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Dual-source vapor-processed blue-emissive cesium copper iodine microplatelets with high crystallinity and stability
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-09-08 , DOI: 10.1039/d1tc03578a Jing-Jing Yan 1 , Jing-Li Ma 1 , Meng-Yao Zhang 1 , Ruo-Ting Yang 1 , Xu Chen 1 , Di Wu 1 , Yong-Tao Tian 1 , Xin-Jian Li 1 , Zhi-Feng Shi 1
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-09-08 , DOI: 10.1039/d1tc03578a Jing-Jing Yan 1 , Jing-Li Ma 1 , Meng-Yao Zhang 1 , Ruo-Ting Yang 1 , Xu Chen 1 , Di Wu 1 , Yong-Tao Tian 1 , Xin-Jian Li 1 , Zhi-Feng Shi 1
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Recently, hybrid lead-halide perovskites have attracted extensive attention because of their unique optoelectronic characteristics, such as ambipolar charge transport, tunable bandgap, high carrier mobility, low-temperature processing technique, and so on. However, due to the poor stability and lead toxicity of conventional perovskites, their practical applications and future commercialization are greatly hindered. In this study, all-inorganic lead-free Cs3Cu2I5 microplatelets (MPs) with high crystallinity and stability were successfully synthesized by a dual-source vapor deposition method for the first time. We investigated the effect of growth temperature, pressure and distance between the substrate and sources on the morphology and crystallinity of the MPs in detail. Different from the traditional lead-halide perovskites, the prepared Cs3Cu2I5 MPs show an excellent stability against ultraviolet light irradiation (∼60 h), oxygen/moisture (2 months), and heat (300–373 K, 30 cycles). In addition, the Cs3Cu2I5 MPs demonstrate excellent optical characteristics, including a wide bandgap of 3.87 eV, broadband blue emission, large Stokes shift, and strong electron–phonon coupling. It is anticipated that the above results obtained will provide valuable information for the preparation of non-toxic, stable, and highly crystallized Cs3Cu2I5 MPs that can be employed in environment-friendly and reliable optoelectronic devices, such as deep ultraviolet photodetectors and blue light-emitting diodes.
中文翻译：
具有高结晶度和稳定性的双源蒸汽处理蓝光铯铜碘微片
近年来，混合卤化铅钙钛矿因其独特的光电特性，如双极性电荷传输、可调带隙、高载流子迁移率、低温加工技术等而受到广泛关注。然而，由于传统钙钛矿稳定性差和铅毒性，其实际应用和未来商业化受到极大阻碍。在本研究中，全无机无铅 Cs 3 Cu 2 I 5首次通过双源气相沉积方法成功合成了具有高结晶度和稳定性的微血小板（MPs）。我们详细研究了生长温度、压力和衬底与源之间的距离对 MP 的形态和结晶度的影响。与传统的卤化铅钙钛矿不同，制备的 Cs 3 Cu 2 I 5 MPs 对紫外线照射（~60 小时）、氧气/水分（2 个月）和热（300-373 K，30 次循环）表现出优异的稳定性）。此外，Cs 3 Cu 2 I 5MP 表现出优异的光学特性，包括 3.87 eV 的宽带隙、宽带蓝色发射、大斯托克斯位移和强电子 - 声子耦合。预计上述结果将为制备无毒、稳定且高度结晶的 Cs 3 Cu 2 I 5 MPs提供有价值的信息，该MPs 可用于环保和可靠的光电器件，如深紫外光电探测器和蓝色发光二极管。
更新日期：2021-09-15
中文翻译：
具有高结晶度和稳定性的双源蒸汽处理蓝光铯铜碘微片
近年来，混合卤化铅钙钛矿因其独特的光电特性，如双极性电荷传输、可调带隙、高载流子迁移率、低温加工技术等而受到广泛关注。然而，由于传统钙钛矿稳定性差和铅毒性，其实际应用和未来商业化受到极大阻碍。在本研究中，全无机无铅 Cs 3 Cu 2 I 5首次通过双源气相沉积方法成功合成了具有高结晶度和稳定性的微血小板（MPs）。我们详细研究了生长温度、压力和衬底与源之间的距离对 MP 的形态和结晶度的影响。与传统的卤化铅钙钛矿不同，制备的 Cs 3 Cu 2 I 5 MPs 对紫外线照射（~60 小时）、氧气/水分（2 个月）和热（300-373 K，30 次循环）表现出优异的稳定性）。此外，Cs 3 Cu 2 I 5MP 表现出优异的光学特性，包括 3.87 eV 的宽带隙、宽带蓝色发射、大斯托克斯位移和强电子 - 声子耦合。预计上述结果将为制备无毒、稳定且高度结晶的 Cs 3 Cu 2 I 5 MPs提供有价值的信息，该MPs 可用于环保和可靠的光电器件，如深紫外光电探测器和蓝色发光二极管。
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