Time-Resolved Changes in Dielectric Constant of Metal Halide Perovskites under Illumination

被引：17

作者：

Hong, Min Ji ^{[1
]}

Zhu, Liangdong ^{[2
]}

Chen, Cheng ^{[2
]}

Tang, Longteng ^{[2
]}

Lin, Yen-Hung ^{[3
]}

Li, Wen ^{[3
,4
]}

Johnson, Rose ^{[5
]}

Chattopadhyay, Shirsopratim ^{[1
]}

Snaith, Henry J. ^{[3
]}

Fang, Chong ^{[2
]}

Labram, John G. ^{[1
]}

机构：

[1] Oregon State Univ, Sch Elect Engn & Comp Sci, Corvallis, OR 97331 USA

[2] Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA

[3] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[4] Northwestern Polytech Univ, Inst Flexible Elect IFE, Xian 710072, Peoples R China

[5] Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2020年 / 142卷 / 47期

关键词：

CHARGE-CARRIERS; MICROWAVE CONDUCTIVITY; HIGH-PERFORMANCE; SOLAR-CELLS; SPECTROSCOPY; DYNAMICS; MOBILITY; ELECTRONS;

D O I：

10.1021/jacs.0c07307

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Despite their impressive performance as a solar absorber, much remains unknown on the fundamental properties of metal halide perovskites (MHPs). Their polar nature in particular is an intense area of study, and the relative permittivity (epsilon(r)) is a parameter widely used to quantify polarization over a range of different time scales. In this report, we have exploited frequency-dependent time-resolved microwave conductivity (TRMC) to study how epsilon(r) values of a range of MHPs change as a function of time, upon optical illumination. Further characterization of charge carriers and polarizability are conducted by femtosecond transient absorption and stimulated Raman spectroscopy. We find that changes in epsilon(r) are roughly proportional to photogenerated carrier density but decay with a shorter time constant than conductance, suggesting that the presence of charge carriers alone does not determine polarization.

引用

页码：19799 / 19803

页数：5

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