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In Situ and Quantitative Vapor/Solid Anion Exchange for Composition Regulation and Optical Properties of Perovskites
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-05-24 , DOI: 10.1002/adom.202002186 Zhenhua Zhang 1 , Hao Wei 2 , Arumugam Gowri Manohari 1 , Daotong You 1 , Ru Wang 1 , Zhuxin Li 1 , Wei Liu 1 , Jinping Chen 1 , Yizhi Zhu 1 , Zengliang Shi 1 , Qiannan Cui 1 , ShuZhou Li 2 , ChunXiang Xu 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-05-24 , DOI: 10.1002/adom.202002186 Zhenhua Zhang 1 , Hao Wei 2 , Arumugam Gowri Manohari 1 , Daotong You 1 , Ru Wang 1 , Zhuxin Li 1 , Wei Liu 1 , Jinping Chen 1 , Yizhi Zhu 1 , Zengliang Shi 1 , Qiannan Cui 1 , ShuZhou Li 2 , ChunXiang Xu 1
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Anion exchange is a convenient postsynthetic transformation method to adjust the composition and bandgap of semiconductors. However, it is still a challenge to achieve the desired halogen-variable perovskites due to rapid and uncontrollable reaction and difficulty to synthesize directly. Herein, a facile and gentle vapor/solid anion exchange strategy is reported to control the composition in situ and quantitatively for adjusting the properties of MAPbI3−xBrx (x = 0 to 3, MA = CH3NH3) films continuously. By controlling the reaction time, the films have a tunable bandgap from 1.58 to 2.25 eV and a continuously blue-shifted photoluminescence peak from 771.1 to 540.5 nm. The regularly shifted X-ray diffraction peaks reveal the successive variation in composition and crystal lattice with anion exchange and all the MAPbI3−xBrx films have a pure phase. More importantly, a universal empirical equation for in situ and quantitative composition regulation is extracted, which is supported by theoretical analysis and simulation on the anion exchange process. The anion exchange strategy and empirical equation are appropriate not only for perovskite but also for other related materials. This work may be valuable for further applications such as in situ quantitative reversible composition-tunable perovskites, solar cells, white LEDs, and lasers.
中文翻译：
用于钙钛矿组成调节和光学性能的原位和定量蒸汽/固体阴离子交换
阴离子交换是一种方便的合成后转化方法，用于调整半导体的组成和带隙。然而，由于反应快速且不可控且难以直接合成，实现所需的卤素可变钙钛矿仍然是一个挑战。在此，据报道，一种简便且温和的气/固阴离子交换策略可原位和定量地控制组成以调节 MAPbI 3− x Br x ( x = 0 至 3, MA = CH 3 NH 3) 连续拍摄。通过控制反应时间，薄膜具有从 1.58 到 2.25 eV 的可调带隙和从 771.1 到 540.5 nm 的连续蓝移光致发光峰。规则位移的 X 射线衍射峰揭示了阴离子交换和所有 MAPbI 3- x Br x组成和晶格的连续变化薄膜具有纯相。更重要的是，提取了用于原位和定量成分调节的通用经验方程，该方程得到了阴离子交换过程的理论分析和模拟的支持。阴离子交换策略和经验方程不仅适用于钙钛矿，也适用于其他相关材料。这项工作可能对进一步的应用有价值，例如原位定量可逆成分可调钙钛矿、太阳能电池、白光 LED 和激光器。
更新日期：2021-05-24
中文翻译：
用于钙钛矿组成调节和光学性能的原位和定量蒸汽/固体阴离子交换
阴离子交换是一种方便的合成后转化方法，用于调整半导体的组成和带隙。然而，由于反应快速且不可控且难以直接合成，实现所需的卤素可变钙钛矿仍然是一个挑战。在此，据报道，一种简便且温和的气/固阴离子交换策略可原位和定量地控制组成以调节 MAPbI 3− x Br x ( x = 0 至 3, MA = CH 3 NH 3) 连续拍摄。通过控制反应时间，薄膜具有从 1.58 到 2.25 eV 的可调带隙和从 771.1 到 540.5 nm 的连续蓝移光致发光峰。规则位移的 X 射线衍射峰揭示了阴离子交换和所有 MAPbI 3- x Br x组成和晶格的连续变化薄膜具有纯相。更重要的是，提取了用于原位和定量成分调节的通用经验方程，该方程得到了阴离子交换过程的理论分析和模拟的支持。阴离子交换策略和经验方程不仅适用于钙钛矿，也适用于其他相关材料。这项工作可能对进一步的应用有价值，例如原位定量可逆成分可调钙钛矿、太阳能电池、白光 LED 和激光器。
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