Defect passivation in hybrid perovskite solar cells using quaternary ammonium halide anions and cations

Xiaopeng Zheng, Bo Chen, Jun Dai, Yanjun Fang, Yang Bai, Yuze Lin, Haotong Wei, Xiao Cheng Zeng and Jinsong Huang ()
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Xiaopeng Zheng: University of Nebraska-Lincoln
Bo Chen: University of Nebraska-Lincoln
Jun Dai: University of Nebraska-Lincoln
Yanjun Fang: University of Nebraska-Lincoln
Yang Bai: University of Nebraska-Lincoln
Yuze Lin: University of Nebraska-Lincoln
Haotong Wei: University of Nebraska-Lincoln
Xiao Cheng Zeng: University of Nebraska-Lincoln
Jinsong Huang: University of Nebraska-Lincoln

Nature Energy, 2017, vol. 2, issue 7, 1-9

Abstract: Abstract The ionic defects at the surfaces and grain boundaries of organic–inorganic halide perovskite films are detrimental to both the efficiency and stability of perovskite solar cells. Here, we show that quaternary ammonium halides can effectively passivate ionic defects in several different types of hybrid perovskite with their negative- and positive-charged components. The efficient defect passivation reduces the charge trap density and elongates the carrier recombination lifetime, which is supported by density-function-theory calculation. The defect passivation reduces the open-circuit-voltage deficit of the p–i–n-structured device to 0.39 V, and boosts the efficiency to a certified value of 20.59 ± 0.45%. Moreover, the defect healing also significantly enhances the stability of films in ambient conditions. Our findings provide an avenue for defect passivation to further improve both the efficiency and stability of solar cells.

Date: 2017
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DOI: 10.1038/nenergy.2017.102

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