李木清题为"Structure Tunable Organic-Inorganic Bismuth Halides for an Enhanced Two-Dimensional Lead-Free Light-Harvesting Material"的论文被Chemistry of Materials接收。

Abstract: Bismuth-based hybrid materials are recently attempted as lead-free alternatives for CH3NH3PbI3 in solar cell applications, but the power conversion efficiencies of such cells remain low, for which the discontinuous connectivity of the inorganic components can be an important reason. To confirm such a hypothesis we synthesized a series of organic-inorganic bismuth halides with distinct structure-property correlation. The isolated compounds formulated as (TMP)[BiI₅]1, (TMP)[BiBr₅] 2, (TMP)[BiCl₅] 3 and (TMP)_1.5[Bi₂I₇Cl₂] 4 (TMP = N,N,N’,N’-Tetramethylpiperazine) show one-dimensional bismuth-halide connectivity for pure halide compounds (1-3); while two-dimensional bismuth-halide connectivity for the mixed-halogen compound 4. The optical band gaps of these four compounds, which are ranging from 2.02 eV to 3.21 eV, roughly correspond to the halogens species and dimensionality of the inorganic moieties. Though compound 4 shows the second narrowest optical band gap (2.10 eV) it shows the highest electrical conductivity of 2.37×10–6 S/cm in this series of compounds. Moreover, a simple device using 4 as light absorber shows efficient photoconductivity response and very high stability either in humid air or under long-time irradiation, indicating a potential light-harvesting material.

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