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

被引：11

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.

引用

页数：9