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Tuning the crystal-growth of perovskite thin-films by adding 2-pyridylthiourea additive for highly efficient and stable solar cells prepared in ambient air

Abstract

Here, we report a rapid and simple process to prepare the perovskite solar cells in ambient air by adding 2-pyridylthiourea in the precursor solution. 2-pyridylthiourea can not only promote the conversion of the 2-D PbI2 to the tetragonal CH3NH3PbI3 crystals, but also improve the quality of the perovskite absorber layer via enhance the uniformity and the size of the crystal grains. The perovskite solar cells with adding 2-pyridylthiourea at the concentration of 0.5 mg mL-1 exhibited a remarkable overall power conversion efficiency (PCE) of 18.2 %, which is among the highest PCE of CH3NH3PbI3-based devices fabricated in ambient air. It also showed an 18 % increase and less hysteresis compared with the cells without additives. Importantly, the devices with 2-pyridylthiourea show relatively better stability compared to reference devices when aged under ambient air of 55±5 % relative humidity in the dark and under 65 oC after 30 days. The presented results clearly qualify that 2-pyridylthiourea can be one of additive candidates for tuning the morphology of perovskite thin-films, which may be a new direction for large-scale production of PSCs.

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Publication details

The article was received on 26 Jan 2017, accepted on 28 Apr 2017 and first published on 29 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA00894E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Tuning the crystal-growth of perovskite thin-films by adding 2-pyridylthiourea additive for highly efficient and stable solar cells prepared in ambient air

    M. Sun, F. Zhang, H. Liu, X. Li, Y. Xiao and S. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA00894E

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