, an intuitive evaluation strategy is required. Here, we present a comprehensive study of the energy levels (bandgap, valence band maximum, etc.) and optoelectronics (photoconductivity and charge transfer to charge transport material) of the Bi - and Sb-based materials, which include 6 crystal categories with 44 compositions, by using time-resolved microwave conductivity (TRMC). Importantly, we found an efficient hole transfer from the Sb-based materials to the hole transport materials with the inclusion of the thiophene component, leading to an improved power conversion efficiency of 2.91% for Sb2S3-containing SbSI, prepared by a novel one-step method. Our study establishes a key rule for exploring active layer compositions and designing device structures, which would accelerate the evolution of Bi- and Sb-based lead-free solar cells.text::journal::journal article::research article