Photoluminescence Enhancement in Formamidinium Lead Iodide Thin Films

Formamidinium lead iodide (FAPbI3) has a broader absorption spectrum and better thermal stability than the most famous methylammonium lead iodide, thus exhibiting great potential for photovoltaic applications. In this report, the light‐induced photoluminescence (PL) evolution in FAPbI3 thin films is...

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Bibliographic Details
Published in:Advanced functional materials 2016-07, Vol.26 (26), p.4653-4659
Main Authors: Fang, Hong-Hua, Wang, Feng, Adjokatse, Sampson, Zhao, Ni, Loi, Maria Antonietta
Format: Article
Language:English
Subjects:
Evolution
formamidinium lead iodide
Illumination
Iodides
laser healing
Lasers
Moisture
perovskite
Perovskites
Photoluminescence
Thin films
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Summary:Formamidinium lead iodide (FAPbI3) has a broader absorption spectrum and better thermal stability than the most famous methylammonium lead iodide, thus exhibiting great potential for photovoltaic applications. In this report, the light‐induced photoluminescence (PL) evolution in FAPbI3 thin films is investigated. The PL intensity evolution is found to be strongly dependent on the atmosphere surrounding the samples. When the film is exposed to air, its photoluminescence intensity is enhanced more than 140 times after continuous ultraviolet laser illumination for 2 h, and the average lifetime is prolonged from 17 to 389 ns. The enhanced photoluminescence implies that the trap density is significantly reduced. The comparative study of the photoluminescence properties in air, nitrogen, and oxygen/helium environment suggests that moisture is important for the PL enhancement. This is explained in terms of moisture‐assisted light‐healing effect in FAPbI3 thin films. With this study, a new method is demonstrated to increase and control the quality of hybrid perovskite thin films. Laser healing perovskites: Photophysical properties of FAPbI3 thin films under continuous UV illumination are investigated. Giant light‐induced enhancement of the photoluminescence intensity is observed when the sample is exposed to air. It is demonstrated that moisture plays a critical role in the light‐induced photoluminescence enhancement effect. Laser healing in air can become a way to improve the quality of perovskite thin films.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201600715