Organic–inorganic hybrid perovskites (most notably CH₃NH₃PbI₃) have recently been demonstrated as high-performance and low cost hybrid materials for photovoltaic application because of their prominent light-absorbing capacity and excellent optoelectronic properties. However, some serious concerns, including the potential toxicity of lead and chemical/phase instability of such hybrid perovskites, have become bottlenecks for their commercialization. In this study, through utilizing an alternative trivalent cation Sb³⁺ with the ns²np⁰ electronic configuration, we designed a new lead-free hybrid material, [tert-butylammonium]₄[Sb₄I₁₆]·2H₂O (1), which adopts a zero-dimensional architecture consisting of corner-sharing SbI₆ octahedra. It is noteworthy that 1 shows evident light-absorbance with a narrow optical bandgap of ∼2.06 eV, along with positive temperature-dependent conductivity and notable photo-conductive response. Moreover, 1 displays phase stability under ambient conditions, which is superior to that of CH₃NH₃PbI₃. The obtained results suggest the potential of 1 as a light absorbing material for photovoltaic applications.

中文翻译：

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一种新型的基于锑的有机-无机杂化吸收剂，具有光导响应†

有机-无机杂化钙钛矿（最著名的是CH ₃ NH ₃ PbI ₃）由于其突出的光吸收能力和出色的光电性能，最近被证明是用于光伏应用的高性能和低成本杂化材料。但是，一些严重的问题，包括铅的潜在毒性和此类杂化钙钛矿的化学/相不稳定性，已成为其商业化的瓶颈。在这项研究中，通过使用具有ns ² np ⁰电子构型的替代三价阳离子Sb ³⁺，我们设计了一种新的无铅杂化材料[叔丁基铵] ₄ [Sb₄ I ₁₆ ]·2H ₂ O（ 1），其采用由角共享SbI ₆八面体组成的零维架构。值得注意的是，图1显示了明显的吸光度，具有约2.06 eV的窄光学带隙，以及正温度相关的电导率和显着的光电导响应。此外， 1在环境条件下显示出相稳定性，其优于CH ₃ NH ₃ PbI ₃。获得的结果表明1作为光电应用的光吸收材料的潜力。