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Multidentate Molecule Anchoring Halide Perovskite Surface and Regulating Crystallization Kinetics toward Efficient
Shuang-Qiao Sun1, Qi Sun1, Yu-Jin Ji1
1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|December 29, 2022
Summary
Formamidine sulfinic acid (FSA) is a novel multidentate molecule that effectively passivates perovskite defects. This new approach enhances perovskite light-emitting diodes (PeLEDs) stability and performance.
Area of Science:
- Materials Science
- Optoelectronics
- Chemistry
Background:
- Functional passivators are crucial for minimizing non-radiative recombination losses in perovskite light-emitting diodes (PeLEDs).
- Existing passivators often suffer from weak anchoring abilities, leading to limited passivation effectiveness and short-term stability.
- These limitations pose significant challenges for developing high-performance PeLEDs.
Purpose of the Study:
- To introduce formamidine sulfinic acid (FSA) as a novel multidentate passivator for perovskites.
- To investigate the passivation mechanism and effectiveness of FSA in improving perovskite stability and optoelectronic properties.
- To demonstrate the potential of FSA in enhancing the performance of green-emitting PeLEDs.
Main Methods:
- Synthesis and characterization of formamidine sulfinic acid (FSA).
- Application of FSA as a passivator to perovskite materials for PeLED fabrication.
- Evaluation of the passivation effects on perovskite crystallization, defect mitigation, and device performance (EQE, operating lifetime).
- Spectroscopic analysis to understand the interaction between FSA and perovskite structure ([PbBr6]4-).
Main Results:
- FSA, with its multifunctional groups (S=O, C=N, NH2), effectively coordinates with lead and bromide ions in perovskites.
- This coordination provides robust chemical passivation, leading to highly stable perovskite emitters.
- FSA interaction with [PbBr6]4- inhibits the formation of unfavorable low-n domains, minimizing energy transfer losses.
- FSA-passivated green-emitting PeLEDs achieved a high external quantum efficiency (EQE) of 26.5%.
- A fourfold enhancement in operating lifetime was observed compared to control devices.
Conclusions:
- Formamidine sulfinic acid (FSA) is a highly effective multidentate passivator for perovskites.
- FSA significantly enhances the stability and performance of perovskite light-emitting diodes (PeLEDs).
- Multidentate molecules represent a promising strategy for sustainable and effective perovskite passivation.
