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Issue 21, 2019
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Organic bulk-heterojunction injected perovskite films for highly efficient solar cells

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Abstract

Unsatisfactory light-harvesting over the wavelength of 500 nm is a critical factor limiting the further improvement in efficiency of halide lead based perovskite solar cells (PSCs). Past studies on a tandem strategy of integrating perovskite and bulk-heterojunction (BHJ) increased the fabrication complexity. Here, we developed a convenient strategy, injecting the organic BHJ of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)-carbonyl]-thieno-[3,4-b]thiophenediyl]] (PTB7) and 3,9-bis[2-(3-oxo-2-vinyl-2,3-dihydroinden-1-ylidene)-malononitrile]-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC) via anti-solvent engineering. Besides the function of enhanced light-harvesting in the range of 500–700 nm for the perovskite layer, the BHJ-treated CH3NH3PbI3 films exhibit superior crystalline quality with reduced defect and trap states. As a result, the resulting PSCs deliver a champion power conversion efficiency as high as 20%. The proposed method provides a facile route to integrate perovskite and organic BHJ conveniently by avoiding additional fabrication steps. And this method is suitable for large-scale and industrial production of high-performance PSCs.

Graphical abstract: Organic bulk-heterojunction injected perovskite films for highly efficient solar cells

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Publication details

The article was received on 25 Feb 2019, accepted on 25 Apr 2019 and first published on 29 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC01058K
J. Mater. Chem. C, 2019,7, 6391-6397

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    Organic bulk-heterojunction injected perovskite films for highly efficient solar cells

    K. Hu, Z. Wang, L. Meng, K. Wang, Y. Zhang and L. Liao, J. Mater. Chem. C, 2019, 7, 6391
    DOI: 10.1039/C9TC01058K

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