Molecularly thin two-dimensional hybrid perovskites with tunable optoelectronic properties due to reversible surface relaxation

被引：359

作者：

Leng, Kai ^{[1
,2
,3
,4
]}

Abdelwahab, Ibrahim ^{[1
,3
,4
,5
]}

Verzhbitskiy, Ivan ^{[3
,4
,6
]}

Telychko, Mykola ^{[1
,3
,4
]}

Chu, Leiqiang ^{[1
,3
,4
]}

Fu, Wei ^{[1
,3
,4
]}

Chi, Xiao ^{[1
]}

Guo, Na ^{[6
]}

Chen, Zhihui ^{[1
]}

Chen, Zhongxin ^{[1
,5
]}

Zhang, Chun ^{[6
]}

Xu, Qing-Hua ^{[1
]}

Lu, Jiong ^{[1
,3
,4
]}

Chhowalla, Manish ^{[7
]}

Eda, Goki ^{[1
,3
,4
,6
]}

Loh, Kian Ping ^{[1
,2
,3
,4
]}

机构：

[1] Natl Univ Singapore, Dept Chem, Singapore, Singapore

[2] Solar Energy Res Inst Singapore, Singapore, Singapore

[3] Ctr Adv 2D Mat, Singapore, Singapore

[4] Graphene Res Ctr, Singapore, Singapore

[5] Natl Univ Singapore, NUS Grad Sch Integrat Sci & Engn, Singapore, Singapore

[6] Natl Univ Singapore, Dept Phys, Singapore, Singapore

[7] Rutgers State Univ, Mat Sci & Engn, Piscataway, NJ USA

来源：

NATURE MATERIALS | 2018年 / 17卷 / 10期

关键词：

ORGANIC-INORGANIC PEROVSKITES; OPTICAL-PROPERTIES; PHOTODETECTORS;

D O I：

10.1038/s41563-018-0164-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Due to their layered structure, two-dimensional Ruddlesden-Popper perovskites (RPPs), composed of multiple organic/inorganic quantum wells, can in principle be exfoliated down to few and single layers. These molecularly thin layers are expected to present unique properties with respect to the bulk counterpart, due to increased lattice deformations caused by interface strain. Here, we have synthesized centimetre-sized, pure-phase single-crystal RPP perovskites (CH3(CH2)(3)NH3)(2)(CH3NH3)n(-1)Pb(n)I(3n+1) (n = 1-4) from which single quantum well layers have been exfoliated. We observed a reversible shift in excitonic energies induced by laser annealing on exfoliated layers encapsulated by hexagonal boron nitride. Moreover, a highly efficient photodetector was fabricated using a molecularly thin n = 4 RPP crystal, showing a photogain of 10(5) and an internal quantum efficiency of similar to 34%. Our results suggest that, thanks to their dynamic structure, atomically thin perovskites enable an additional degree of control for the bandgap engineering of these materials

引用

页码：908 / +

页数：9

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