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Amorphous polymer with C=O to improve the performance of perovskite solar cells


Morphology and crystallinity of perovskite layer are crucial for power conversion efficiency (PCE) of the perovskite solar cells (PSCs). Here, we introduced amorphous polymer Polyvinylpyrrolidone (PVP) with C=O functional group into the CH3NH3PbI3-xClx perovskite precursor to tune the morphology and the crystallinity of perovskite layer during the film formation process. The spreading amorphous polymer chains and excellent hygroscopicity of PVP can help the perovskite precursor better contact with the substrate, leading to better perovskite film coverage. More importantly, the electron pair existed in the oxygen atom of the C=O bond in PVP has a strong attraction to Pb(II) ions, which can adjust the location of the nuclei and make the nuclei distribute uniformly in PVP chains, contributing to a uniform and compact perovskite layer. As a result, perovskite films with PVP presents favourable morphology and improved crystallinity. The performance of CH3NH3PbI3-xClx-based perovskite solar cell with optimized PVP content achieves a summit PCE of 16.57% with photovoltage of 1057 mV, short circuit current density of 21.38 mA cm-2, and fill facter FF of 74.52% under standard AM 1.5 solar light of 100 mW cm-2 intensities, which demonstrates a 23.9% increment compared with the PCE of 13.37% of the original device.

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Publication details

The article was received on 01 Jul 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017

Article type: Paper
DOI: 10.1039/C7TC02954C
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Amorphous polymer with C=O to improve the performance of perovskite solar cells

    Y. Zhang, X. Zhuang, K. zhou, C. cai, Z. Hu, J. Zhang and Y. Zhu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02954C

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