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(3-Phenylpyridin-1-ium)SbI4: Coulomb Interaction-Assembled Lead-free Hybrid Perovskite-like Semiconductor

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journal contribution
posted on 06.01.2020, 23:29 by Ruo-Yu Zhao, Guang-Ning Liu, Qi-Sheng Liu, Peng-Fei Niu, Rang-Dong Xu, Zi-Han Wang, Tian-Hui Wei, Jie Zhang, Yi-Qiang Sun, Cuncheng Li
The environmental toxicity of Pb in inorganic–organic hybrid perovskite presents a major hurdle to commercialization, which has triggered intense research on exploring Pb-free alternatives. Soft interaction, especially Coulomb interaction not only enriching the synthesis strategy but endowing a unique property to the derived materials, is appealing for constructing Pb-free alternatives; however, less has been reported. We herein demonstrate the construction of a Sb-based hybrid perovskite-like semiconductor (3-phenylpyridin-1-ium)­SbI4 (denoted as 3ppi-SbI4) via the “Coulomb interaction strategy”. Therein, the zigza (SbI4) chains interact with the 3ppi countercations through Coulomb interaction only in the crystal lattice. It has good moisture, sunlight, and UV light stabilities. Further, 3ppi-SbI4 exhibits excellent light absorption, direct band gap feature, good photoconduction, and excellent repeatability of photocurrent, which all imply its potential as a Pb-free, light-absorbing candidate for optoelectronic application. Theoretical calculations disclose that the photoresponse is mainly ascribed to the electron transitions within (SbI4) chains, as well as between inorganic and organic moieties.