期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 22, 页码 3958-3963出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz502086e
关键词
-
类别
资金
- Agence Nationale pour la Recherche (Grant PEROCAI)
- Triangle de la Physique (Grant CAVPER)
- DIM Nano-K (Grant PEROVOLT)
- Institut d'Alembert of Ecole Normale Superieure de Cachan
We focus here our attention on a particular family of 2D-layered and 3D hybrid perovskite molecular crystals, the mixed perovskites (C6H5-C2H4-NH3)(2)PbZ(4(1-x))Y(4x) and (CH3-NH3)PbZ(3(1-x))Y(3x), where Z and Y are halogen ions such as I, Br, and Cl. Studying experimentally the disorder-induced effects on the optical properties of the 2D mixed layered materials, we demonstrate that they can be considered as pseudobinary alloys, exactly like Ga1-xAlxAs, Cd1-xHgxTe inorganic semiconductors, or previously reported 3D mixed hybrid perovskite compounds. 2D-layered and 3D hybrid perovskites afford similar continuous optical tunability at room temperature. Our theoretical analysis allows one to describe the influence of alloying on the excitonic properties of 2D-layered perovskite molecular crystals. This model is further refined by considering different Bohr radii for pure compounds. This study confirms that despite a large binding energy of several 100 meV, the 2D excitons present a Wannier character rather than a Frenkel character. The small inhomogeneous broadening previously reported in 3D hybrid compounds at low temperature is similarly consistent with the Wannier character of free excitons.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据