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Thermal Stability of the Black Perovskite Phase in Cesium Lead Iodide Nanocrystals Under Humid Conditions
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-12-02 , DOI: 10.1021/acs.chemmater.9b03533 Cherrelle J. Thomas 1 , Yangning Zhang 1 , Adrien Guillaussier 1 , Khaled Bdeir 1, 2 , Omar F. Aly 1 , Hyun Gyung Kim 1 , Jungchul Noh 1 , Lauren C. Reimnitz 1 , Junjie Li 3 , Francis Leonard Deepak 3 , Detlef-M. Smilgies 4 , Delia J. Milliron 1 , Brian A. Korgel 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-12-02 , DOI: 10.1021/acs.chemmater.9b03533 Cherrelle J. Thomas 1 , Yangning Zhang 1 , Adrien Guillaussier 1 , Khaled Bdeir 1, 2 , Omar F. Aly 1 , Hyun Gyung Kim 1 , Jungchul Noh 1 , Lauren C. Reimnitz 1 , Junjie Li 3 , Francis Leonard Deepak 3 , Detlef-M. Smilgies 4 , Delia J. Milliron 1 , Brian A. Korgel 1
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The equilibrium phase of cesium lead iodide (CsPbI3) at room temperature is yellow and optically inactive due to its indirect band gap. The metastable black phase of CsPbI3 on the other hand exhibits optical properties that are suitable for photovoltaic and light-emitting devices. Here, we examine the stability of the black phase of ligand-stabilized CsPbI3 nanocrystals heated in humid air. Water vapor is known to catalyze the transition of CsPbI3 from the black phase to the yellow phase. Uniform nanocrystals with cube shape were synthesized with capping ligand mixtures of oleylamine and oleic acid or diisooctylphosphinic acid, assembled into superlattices with preferred crystal orientation, and studied using grazing incidence small- and wide-angle X-ray scattering with in situ heating. The black-phase nanocrystals are found to inhabit the γ-orthorhombic phase and do not revert to the equilibrium yellow δ-orthorhombic phase until reaching a relatively high temperature, between 170 and 200 °C, coinciding with superlattice degradation.
中文翻译：
潮湿条件下碘化铯铅纳米晶体中黑色钙钛矿相的热稳定性
碘化铯碘化铯（CsPbI 3）在室温下的平衡相为黄色，并且由于其间接的带隙而没有光学活性。另一方面，CsPbI 3的亚稳态黑相具有适用于光伏和发光器件的光学性能。在这里，我们检查了在潮湿空气中加热的配体稳定的CsPbI 3纳米晶体黑相的稳定性。已知水蒸气催化CsPbI 3的转变从黑色阶段到黄色阶段。用油胺和油酸或二异辛基次膦酸的封端配体混合物合成具有立方体形状的均匀纳米晶体，组装成具有优选晶体取向的超晶格，并使用掠射入射小和广角X射线散射并就地加热进行研究。发现黑色相纳米晶体存在于γ-斜方晶相中，并且直到达到170至200°C的相对较高的温度时才恢复到平衡的黄色δ-斜方晶相，这与超晶格的降解相吻合。
更新日期：2019-12-02
中文翻译：
潮湿条件下碘化铯铅纳米晶体中黑色钙钛矿相的热稳定性
碘化铯碘化铯（CsPbI 3）在室温下的平衡相为黄色，并且由于其间接的带隙而没有光学活性。另一方面，CsPbI 3的亚稳态黑相具有适用于光伏和发光器件的光学性能。在这里，我们检查了在潮湿空气中加热的配体稳定的CsPbI 3纳米晶体黑相的稳定性。已知水蒸气催化CsPbI 3的转变从黑色阶段到黄色阶段。用油胺和油酸或二异辛基次膦酸的封端配体混合物合成具有立方体形状的均匀纳米晶体，组装成具有优选晶体取向的超晶格，并使用掠射入射小和广角X射线散射并就地加热进行研究。发现黑色相纳米晶体存在于γ-斜方晶相中，并且直到达到170至200°C的相对较高的温度时才恢复到平衡的黄色δ-斜方晶相，这与超晶格的降解相吻合。
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