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Carrier Trapping Deactivation by Halide Alloying in Formamidinium‐Based Lead Iodide Perovskites.
- Source :
-
Advanced Functional Materials . 12/9/2024, Vol. 34 Issue 50, p1-11. 11p. - Publication Year :
- 2024
-
Abstract
- Formamidinium lead iodide (FAPbI3) is the benchmark material for the most efficient near‐infrared perovskite light‐emitting diodes (LEDs) and a promising gain medium for perovskite‐based coherent light sources. Thus, it is crucial to understand and control its defect chemistry to harness the full potential of its exceptional radiative recombination properties. Here, this topic is addressed by tailoring the I− to Br− ratio in the perovskite composition. It is found that introducing small Br− quantities improves the yield of radiative recombination with a beneficial impact on both spontaneous and amplified spontaneous emission (ASE) and improves the semiconductor photostability leading to reduced luminescence efficiency roll‐off and enhanced radiance in LEDs. By employing photoemission electron microscopy (PEEM), this improvement in optoelectronic performance can be directly correlated to a reduced hole‐trapping activity achieved by replacing iodide with bromide, thus, providing a convenient yet powerful synthetic approach to control the defect chemistry of the material and fostering its implementation in advanced photonic platforms. [ABSTRACT FROM AUTHOR]
- Subjects :
- *COHERENCE (Optics)
*ACTIVE medium
*METAL halides
*LIGHT sources
*LEAD iodide
Subjects
Details
- Language :
- English
- ISSN :
- 1616301X
- Volume :
- 34
- Issue :
- 50
- Database :
- Academic Search Index
- Journal :
- Advanced Functional Materials
- Publication Type :
- Academic Journal
- Accession number :
- 181439843
- Full Text :
- https://doi.org/10.1002/adfm.202308545