J. Semicond. > 2016, Volume 37 > Issue 3 > 033002
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SEMICONDUCTOR MATERIALS

Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells

Jincheng Zhang, Chengwu Shi, Junjun Chen, Chao Ying, Ni Wu and Mao Wang

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 Corresponding author: Zhang Jincheng, Email:zhangjincheng219@163.com

DOI: 10.1088/1674-4926/37/3/033002

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Abstract: The tungsten trioxide(WO3) thin films were firstly prepared by spin-coating-pyrolysis methods using the ammonium metatungstate((NH4)6H2W12O40) DMF/water solution, and successfully applied as the efficient compact layers for the planar perovskite solar cells. The influence of the WO3 film thickness and the rinsing treatment of CH3NH3PbI3 thin film with isopropanol on the photovoltaic performance of the corresponding perovskite solar cells was systematically investigated. The results revealed that the perovskite solar cell with a 62 nm thick WO3 compact layer achieved a photoelectric conversion efficiency of 5.72%, with a short circuit photocurrent density of 17.39 mA/cm2, an open circuit voltage of 0.58 V and a fill factor of 0.57. The photoelectric conversion efficiency was improved from 5.72% to 7.04% by the isopropanol rinsing treatment.

Key words: WO3 thin film, ammonium metatungstate DMF/water solution, pyrolysis, compact layer, perovskite solar cell



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Fig. 1.  The XRD patterns of WO$_{3}$ thin films. (a) WO$_{3}$ (1). (b) WO$_{3}$ (2). (c) WO$_{3}$ (3).

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Fig. 2.  The surface and cross-sectional SEM images of WO$_{3}$ thin films. (a,d) WO$_{3}$ (1). (b,e) WO$_{3}$ (2). (c,f) WO$_{3}$ (3).

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Fig. 3.  UV-vis absorption spectra of WO$_{3}$ thin films. (a) WO$_{3}$ (1). (b) WO$_{3}$ (2). (c) WO$_{3}$ (3).

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Fig. 4.  The XRD patterns of PbI$_{2}$ thin film and MAPbI$_{3}$ thin film on the WO$_{3 }$(2) thin film. (a) PbI$_{2}$ thin film. (b) MAPbI$_{3}$ thin film.

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Fig. 5.  The surface SEM images of PbI$_{2}$ thin film and MAPbI$_{3}$ thin film on the WO$_{3}$ (2) thin film. (a) PbI$_{2}$ thin film. (b) MAPbI$_{3}$ thin film without the rinsing treatment by isopropanol. (c) MAPbI$_{3}$ thin film with the rinsing treatment by isopropanol.

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Fig. 6.  The cross-sectional SEM images of PbI$_{2}$ thin film and MAPbI$_{3}$ thin film on the WO$_{3 }$(2) thin film. (a) PbI$_{2}$ thin film. (b) MAPbI$_{3}$ thin film.

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Fig. 7.  Absorption spectra of PbI$_{2}$ thin film and MAPbI$_{3}$ thin film on the WO$_{3}$(2) thin film. (a) PbI$_{2}$ thin film. (b) MAPbI$_{3}$ thin film.

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Fig. 8.  Photocurrent-photovoltage characteristics of the perovskite solar cells based on WO$_{3}$ thin films. (a) WO$_{3}$ (1) with rinsing. (b) WO$_{3}$ (2) with rinsing. (c) WO$_{3}$ (3) with rinsing. (d) WO$_{3}$ (2) without rinsing.

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Table 1.   The photovoltaic performance parameters of the perovskite solar cells based on WO$_{3}$ thin films.

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    Received: 31 July 2015 Revised: Online: Published: 01 March 2016

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      Article Navigation >  Journal of Semiconductors  > 2016  >  37(3): 033002
      Jincheng Zhang, Chengwu Shi, Junjun Chen, Chao Ying, Ni Wu, Mao Wang. Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells[J]. Journal of Semiconductors, 2016, 37(3): 033002. doi: 10.1088/1674-4926/37/3/033002 ****J C Zhang, C W Shi, J J Chen, C Ying, N Wu, M Wang. Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells[J]. J. Semicond., 2016, 37(3): 033002. doi: 10.1088/1674-4926/37/3/033002.
      Citation:
      Jincheng Zhang, Chengwu Shi, Junjun Chen, Chao Ying, Ni Wu, Mao Wang. Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells[J]. Journal of Semiconductors, 2016, 37(3): 033002. doi: 10.1088/1674-4926/37/3/033002 ****
      J C Zhang, C W Shi, J J Chen, C Ying, N Wu, M Wang. Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells[J]. J. Semicond., 2016, 37(3): 033002. doi: 10.1088/1674-4926/37/3/033002.
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      Pyrolysis preparation of WO3 thin films using ammonium metatungstate DMF/water solution for efficient compact layers in planar perovskite solar cells

      DOI: 10.1088/1674-4926/37/3/033002

      • School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China

      Funds:

      Project supported by the National Natural Science Foundation of China(Nos.51472071, 512720616, 51072043), and the National Basic Research Program of China(No.2011CBA00700).

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      • Corresponding author: Zhang Jincheng, Email:zhangjincheng219@163.com
      • Received Date: 2015-07-31
      • Published Date: 2016-01-25

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