中国物理B ›› 2018, Vol. 27 ›› Issue (12): 127303-127303.doi: 10.1088/1674-1056/27/12/127303

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Enhanced performance of a solar cell based on a layer-by-layer self-assembled luminescence down-shifting layer of core-shell quantum dots

Ni Liu(刘妮), Shu-Xin Li(李淑鑫), Ying-Chun Ye(叶迎春), Yan-Li Yao(姚延立)   

  1. 1 College of Aeronautical Engineering, Binzhou University, Binzhou 256603, China;
    2 Anhui Key Laboratory of Nanomaterials and Technology and Key Laboratory of Materials Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2018-08-06 修回日期:2018-09-17 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: Ni Liu E-mail:liuni106@bzu.edu.cn
  • 基金资助:

    Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2017PF011), the National Natural Science Foundation of China (Grant No. E020701), and the Doctoral Scientific Research Foundation of Binzhou University, China (Grant No. 2014Y10).

Enhanced performance of a solar cell based on a layer-by-layer self-assembled luminescence down-shifting layer of core-shell quantum dots

Ni Liu(刘妮)1, Shu-Xin Li(李淑鑫)2, Ying-Chun Ye(叶迎春)1, Yan-Li Yao(姚延立)1   

  1. 1 College of Aeronautical Engineering, Binzhou University, Binzhou 256603, China;
    2 Anhui Key Laboratory of Nanomaterials and Technology and Key Laboratory of Materials Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2018-08-06 Revised:2018-09-17 Online:2018-12-05 Published:2018-12-05
  • Contact: Ni Liu E-mail:liuni106@bzu.edu.cn
  • Supported by:

    Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2017PF011), the National Natural Science Foundation of China (Grant No. E020701), and the Doctoral Scientific Research Foundation of Binzhou University, China (Grant No. 2014Y10).

摘要:

In this paper, core-shell quantum dots (QDs) with two polar surface functional groups (ZnSe/ZnS-COOH QDs and ZnSe/ZnS-NH2 QDs) are synthesized in an aqueous phase. Photoluminescence (PL) and absorption spectra clearly indicate luminescence down-shifting (LDS) properties. On the basis of QDs, surface functional group multilayer LDS films (M-LDSs) are fabricated through an electrostatic layer-by-layer (LBL) self-assembly method. The PL intensity increases linearly with the number of bilayers, showing a regular and uniform film growth. When the M-LDS is placed on the surface of a Si-based solar cell as an optical conversion layer for the first time, the external quantum efficiency (EQE) and short-circuit current density (Jsc) notably increases for the LDS process. The EQE response improves in a wavelength region extending from the UV region to the blue region, and its maximum increase reaches more than 15% between 350 nm and 460 nm.

关键词: two-surface functional group, LBL self-assembly, LDS

Abstract:

In this paper, core-shell quantum dots (QDs) with two polar surface functional groups (ZnSe/ZnS-COOH QDs and ZnSe/ZnS-NH2 QDs) are synthesized in an aqueous phase. Photoluminescence (PL) and absorption spectra clearly indicate luminescence down-shifting (LDS) properties. On the basis of QDs, surface functional group multilayer LDS films (M-LDSs) are fabricated through an electrostatic layer-by-layer (LBL) self-assembly method. The PL intensity increases linearly with the number of bilayers, showing a regular and uniform film growth. When the M-LDS is placed on the surface of a Si-based solar cell as an optical conversion layer for the first time, the external quantum efficiency (EQE) and short-circuit current density (Jsc) notably increases for the LDS process. The EQE response improves in a wavelength region extending from the UV region to the blue region, and its maximum increase reaches more than 15% between 350 nm and 460 nm.

Key words: two-surface functional group, LBL self-assembly, LDS

中图分类号:  (II-VI semiconductors)

  • 73.61.Ga
73.21.La (Quantum dots) 85.30.-z (Semiconductor devices)