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An optical dynamic study of MAPbBr3 single crystals passivated with MAPbCl3/I3-MAPbBr3 heterojunctions
Haizhou Lu1, Huotian Zhang1, Sijian Yuan1
1State Key Laboratory of ASIC and System, SIST, Fudan University, Shanghai 200433, China. yqzhan@fudan.edu.cn lrzheng@fudan.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|January 26, 2017
Summary
Heterojunction passivation significantly improves the optical dynamics of methylammonium lead bromide (MAPbBr3) crystals. This surface treatment reduces recombination, enhancing potential applications in solar cells and LEDs.
Area of Science:
- Materials Science
- Solid-State Physics
- Photovoltaics
Background:
- Perovskite solar cells are a rapidly developing technology attracting significant research interest.
- Surface passivation, especially heterojunction-based methods, is crucial for optimizing perovskite performance.
- Understanding the optical dynamics of perovskite surfaces is key to device improvement.
Purpose of the Study:
- To investigate the optical dynamics of methylammonium lead bromide (MAPbBr3) single crystals.
- To evaluate the effect of heterojunction passivation on these optical dynamics.
- To provide insights into surface passivation strategies for perovskite optoelectronic devices.
Main Methods:
- Time-resolved spectroscopic techniques were employed to study MAPbBr3 single crystals.
- Optical dynamics were analyzed under both one-photon (355 nm, 532 nm) and two-photon (1064 nm) excitation.
- Comparisons were made between passivated and unpassivated crystal surfaces.
Main Results:
- Emission lifetimes of MAPbBr3 crystals were orders of magnitude longer under two-photon (1064 nm) than one-photon excitation.
- Surface passivation significantly tuned emission lifetimes under 355 nm excitation.
- Lifetime changes under 1064 nm excitation were less pronounced after passivation, indicating reduced surface quenching.
- MAPbCl3-MAPbBr3 heterojunctions were shown to reduce surface recombination channels.
Conclusions:
- Surface passivation, particularly with MAPbCl3-MAPbBr3 heterojunctions, effectively mitigates surface recombination in MAPbBr3.
- These findings offer direct evidence of surface quenching and its reduction through passivation.
- The results highlight the potential of heterojunction passivation for enhancing perovskite-based solar cells, LEDs, and detectors.
