Published January 1, 2019 | Version v1
Journal article Metadata-only

Ultrafast Carrier Dynamics and Terahertz Photoconductivity of Mixed-Cation and Lead Mixed-Halide Hybrid Perovskites

Creators

  • 1. Department of Physics, Shanghai University, Shanghai 200444 (China)
  • 2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China)
  • 3. Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444 (China)
  • 4. College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072 (China)

Description

Using time-dependent terahertz spectroscopy, we investigate the role of mixed-cation and mixed-halide on the ultrafast photoconductivity dynamics of two different methylammonium (MA) lead-iodide perovskite thin films. It is found that the dynamics of conductivity after photoexcitation reveals significant correlation on the microscopy crystalline features of the samples. Our results show that mixed-cation and lead mixed-halide affect the charge carrier dynamics of the lead-iodide perovskites. In the (5-AVA)0.05(MA)0.95PbI2.95Cl0.05/spiro thin film, we observe a much weaker saturation trend of the initial photoconductivity with high excitation fluence, which is attributed to the combined effect of sequential charge carrier generation, transfer, cooling and polaron formation. (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/0256-307X/36/2/028401

Additional details

Identifiers

DOI
10.1088/0256-307X/36/2/028401;

Publishing Information

Journal Title
Chinese Physics Letters
Journal Volume
36
Journal Issue
2
Journal Page Range
[9 p.]
ISSN
0256-307X
CODEN
CPLEEU

INIS

Country of Publication
China
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
52041199
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
CHARGE CARRIERS; CORRELATIONS; EXCITATION; LEAD IODIDES; PEROVSKITE; PHOTOCONDUCTIVITY; SPECTROSCOPY; THIN FILMS; THZ RANGE; TIME DEPENDENCE
Descriptors DEC
ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ENERGY-LEVEL TRANSITIONS; FILMS; FREQUENCY RANGE; HALIDES; HALOGEN COMPOUNDS; IODIDES; IODINE COMPOUNDS; LEAD COMPOUNDS; LEAD HALIDES; MINERALS; OXIDE MINERALS; PEROVSKITES; PHYSICAL PROPERTIES