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Light-activated interlayer contraction in two-dimensional perovskites for high-efficiency solar cells.
Wenbin Li1,2, Siraj Sidhik1,3, Boubacar Traore3,4
1Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX, USA.
Nature Nanotechnology
|November 23, 2021
Summary
Continuous light exposure causes reversible contraction in 2D halide perovskites, enhancing charge transport and boosting solar cell efficiency to 18.3%. This discovery is key for durable optoelectronic devices.
Area of Science:
- Materials Science
- Solid-State Physics
- Photovoltaics
Background:
- Designing efficient and durable optoelectronic devices requires understanding halide perovskite behavior in real-world conditions.
- Two-dimensional (2D) hybrid perovskites are promising materials for optoelectronics but their stability and performance under operation need optimization.
Purpose of the Study:
- To investigate the physical response of 2D hybrid perovskites to continuous light illumination.
- To elucidate the mechanisms behind light-induced structural changes and their impact on optoelectronic properties.
- To enhance the performance of 2D perovskite solar cells.
Main Methods:
- Continuous light illumination experiments on 2D hybrid perovskites.
- X-ray photoelectron spectroscopy (XPS) for surface charge analysis.
- Charge transport, structural, and photovoltaic measurements.
- First-principles calculations for electronic band structure.
- Flux-dependent space-charge-limited current (SCLC) measurements.
Main Results:
- Continuous light illumination induces >1% reversible out-of-plane contraction in 2D hybrid perovskites.
- Light causes positive charge accumulation on terminal iodine atoms, strengthening inter-slab I-I interactions and driving contraction.
- Light-induced contraction synchronizes with a threefold increase in carrier mobility and conductivity.
- First-principles calculations predict increased electronic band dispersion correlating with observed changes.
- Light-induced interlayer contraction enhances interlayer charge transport.
- Photovoltaic efficiency of 2D perovskite solar cells increased up to 18.3%.
Conclusions:
- Light-induced structural changes in 2D halide perovskites are directly linked to enhanced charge transport.
- The observed out-of-plane contraction is a key mechanism for improving carrier mobility and conductivity.
- Optimizing light-induced effects in 2D perovskites offers a pathway to highly efficient and durable solar cells.
