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Photo-stability of CsPbBr3 perovskite quantum dots for optoelectronic application

光电器件用CsPbBr3钙钛矿量子点的光稳定性研究

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Abstract

Due to their superior photoluminescence (PL) quantum yield (QY) and tunable optical band gap, all-inorganic CsPbBr3 perovskite quantum dots (QDs) have attracted intensive attention for the application in solar cells, light emitting diodes (LED), photodetectors and laser devices. In this scenario, the stability of such materials becomes a critical factor to be revealed. We hereby investigated the long-termstability of as-synthesized CsPbBr3 QDs suspended in toluene at various environmental conditions. We found light illumination would induce drastic photo-degradation of CsPbBr3QDs. The steady-state spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) verified that CsPbBr3 QDs tend to aggregate to form larger particles under continuous light soaking. In addition, decreasing PL QY of the QDs during light soaking indicates the formation of trap sites. Our work reveals that the main origin of instability in CsPbBr3 QDs and provides reference to engineer such QDs towards optimal device application.

摘要

全无机CsPbBr3钙钛矿量子点因其优异的发光性能, 而在太阳能电池、发光二极管、光探头和激光器件等应用研究领域受到广泛关注. 基于此, 我们研究了CsPbBr3钙钛矿量子点在不同光照、气氛和温度条件下的稳定性. 光照下, 量子点表面缺陷态的产生和量子点的聚集促使量子点的发光效率降低, 吸收和发光光谱发生红移. 透射电子显微镜和X-光单晶衍射实验结果表明, 在光照下量子点发生了聚集进而形成了大尺寸的晶体. 我们的工作表明光照是影响CsPbBr3钙钛矿量子点稳定性的决定性因素, 因此需要改善其光稳定性从而优化CsPbBr3钙钛矿量子点光电器件性能.

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Authors and Affiliations

  1. Department of Chemical Physics and NanoLund, Lund University, Lund, 22100, Sweden

    Junsheng Chen  (陈俊生) & Kaibo Zheng  (郑凯波)

  2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Junsheng Chen  (陈俊生)

  3. College of Science, Agricultural University of Hebei, Baoding, 071001, China

    Dongzhou Liu  (刘东州)

  4. College of Physics Science & Technology, Hebei University, Baoding, 071002, China

    Dongzhou Liu  (刘东州)

  5. Gas Processing Center, College of Engineering, Qatar University, Doha, Qatar

    Mohammed J. Al-Marri & Kaibo Zheng  (郑凯波)

  6. Department of Physics, Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland

    Lauri Nuuttila & Heli Lehtivuori

Authors
  1. Junsheng Chen  (陈俊生)
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  2. Dongzhou Liu  (刘东州)
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  3. Mohammed J. Al-Marri
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  4. Lauri Nuuttila
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  5. Heli Lehtivuori
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  6. Kaibo Zheng  (郑凯波)
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Corresponding author

Correspondence to Kaibo Zheng  (郑凯波).

Additional information

Junsheng Chen received his BSc degrees in materials physics and management from China University of Petroleum (Huadong) in 2010. Now he is a joint PhD candidate of Lund University and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. His research interests include semiconductor nanocrystals preparation and excited state dynamic processes in semiconductor nanocrystals and organic supramolecules.

Kaibo Zheng received his PhD degree from the Department of Material Science, Fudan University in 2010. He is now a senior researcher at the Division of Chemical Physics, Lund University, Sweden. His research interests include design, structural characterization and ultrafast photo-induced dynamics in nanostructured optoelectronicmaterials such as semiconductor quantum dots, nanowires and perovskite materials.

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Chen, J., Liu, D., Al-Marri, M.J. et al. Photo-stability of CsPbBr3 perovskite quantum dots for optoelectronic application. Sci. China Mater. 59, 719–727 (2016). https://doi.org/10.1007/s40843-016-5123-1

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  • DOI: https://doi.org/10.1007/s40843-016-5123-1

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