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Photocarrier dynamics in monolayer phosphorene and bulk black phosphorus
Peymon Zereshki1, Yaqing Wei, Frank Ceballos
1Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA. huizhao@ku.edu.
Nanoscale
|June 14, 2018
Summary
Monolayer phosphorene exhibits a photocarrier lifetime nine times longer than bulk black phosphorus, offering potential for advanced optoelectronics. This difference stems from unique electronic properties and nonadiabatic coupling in the bulk material.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Chemistry
Background:
- Phosphorene, a single layer of black phosphorus, and bulk black phosphorus are promising 2D materials.
- Understanding photocarrier dynamics is crucial for their optoelectronic applications.
Purpose of the Study:
- To investigate and compare photocarrier dynamics in monolayer phosphorene and bulk black phosphorus.
- To elucidate the factors influencing photocarrier lifetime and transient absorption.
- To explore the potential of monolayer phosphorene in optoelectronics.
Main Methods:
- Mechanical exfoliation to fabricate samples.
- Hexagonal boron nitride encapsulation for sample protection.
- Ultrafast pump-probe spectroscopy for photocarrier dynamics.
- Ab initio nonadiabatic molecular dynamics and time-domain density functional theory for theoretical calculations.
Main Results:
- Monolayer phosphorene shows a significantly longer photocarrier lifetime (~700 ps) compared to bulk black phosphorus (~78 ps).
- Theoretical calculations confirm this trend, attributing it to smaller bandgap and stronger nonadiabatic coupling in bulk.
- Anisotropic absorption and a layer-breathing phonon mode in bulk phosphorene were observed and analyzed.
Conclusions:
- Monolayer phosphorene possesses superior photocarrier properties compared to its bulk counterpart.
- The findings provide critical insights into the fundamental photophysics of phosphorene.
- This study highlights the potential of monolayer phosphorene for next-generation optoelectronic devices.
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