Improved Polarization in the Sr6 Cd2 Sb6 O7 Se10 Oxyselenide through Design of Lateral Sublattices for Efficient Photoelectric Conversion

Ruiqi Wang; Fakun Wang; Xian Zhang; Xin Feng; Chendong Zhao; Kejun Bu; Zhuang Zhang; Tianyou Zhai; Fuqiang Huang

doi:10.1002/anie.202206816

Improved Polarization in the Sr₆ Cd₂ Sb₆ O₇ Se₁₀ Oxyselenide through Design of Lateral Sublattices for Efficient Photoelectric Conversion

Angew Chem Int Ed Engl. 2022 Aug 15;61(33):e202206816. doi: 10.1002/anie.202206816. Epub 2022 Jul 8.

Authors

Ruiqi Wang¹, Fakun Wang², Xian Zhang³, Xin Feng², Chendong Zhao⁴, Kejun Bu⁵, Zhuang Zhang⁴, Tianyou Zhai², Fuqiang Huang^{1

4}

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
² State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan, 430074, P. R. China.
³ Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing, 100094, P. R. China.
⁴ State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
⁵ Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, P. R. China.

PMID: 35715388
DOI: 10.1002/anie.202206816

Abstract

Highly-polarizable materials are favorable for photoelectric conversion due to their efficient charge separation, while precise design of them is still a big challenge. Herein a novel polar oxyselenide, Sr₆ Cd₂ Sb₆ O₇ Se₁₀ , is rationally designed. It contains lateral sublattices of polarizable [Sb₂ OSe₄ ]^4- chains and highly-orientated [CdSe₃ ]^4- chains. The intense polarization was evaluated by significant second-harmonic generation (SHG) signal (maximum: 12.6×AgGaS₂ ) in broad spectrum range. The polarization was found to mainly improve the carrier separation with a much longer recombination lifetime (76.5 μs) than that of the nonpolar compound Sr₂ Sb₂ O₂ Se₃ (18.0 μs), resulting in better photoelectric performance. The single-crystal photoelectric device exhibited excellent response covering broad spectrum in 500-1000 nm with stable reproducibility. This work provides some new insights into the structure design of highly-polarizable heteroanionic materials for photoelectric conversion.

Keywords: Heteroanionic Compounds; Photoelectric Conversion; Polarization; Second-Harmonic Generation.

Abstract

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