J. Semicond. > 2016, Volume 37?>?Issue 7?> 072003

SEMICONDUCTOR PHYSICS

Effects of defect states on the performance of perovskite solar cells

Fengjuan Si, Fuling Tang, Hongtao Xue and Rongfei Qi

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Abstract: We built an ideal perovskite solar cell model and investigated the effects of defect states on the solar cell's performance. The verities of defect states with a different energy level in the band gap and those in the absorption layer CH3NH3PbI3 (MAPbI3), the interface between the buffer layer/MAPbI3, and the interface between the hole transport material (HTM) and MAPbI3, were studied. We have quantitatively analyzed these effects on perovskite solar cells' performance parameters. They are open-circuit voltage, short-circuit current, fill factor, and photoelectric conversion efficiency. We found that the performances of perovskite solar cells change worse with defect state density increasing, but when defect state density is lower than 1016 cm-3, the effects are small. Defect states in the absorption layer have much larger effects than those in the adjacent interface layers. The perovskite solar cells have better performance as its working temperature is reduced. When the thickness of MAPbI3 is about 0.3 μm, perovskite solar cells show better comprehensive performance, while the thickness 0.05 μm for Spiro-OMeTAD is enough.

Key words: device modeling, defect states, perovskite solar cells



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Fig. 1.  (Color online) The change of the (a) $V_{\rm oc}$ as well as (b) $J_{\rm sc}$ versus the defect state density in MAPbI$_{3}$. The insert Figure 1(a) is the typical structure model of a perovskite solar cell.

Fig. 2.  (Color online) The change of the (a) FF and (b) $E_{\mathrm{ffi}}$ versus the defect state density in MAPbI$_{3}$.

Fig. 3.  (Color online) The change of the (a) $V_{\mathrm{oc}}$ and (b) $J_{\mathrm{sc}}$ versus the defect state density in IDL1.

Fig. 4.  (Color online) The change of the (a) FF as well as (b) $E_{\mathrm{ffi}}$ versus the defect state density in IDL1.

Fig. 5.  (Color online) The change of the (a) $V_{\mathrm{oc}}$ and (b) $J_{\mathrm{sc}}$ versus the defect state density in IDL2.

Fig. 6.  (Color online) The change of the (a) FF as well as (b) $E_{\mathrm{ffi}}$ versus the defect state density in IDL2.

Fig. 7.  The change of the (a) $V_{\mathrm{oc}}$, (b) $J_{\mathrm{sc}}$, (c) FF as well as (d) $E_{\mathrm{ffi}}$ versus temperature ($T$).

Fig. 8.  (Color online) The change of the (a) $V_{\rm oc}$ and (b) $J_{\mathrm{sc}}$ versus the thickness of MAPbI$_{3}$ and Spiro-OMeTAD layers.

Fig. 9.  (Color online) The change of the (a) FF and (b) $E_{\mathrm{ffi}}$ versus the thickness of MAPbI$_{3}$ and Spiro-OMeTAD layers.

Table 1.   Parameters of device simulation.

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    History

    Received: 08 November 2015 Revised: 30 December 2015 Online: Published: 01 July 2016

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      Fengjuan Si, Fuling Tang, Hongtao Xue, Rongfei Qi. Effects of defect states on the performance of perovskite solar cells[J]. Journal of Semiconductors, 2016, 37(7): 072003. doi: 10.1088/1674-4926/37/7/072003 ****F J Si, F L Tang, H T Xue, R F Qi. Effects of defect states on the performance of perovskite solar cells[J]. J. Semicond., 2016, 37(7): 072003. doi: 10.1088/1674-4926/37/7/072003.
      Citation:
      Fengjuan Si, Fuling Tang, Hongtao Xue, Rongfei Qi. Effects of defect states on the performance of perovskite solar cells[J]. Journal of Semiconductors, 2016, 37(7): 072003. doi: 10.1088/1674-4926/37/7/072003 ****
      F J Si, F L Tang, H T Xue, R F Qi. Effects of defect states on the performance of perovskite solar cells[J]. J. Semicond., 2016, 37(7): 072003. doi: 10.1088/1674-4926/37/7/072003.

      Effects of defect states on the performance of perovskite solar cells

      DOI: 10.1088/1674-4926/37/7/072003
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      • Corresponding author: Email: tfl03@mails.tsinghua.edu.cn
      • Received Date: 2015-11-08
      • Revised Date: 2015-12-30
      • Published Date: 2016-07-25

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