Single Crystals of Mixed-Cation Copper-Based Perovskite with Trimodal Bandgap Behavior

被引：13
作者：
Elattar, Amr [1 ,2 ]
Li, Wenhui [3 ,4 ]
Suzuki, Hiroo [1 ]
Kambe, Takashi [6 ]
Nishikawa, Takeshi [1 ]
Kyaw, Aung Ko Ko [3 ,4 ,5 ]
Hayashi, Yasuhiko [1 ]
机构：
[1] Okayama Univ, Grad Sch Nat Sci & Technol, Kita Ku, 3-1-1 Tsushimanaka, Okayama 7008530, Japan
[2] Ain Shams Univ, Fac Sci, Dept Chem, Cairo 11566, Egypt
[3] Southern Univ Sci & Technol, Guangdong Univ Key Lab Adv Quantum Dot Displays &, Shenzhen 518055, Peoples R China
[4] Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
[5] Shenzhen Planck Innovat Technol Co Ltd, 8 Liuhe Rd, Shenzhen 518100, Guangdong, Peoples R China
[6] Okayama Univ, Dept Phys, Okayama 7008530, Japan
来源：
CHEMISTRY-A EUROPEAN JOURNAL | 2022年 / 28卷 / 26期
基金：
中国国家自然科学基金;
关键词：
copper; exfoliation; mixed cation; perovskite; solar cells; two dimensional; INORGANIC HYBRID PEROVSKITE; PERFORMANCE; ABSORBER; RUBIDIUM; STATE;
D O I：
10.1002/chem.202104316
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Two-dimensional (2D) hybrid perovskites with novel functionalities and structural diversity are a perfect platform for emerging optoelectronic devices such as photodetectors, light-emitting diodes, and solar cells. Here, we demonstrate that excess concentration of Cesium bromide (CsBr) is key to the formation of easily exfoliated 2D Cs2Cu(Cl/Br)(4) perovskite crystal. Furthermore, by employing this trick to 2D perovskite MA(2)Cu(Cl/Br)(4) (MA=methylammonium), we achieve a phase-pure easily exfoliated 2D mixed-cation (MA/Cs)(2)Cu(Cl/Br)(4) perovskite crystal, which exhibits reduced bandgap (1.53 eV) with ferromagnetic behavior and photovoltaic property. The resultant mixed-cation structured device reveals enhanced efficiency compared to all MA and all Cs counterparts. These findings demonstrate the importance of cation-engineering in developing innovative materials with novel properties.
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页数：9
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