Scaling law for excitons in 2D perovskite quantum wells.
Scaling law for excitons in 2D perovskite quantum wells.
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DOI：
10.1038/s41467-018-04659-x
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发表时间：
2018-06-08
影响因子：
16.6
通讯作者：
Mohite AD
中科院分区：
文献类型：
--
作者：
Blancon JC;Stier AV;Tsai H;Nie W;Stoumpos CC;Traoré B;Pedesseau L;Kepenekian M;Katsutani F;Noe GT;Kono J;Tretiak S;Crooker SA;Katan C;Kanatzidis MG;Crochet JJ;Even J;Mohite AD
Ruddlesden-Popper卤化物钙钛矿是二维溶液处理的量子阱，通式为A2A 'n-1MnX3n +1，其中光电特性可以通过改变钙钛矿层厚度（n值）来调节，并且最近成为具有技术相关稳定性的高效半导体。然而，关于光学共振（激子或自由载流子）的本质和激子减少质量的基本问题，以及它们随量子阱厚度的缩放，这些对设计高效光电器件至关重要，仍然没有解决。在这里，利用光谱学和模型支持的60特斯拉磁吸收，我们明确地证明了光学共振是由紧密结合的激子引起的，随着厚度从n = 1增加到5，激子的质量和束缚能分别从0.221 m0减少到0.186 m0和从470 meV减少到125 meV。在此基础上，我们提出了确定任意层厚钙钛矿量子阱中激子结合能的一般标度定律。混合二维层状钙钛矿是溶液处理的量子阱，其光电特性可通过改变无机板的厚度来调节。在这里，Blancon等人得出了层状二维钙钛矿中激子性质依赖的一般行为。
Ruddlesden–Popper halide perovskites are 2D solution-processed quantum wells with a general formula A2A’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 magneto-absorption 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 m0 to 0.186 m0 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. Hybrid 2D layered perovskites are solution-processed quantum wells whose optoelectronic properties are tunable by varying the thickness of the inorganic slab. Here Blancon et al. work out a general behavior for dependence of the excitonic properties in layered 2D perovskites.
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DOI：
10.1021/acs.jpcc.7b10705
发表时间：
2017-11-30
期刊：
The journal of physical chemistry. C, Nanomaterials and interfaces
影响因子：
--
作者：
Gélvez-Rueda MC;Hutter EM;Cao DH;Renaud N;Stoumpos CC;Hupp JT;Savenije TJ;Kanatzidis MG;Grozema FC
通讯作者：
Grozema FC
影响因子：
3.7
作者：
ISHIHARA, T;TAKAHASHI, J;GOTO, T
通讯作者：
GOTO, T
影响因子：
15
作者：
Cortecchia, Daniele;Neutzner, Stefanie;Petrozza, Annamaria
通讯作者：
Petrozza, Annamaria
影响因子：
2.8
作者：
HIRASAWA, M;ISHIHARA, T;MIURA, N
通讯作者：
MIURA, N
影响因子：
2.9
作者：
Even, Jacky;Pedesseau, Laurent;Katan, Claudine
通讯作者：
Katan, Claudine