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Controlling Tin Halide Perovskite Oxidation Dynamics in Solution for Perovskite Optoelectronic Devices
Shun Tian1, Guixiang Li1, Roland C Turnell-Ritson1
1Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, 1015, Switzerland.
Angewandte Chemie (International Ed. in English)
|May 14, 2024
Summary
Tin-based perovskites are promising for optoelectronics but prone to oxidation during fabrication. This study reveals an autoamplifying oxidation mechanism, enabling the development of low-temperature processed, high-efficiency tin-based perovskite LEDs (PeLEDs).
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Tin-based perovskites are emerging alternatives to lead halide perovskites for solar cells and LEDs.
- Dimethyl sulfoxide (DMSO) solvent, commonly used for processing, contributes to tin(II) oxidation, hindering device performance.
- Controlling Sn(II) oxidation is crucial for advancing tin-based perovskite optoelectronic applications.
Purpose of the Study:
- To investigate the kinetics and mechanism of SnI2 oxidation during film fabrication.
- To develop improved processing methods for tin-based perovskites, minimizing oxidation.
- To enhance the performance of tin-based perovskite light-emitting diodes (PeLEDs).
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy to study the oxidation kinetics of SnI2.
- Kinetic analysis to identify reaction mechanisms.
- Low-temperature processing (60°C) of tin-based perovskite films.
- Fabrication and characterization of tin-based perovskite light-emitting diodes (PeLEDs).
Main Results:
- NMR spectroscopy revealed an autoamplifying oxidation process for SnI2, accelerating over time.
- A reaction mechanism involving water and hydroiodic acid (HI) generation was proposed.
- Low-temperature processed PeLEDs achieved enhanced external quantum efficiencies (EQEs).
Conclusions:
- Understanding and mitigating Sn(II) oxidation is key to high-performance tin-based perovskites.
- Low-temperature processing and DMSO-free solvent systems offer promising routes for oxidation-free fabrication.
- This work provides a foundation for future development of stable and efficient tin-based perovskite optoelectronic devices.
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