浅析有机金属卤化物钙钛矿太阳能电池稳定性的研究

doi:10.11896/j.issn.1005-023X.2018.13.003

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Abstract The organicmetal halide perovskite solar cells has been developing rapidly in recent years, and the cells’ certified photoelectric conversion efficiency has reached 22.1%. Simultaneously, low cost, short energy payback time and other merits have made the commercial application of organicmetal halide perovskite solar cells into reality. Nevertheless, the perovskite itself is not stable in the circumstances of high humidity, high temperature or light. Especially, the instability of perovskite will be more serious when assembled with other functional layers into the device, because electrode corrosion or deep defects will be easily initiated in this situation. More and more literature has reported various methods to improve the stability of the device, which mainly focuses on two aspects: Ⅰ. controlling the composition of the perovskite material to enhance the stability; Ⅱ. optimizing the device structure of the solar cells to enhance the stability. As for the component optimization, researchers put efforts in modifying ABX₃ structure, controlling structural dimension and the use of protective layer to improve the stability of perovskite materials themselves. Ⅰ. With the satisfaction of the requirements of Goldschmidt tolerance factor t or octahedral factor μ, the introduction of hydrophobic or temperature-resistant groups like formamidinium or cesium cation into the A site of ABX₃, while incorporation of bromide anion or thiocyanate ion into X site will increase the moisture resistance of perovskite material. What’s more, a combination sites of perovskite Cs_x(MA_0.17FA_0.83)_(100-x)Pb(I_0.83Br_0.17)₃ could not only improve the thermal stability but also enhance the device’s conversion efficiency to 21.1%. Ⅱ. Low-dimensional (mainly two-dimensional) perovskite materials have also been comprehensively studied. For instance, BA_0.05(FA_0.83Cs_0.17)_0.95Pb(I_0.8-Br_0.2)₃displays excellent stability in high humidity and light circumstances. Ⅲ. Protective layers with favorable hydrophobic properties, excellent charge transport ability such as butylphosphonic acid 4-ammonium chloride or benzylamine can also enhance the stabi-lity of the perovskite material. As for the device structure optimization, researchers have tried to strengthen the stability of the device through changing electron transporting material (SnO₂, La-doped BaSnO₃, etc.), hole transporting material (CuGaO₂, CuPC etc.) and counter electrode (carbon, copper etc.), respectively. For example, La-doped BaSO₃ has weak UV photocatalytic activity, excellent electron mobility and suitable energy band structure, the device with La-doped BaSO₃ as electron transporting material show unexceptionable light stability. In addition, taking chemical and thermal stable CuPC as the hole transporting material of the device could not only achieve favorable thermal stability but also obtain a conversion efficiency of 17.5%. Considering the counter electrode, carbon electrode shows excellent stability under high humidity and light conditions when it applies to large area devices. Moreover, when copper electrode replace gold or silver electrode, the device acquired a conversion efficiency of more than 20%, and presented an admirable heat and light stability as well. This review mainly summarizes the current status of the stability study of organometallic halide perovskite solar cells in view of the perovskite absorbing material compositions and device structure. Researches about optimizing the stability of the device from the perovskite composition of ABX₃, structural dimension of perovskite material and the use of other functional layers are summarized. Finally, the development trends of organometallic halide perovskite solar cells are proposed based on the available research.

Key words： organicmetal halide perovskite solar cell stability component optimization device optimization

Published: 01 August 2018

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TM914.4+2

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	CHEN Jian
	MIU Weifeng
	WANG Jilin
	ZHENG Guoyuan
	LONG Fei

Cite this article:

CHEN Jian,MIU Weifeng,WANG Jilin, et al. A Brief Survey on the Stability Study of Organometal Halide Perovskite Solar Cells[J]. Materials Reports, 2018, 32(13): 2151-2160.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.13.003 OR http://www.mater-rep.com/EN/Y2018/V32/I13/2151

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