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Stacking Effects on Electron-Phonon Coupling in Layered Hybrid Perovskites via Microstrain Manipulation.
ACS Nano ( IF 15.8 ) Pub Date : 2020-04-15 , DOI: 10.1021/acsnano.0c00907 Qin Du 1 , Cheng Zhu 1 , Zixi Yin 2 , Guangren Na 3 , Chuantong Cheng 4 , Ying Han 1 , Na Liu 1 , Xiuxiu Niu 1 , Huanping Zhou 5 , Hongda Chen 4 , Lijun Zhang 3 , Shengye Jin 2 , Qi Chen 1
ACS Nano ( IF 15.8 ) Pub Date : 2020-04-15 , DOI: 10.1021/acsnano.0c00907 Qin Du 1 , Cheng Zhu 1 , Zixi Yin 2 , Guangren Na 3 , Chuantong Cheng 4 , Ying Han 1 , Na Liu 1 , Xiuxiu Niu 1 , Huanping Zhou 5 , Hongda Chen 4 , Lijun Zhang 3 , Shengye Jin 2 , Qi Chen 1
Affiliation
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Organic-inorganic hybrid halide perovskites (ABX3), especially layered 2D perovskites, have been recognized as promising semiconductors due to their tunable crystal structure and unique optoelectronic properties. A-site cations, as spacers, allow various metal halide assemblies, but the stacking pattern and the influence of their collective behavior on the properties of the resultant materials remain ambiguous. Here, the cation-stacking effects in the 2D perovskite single crystals, with a focus on the electron-phonon interaction, are investigated. We reveal the different photoluminescence from the surface region and the interior of the crystal, which is due to the residual strain induced by A-site cation stacking. We also examine the cation-stacking effects on the electron-phonon interaction, which is further employed to tailor the optoelectronic properties of the resultant 2D crystals. By reducing the microstrain, we reduce the electron-phonon coupling to improve the mobility and their stability against electric field in the corresponding crystals. Our study suggests a way to manipulate the optoelectronic properties in 2D perovskite materials by rational design of cation stacking.
中文翻译：
通过微应变操纵对层状混合钙钛矿中电子-声子耦合的堆积效应。
有机-无机杂化卤化物钙钛矿（ABX3），尤其是层状2D钙钛矿，由于其可调谐的晶体结构和独特的光电性能而被公认为有前途的半导体。作为间隔物的A-位阳离子允许各种金属卤化物组装，但堆积方式及其集体行为对所得材料性能的影响仍然不明确。在此，研究了二维钙钛矿单晶中的阳离子堆积效应，重点是电子-声子相互作用。我们揭示了晶体表面区域和内部不同的光致发光，这是由于A位阳离子堆叠引起的残余应变所致。我们还研究了阳离子堆积对电子-声子相互作用的影响，进一步用于调整所得2D晶体的光电性能。通过减少微应变，我们减少了电子-声子耦合，以提高迁移率及其在相应晶体中对电场的稳定性。我们的研究提出了一种通过合理设计阳离子堆叠来控制2D钙钛矿材料中光电特性的方法。
更新日期：2020-04-15
中文翻译：
通过微应变操纵对层状混合钙钛矿中电子-声子耦合的堆积效应。
有机-无机杂化卤化物钙钛矿（ABX3），尤其是层状2D钙钛矿，由于其可调谐的晶体结构和独特的光电性能而被公认为有前途的半导体。作为间隔物的A-位阳离子允许各种金属卤化物组装，但堆积方式及其集体行为对所得材料性能的影响仍然不明确。在此，研究了二维钙钛矿单晶中的阳离子堆积效应，重点是电子-声子相互作用。我们揭示了晶体表面区域和内部不同的光致发光，这是由于A位阳离子堆叠引起的残余应变所致。我们还研究了阳离子堆积对电子-声子相互作用的影响，进一步用于调整所得2D晶体的光电性能。通过减少微应变，我们减少了电子-声子耦合，以提高迁移率及其在相应晶体中对电场的稳定性。我们的研究提出了一种通过合理设计阳离子堆叠来控制2D钙钛矿材料中光电特性的方法。
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