Hysteresis Analysis Based on the Ferroelectric Effect in Hybrid Perovskite Solar Cells

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• 作者：Jing Wei ; Yicheng Zhao ; Heng Li ; Guobao Li ; Jinlong Pan ; Dongsheng Xu ; Qing Zhao ; Dapeng Yu
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2014
• 出版时间：November 6, 2014
• 年：2014
• 卷：5
• 期：21
• 页码：3937-3945
• 全文大小：550K
• ISSN：1948-7185

文摘

The power conversion efficiency (PCE) of CH₃NH₃PbX₃ (X = I, Br, Cl) perovskite solar cells has been developed rapidly from 6.5 to 18% within 3 years. However, the anomalous hysteresis found in I鈥?i>V measurements can cause an inaccurate estimation of the efficiency. We attribute the phenomena to the ferroelectric effect and build a model based on the ferroelectric diode to explain it. The ferroelectric effect of CH₃NH₃PbI_3鈥?i>xCl_x is strongly suggested by characterization methods and the E鈥?i>P (electrical field鈥損olarization) loop. The hysteresis in I鈥?i>V curves is found to greatly depend on the scan range as well as the velocity, which is well explained by the ferroelectric diode model. We also find that the current signals show exponential decay in 鈭?0 s under prolonged stepwise measurements, and the anomalous hysteresis disappears using these stabilized current values. The experimental results accord well with the model based on ferroelectric properties and prove that prolonged stepwise measurement is an effective way to evaluate the real efficiency of perovskite solar cells. Most importantly, this work provides a meaningful perspective that the ferroelectric effect (if it really exists) should be paid special attention in the optimization of perovskite solar cells.

Keywords:

perovskite; solar cells; photovoltaic; hysteresis; ferroelectric