Efficient defect passivation with niacin for high-performance and stable perovskite solar cells

Defects, inevitably produced in solution-processed halide perovskite films, can act as charge carrier recombination centers to induce severe energy loss in perovskite solar cells (PSCs). Suppressing these trap states has been regarded as one of the effective strategies to improve the photovoltaic pe...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2021-05, Vol.9 (19), p.6217-6224
Main Authors: Ren, Jing, Wang, Shurong, Xia, Jianxing, Li, Chengbo, Xie, Lisha, He, Hongcai, Niu, Xiaobin, Zhao, Qiang, Hao, Feng
Format: Article
Language:English
Subjects:
Carboxyl group
Carrier recombination
Control equipment
Control stability
Crystal defects
Crystal growth
Current carriers
Density functional theory
Energy conversion efficiency
Energy dissipation
Fourier transforms
Grain size
Infrared spectroscopy
Passivity
Perovskites
Photoelectrons
Photovoltaic cells
Solar cells
Spectrum analysis
Vitamin B
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Summary:Defects, inevitably produced in solution-processed halide perovskite films, can act as charge carrier recombination centers to induce severe energy loss in perovskite solar cells (PSCs). Suppressing these trap states has been regarded as one of the effective strategies to improve the photovoltaic performance and stability of PSCs. Herein, a small molecule of 3-picolinic acid, a commodity chemical with a carboxyl group (-COOH) better known by its common name niacin, which can be chemically anchored to methylammonium lead iodide (MAPbI 3 ) through the coordination effect, is introduced to passivate the defects and control the perovskite crystal growth. Highly crystalline perovskite films with a large grain size are obtained. The passivation within the perovskite via the interaction of -COOH in niacin with Pb 2+ is verified by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, as well as density functional theory calculations. Consequently, the device with niacin achieved a power conversion efficiency close to 20%, along with much more enhanced air and ultraviolet illumination stability, compared to the control device. 3-Picolinic acid (niacin) is utilized to coordinate with Pb 2+ , passivate the defects and control the perovskite crystal growth. The resulting device achieved a PCE close to 20%, along with improved air and ultraviolet illumination stability.
ISSN:2050-7526
2050-7534
DOI:10.1039/d1tc00886b