Engineering of Halide Cation in All-Inorganic Perovskite with Full-Color Luminescence

Cuili Gai,Jigang Wang,Dawei He,Junming Li,Yongsheng Wang

doi:10.3390/coatings11030330

Cuili Gai, Jigang Wang + Show 3 more

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All-inorganic halide perovskites are emerging as a class of superstar semiconductors with excellent optoelectronic properties and show great potential for a broad range of applications in solar cells, lighting diodes, X-ray imaging, and photodetectors. Tremendous research about their device performance has been performed since 2015. In this study, we synthesized the all-inorganic perovskite by the hot-injection method and particularly investigated their crystal structural and photoluminescence properties. By halide anion engineering, the all-inorganic perovskites showed a high-symmetry cubic phase. They also showed a tunable optical bandgap, and almost the full color luminescence was achieved (434 to 624 nm). These basic optoelectronic properties could give a guide for further development of this area.

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Coatings 2021, 11, 330. https://Recently, halide perovskites have been extensively studied due to their fascinating optoelectronic properties, such as tunable bandgaps, high absorption range and coefficients, long minority carrier lifetimes, low-cost fabrication process, flexible device, etc. [1,2]
Halide perovskites have a chemical formula of ABX3, where
With the inorganic Cs cation at A position, CsPbX3 perovskite shows a significantly improve stability, which has already proven in the solid-state dye sensitized solar cells and previous perovskite solar cells (PSCs)

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Introduction

Halide perovskites have been extensively studied due to their fascinating optoelectronic properties, such as tunable bandgaps, high absorption range and coefficients (up to 105 cm−1 ), long minority carrier lifetimes, low-cost fabrication process, flexible device, etc. [1,2]. A wide range of optoelectronic applications have been developed with them as the active layer, e.g., perovskite solar cells (PSCs), perovskite light-emitting diodes (PeLEDs), perovskite photodetectors, and perovskite sensors. With the inorganic Cs cation at A position, CsPbX3 perovskite shows a significantly improve stability, which has already proven in the solid-state dye sensitized solar cells and previous PSC study [7,8]. One of the most fascinating properties of CsPbX3 perovskite materials is their tunable bandgaps, which have allowed them to achieve astonishing breakthrough in a variety of optoelectronic applications. With the mixed halogen cation, a wide broad bandgap CsPbX3 could be achieved. Guhrenz et al demonstrated an excellent light-emitting device based on a mix of CsPbCl3 , CsPbBr3 , and CsPbI3 [18]. In this study, we systematically varied the halogen anion and synthesized CsPbCl3 , CsPbCl2.5 Br0.5 , CsPbCl2 Br, CsPbCl1.5 Br1.5 , CsPbClBr2 , CsPbCl0.5 Br2.5 , CsPbBr3 , CsPbBr2.5 I0.5 , CsPbBr2 I, CsPbBr1.5 I1.5 , CsPbBrI2 , CsPbBr0.5 I2.5 , and CsPbI3 by the hot-injection method, and their crystal structural and photoluminescence properties were systematically studied

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