scholarly journals Charge Carrier Dynamics in Sn-Doped Two-Dimensional Lead Halide Perovskites Studied by Terahertz Spectroscopy

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhengyuan Qin ◽  
Chunfeng Zhang ◽  
Lan Chen ◽  
Xiaoyong Wang ◽  
Min Xiao
Keyword(s):  
Charge Carrier ◽  
Terahertz Spectroscopy ◽  
Early Stage ◽  
Carrier Dynamics ◽  
Charge Carriers ◽  
Two Dimensional ◽  
Sn Doping ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites ◽  
Lead Halide

Sn doping is established as an effective approach to promote the light emission properties in in two-dimensional lead-halide perovskites. However, the effect on the charge carrier dynamics is largely unexplored. In this work, we conduct terahertz spectroscopy to study the effects of Sn doping on the charge dynamics in the two-dimensional perovskites PEA2SnxPb1–xI4 (PEA = phenethylammonium) with different doping levels. The spectral dispersion analysis suggests that the early-stage dynamics with lifetime of ∼ 2 ps is contributed by both the transport of hot charge carriers and the polarizability of hot excitons. The long-lived component of first-order charge carrier recombination is dramatically improved when Sn doping increases, which is ascribed to the equilibrium between charge carriers and excitons with smaller bind energies in the higher-level Sn-doped samples. The finding in this work suggests Sn doping is an effective approach to optimize the charge carrier transport in 2D perovskite for potential optoelectronic applications.

scholarly journals Charge‐Carrier Dynamics, Mobilities, and Diffusion Lengths of 2D–3D Hybrid Butylammonium–Cesium–Formamidinium Lead Halide Perovskites

2019 ◽  
Vol 29 (35) ◽  
pp. 1902656 ◽  
Author(s):  
Leonardo R. V. Buizza ◽  
Timothy W. Crothers ◽  
Zhiping Wang ◽  
Jay B. Patel ◽  
Rebecca L. Milot ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites ◽  
And Diffusion ◽  
Lead Halide

Impact of Moisture on Photoexcited Charge Carrier Dynamics in Methylammonium Lead Halide Perovskites

2018 ◽  
Vol 9 (21) ◽  
pp. 6312-6320 ◽  
Author(s):  
Zhaoning Song ◽  
Niraj Shrestha ◽  
Suneth C. Watthage ◽  
Geethika K. Liyanage ◽  
Zahrah S. Almutawah ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites ◽  
Photoexcited Charge Carrier ◽  
Lead Halide

Charge-carrier dynamics in hybrid metal halide perovskites (Conference Presentation)

2016 ◽  
Author(s):  
Rebecca L. Milot ◽  
Waqaas Rehman ◽  
Giles E. Eperon ◽  
Henry J. Snaith ◽  
Michael B. Johnston ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Metal Halide ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites

scholarly journals Charge-Carrier Dynamics in 2D Hybrid Metal–Halide Perovskites

Nano Letters ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 7001-7007 ◽  
Author(s):  
Rebecca L. Milot ◽  
Rebecca J. Sutton ◽  
Giles E. Eperon ◽  
Amir Abbas Haghighirad ◽  
Josue Martinez Hardigree ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Metal Halide ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites

scholarly journals Phase segregation in mixed-halide perovskites affects charge-carrier dynamics while preserving mobility

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Silvia G. Motti ◽  
Jay B. Patel ◽  
Robert D. J. Oliver ◽  
Henry J. Snaith ◽  
Michael B. Johnston ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Management Strategies ◽  
Phase Segregation ◽  
Carrier Dynamics ◽  
Optical Pump ◽  
Charge Carrier Dynamics ◽  
Halide Perovskites ◽  
Probe Spectroscopy ◽  
The Impact

AbstractMixed halide perovskites can provide optimal bandgaps for tandem solar cells which are key to improved cost-efficiencies, but can still suffer from detrimental illumination-induced phase segregation. Here we employ optical-pump terahertz-probe spectroscopy to investigate the impact of halide segregation on the charge-carrier dynamics and transport properties of mixed halide perovskite films. We reveal that, surprisingly, halide segregation results in negligible impact to the THz charge-carrier mobilities, and that charge carriers within the I-rich phase are not strongly localised. We further demonstrate enhanced lattice anharmonicity in the segregated I-rich domains, which is likely to support ionic migration. These phonon anharmonicity effects also serve as evidence of a remarkably fast, picosecond charge funnelling into the narrow-bandgap I-rich domains. Our analysis demonstrates how minimal structural transformations during phase segregation have a dramatic effect on the charge-carrier dynamics as a result of charge funnelling. We suggest that because such enhanced recombination is radiative, performance losses may be mitigated by deployment of careful light management strategies in solar cells.

The charge carrier dynamics, efficiency and stability of two-dimensional material-based perovskite solar cells

2019 ◽  
Vol 48 (18) ◽  
pp. 4854-4891 ◽  
Author(s):  
Bing Wang ◽  
James Iocozzia ◽  
Meng Zhang ◽  
Meidan Ye ◽  
Shicheng Yan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electrical Properties ◽  
Charge Carrier ◽  
2D Materials ◽  
Perovskite Solar Cells ◽  
Carrier Dynamics ◽  
Optical And Electrical Properties ◽  
Two Dimensional ◽  
Charge Carrier Dynamics ◽  
Recent Advances

Recent advances in the use of two-dimensional (2D) materials for perovskites solar cells (PSCs) are summarized. The effects of their unique optical and electrical properties on the charge carrier dynamics of PSCs are detailed.

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