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Copper-copper iodide hybrid nanostructure as hole transport material for efficient and stable inverted perovskite solar cells

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  • ReceivedSep 21, 2018
  • AcceptedNov 21, 2018
  • PublishedJan 7, 2019

Abstract

A CuI coated Cu hybrid nanostructure by partial iodation of Cu nanowires was used as hole transport material (HTM) to enhance the charge transfer in inverted perovskite solar cells (PSCs). The outer CuI achieved efficient charge extraction, and the inner copper facilitated the extracted charges to be rapidly transferred, further improving the overall cell performance. Furthermore, we employed a mixture of [6,6]-phenyl-C71-butyric acid methyl ester (PCBM) and ZnO nanoparticles as electron transport material (ETM) to achieve the fabrication of stable PSCs. The best efficiency was up to 18.8%. This work represents a fundamental clue for the design of efficient and stable PSCs using the chemical in-situ construction strategy for HTM and integration of PCBM and ZnO as ETM.


Funded by

the National Natural Science Foundation of China(21801104,21871121,21471071,21431002,21805232)

and the Fundamental Research Funds for the Central Universities of China(lzujbky-2018-k08,lzujbky-2018-ot01,20720180061)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (21801104, 21871121, 21471071, 21431002, 21805232), and the Fundamental Research Funds for the Central Universities of China (lzujbky-2018-k08, lzujbky-2018-ot01, 20720180061).


Interest statement

The authors declare that they have no conflict of interest.


Supplement

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    (a) Diagram for preparation of Cu@CuI hybrid nanowires in ethanol solution; SEM images of (b) Cu NWs and (c) as-treated Cu@CuI on silicon wafer; (d) HAADF-STEM image and elemental maps of a Cu@CuI nanowire (color online).

  • Figure 2

    SEM images (a, b) and XRD patterns (c, d) of Cu NWs (a, c) and Cu@CuI (b, d) on FTO substrates (color online).

  • Figure 3

    (a) Cross-sectional SEM image of an inverted PSC with Cu@CuI as HTM and PCBM as ETM; (b) best J-V data and (c) histograms of cell efficiencies among 30 cells of PSCs with various HTMs; (d) stability of PSCs with PCBM as ETM and various HTMs stored in air at room temperature with a humidity of about 45% (color online).

  • Figure 4

    (a) Schematic structure, (b) cross-sectional SEM image, (c) best J-V data and (d) stability of an inverted PSC device with Cu@CuI as HTM and the mixture of PCBM and ZnO and only PCBM as ETM stored in air at room temperature with a humidity of about 45% (color online).

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