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Design principles for electronic charge transport in solution-processed vertically stacked 2D perovskite quantum
Hsinhan Tsai1,2, Reza Asadpour3, Jean-Christophe Blancon1
1Division of Materials Physics and Application, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
Nature Communications
|June 1, 2018
Summary
Charge transport in 2D perovskite quantum wells is dominated by electric field-assisted separation and transport of electron-hole pairs. This finding provides guidelines for designing efficient 2D perovskite photovoltaics and optoelectronic devices.
Area of Science:
- Materials Science
- Solid State Physics
- Quantum Mechanics
Background:
- Quantum-well devices like photovoltaics rely on understanding charge transport.
- Ruddlesden-Popper halide perovskites are 2D quantum wells with high solar cell efficiency.
- Charge transport mechanisms in these materials are poorly understood, complicated by excitons.
Purpose of the Study:
- To determine the dominant photocurrent collection mechanism in 2D perovskite quantum wells.
- To provide fundamental guidelines for designing advanced 2D perovskite optoelectronic devices.
Main Methods:
- In-depth device characterization.
- Comprehensive device modeling.
- Self-consistent reproduction of experimental findings.
Main Results:
- Unambiguously determined that photocurrent collection is via electric field-assisted electron-hole pair separation.
- Established transport across potential barriers as the dominant mechanism.
- Developed a model that accurately reproduces experimental results.
Conclusions:
- Electric field-assisted charge transport is key in 2D perovskite quantum wells.
- Findings offer essential guidelines for molecular and device design in 2D perovskite photovoltaics.
- Results are applicable to other quantum-confined systems.
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