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Stabilizing FASnI3-based perovskite light-emitting diodes with crystallization control.
Guoling Zhang1, Shiyu Xing1, Xuhui Cao1
1State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310027, China. daweidi@zju.edu.cn.
Nanoscale
|March 29, 2023
Summary
Researchers enhanced the stability of lead-free perovskite LEDs using formamidinium tin iodide (FASnI3) and phenethylamine iodide (PEAI). This innovation significantly improves device longevity for optoelectronic applications.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Chemistry
Background:
- Lead toxicity is a major hurdle for perovskite optoelectronics.
- Formamidinium tin iodide (FASnI3) perovskites offer a lead-free alternative but exhibit poor stability in light-emitting applications.
- Existing FASnI3-based perovskite LEDs (PeLEDs) have limited operational lifetimes.
Purpose of the Study:
- To enhance the stability and performance of lead-free FASnI3-based perovskite LEDs (PeLEDs).
- To investigate the role of 2D precursors in controlling perovskite crystallization and reducing defects.
- To enable practical applications of lead-free perovskite optoelectronics.
Main Methods:
- Incorporation of a 2D precursor, phenethylamine iodide (PEAI), into FASnI3 perovskite formulations.
- Controlled crystallization of mixed-dimensional perovskite emitters.
- Characterization of defect density and suppression of Sn2+ oxidation.
- Performance testing of PeLEDs, including external quantum efficiency (EQE) and operational lifetime (T50).
Main Results:
- Inclusion of PEAI led to reduced defect density and suppressed Sn2+ to Sn4+ oxidation.
- Optimized FASnI3-based PeLEDs achieved a 1.5% EQE, a 10-fold improvement over control devices.
- Record-long T50 lifetime of 10.3 hours at 100 mA cm-2 was demonstrated for FASnI3-based PeLEDs.
Conclusions:
- The strategy of incorporating 2D precursors effectively enhances the stability of FASnI3-based PeLEDs.
- This approach offers a promising pathway for developing robust and efficient lead-free perovskite optoelectronics.
- The improved stability opens avenues for the commercialization of lead-free perovskite light-emitting devices.
