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Published on: September 8, 2017
Tuning Precursor-Amine Interactions for Light-Emitting Lead Bromide Perovskites
Shiyu Xing1, Yaxiao Lian1, Runchen Lai1
1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310027, China.
Secondary amines like N-methyl-2-phenylethylamine (N-PEA) enhance formamidinium perovskite films by strengthening hydrogen bonds. This leads to high-quality perovskite films with improved photoluminescence quantum efficiencies and stable green perovskite light-emitting diodes.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Organic additives with amino groups improve formamidinium (FA)-based hybrid perovskites for optoelectronic applications.
- A lack of detailed understanding regarding the influence of amino additives hinders perovskite material development.
Purpose of the Study:
- To investigate the interactions between lead bromide perovskite precursors and phenethylamine (PEA) derivatives.
- To elucidate how specific chemical structures of amino additives affect perovskite film quality and device performance.
Main Methods:
- Investigated interactions of lead bromide perovskite precursors with phenethylamine (PEA) and its derivatives.
- Analyzed the effect of secondary amine N-methyl-2-phenylethylamine (N-PEA) on hydrogen bonding with FABr.
- Fabricated and characterized green perovskite light-emitting diodes (PeLEDs).
Main Results:
- Only the secondary amine, N-PEA, formed strengthened hydrogen bonds with FABr in precursor solutions, enabling high-quality perovskite film formation.
- Perovskite films exhibited retained photoluminescence quantum efficiencies (PLQEs) up to 82% on charge-transport substrates, showing reduced trap sensitivity.
- Green PeLEDs achieved peak external quantum efficiencies of 12.7% and operational lifetimes exceeding 10 hours.
Conclusions:
- Secondary amines, specifically N-PEA, are crucial for forming high-quality formamidinium perovskite films through enhanced hydrogen bonding.
- The improved film quality translates to reduced interfacial trap sensitivity and enhanced device performance in PeLEDs.
- This study provides critical insights into additive engineering for advanced perovskite optoelectronics.
