期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-018-04659-x
关键词
-
资金
- LDRD program
- DOE [EERE 1647-1544]
- State of Florida
- DOE Basic Energy Sciences Science of 100 T program
- ONR grant [N00014-17-1-2231]
- Agence Nationale pour la Recherche (TRANSHYPERO project)
- NSF [DMR-1310138, DMR-1157490, DMR-1644779]
- Robert A. Welch Foundation [C-1509]
- Air Force Office of Science Research [FA9550-14-1-0268]
Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula A(2)A'n-1MnX3n+1, where optoelectronic properties can be tuned by varying the perovskite layer thickness (n-value), and have recently emerged as efficient semiconductors with technologically relevant stability. However, fundamental questions concerning the nature of optical resonances (excitons or free carriers) and the exciton reduced mass, and their scaling with quantum well thickness, which are critical for designing efficient optoelectronic devices, remain unresolved. Here, using optical spectroscopy and 60-Tesla magnetoabsorption supported by modeling, we unambiguously demonstrate that the optical resonances arise from tightly bound excitons with both exciton reduced masses and binding energies decreasing, respectively, from 0.221 m(0) to 0.186 m(0) and from 470 meV to 125 meV with increasing thickness from n equals 1 to 5. Based on this study we propose a general scaling law to determine the binding energy of excitons in perovskite quantum wells of any layer thickness.
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