中国物理B ›› 2019, Vol. 28 ›› Issue (9): 98802-098802.doi: 10.1088/1674-1056/ab37f3

• SPECIAL TOPIC-110th Anniversary of Lanzhou University • 上一篇    下一篇

The effect of Mn-doped ZnSe passivation layer on the performance of CdS/CdSe quantum dot-sensitized solar cells

Yun-Long Deng(邓云龙), Zhi-Yuan Xu(徐知源), Kai Cai(蔡凯), Fei Ma(马飞), Juan Hou(侯娟), Shang-Long Peng(彭尚龙)   

  1. 1 National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;
    2 College of Science, Key Laboratory of Ecophysics, Department of Physics, Shihezi University, Shihezi 832003, China
  • 收稿日期:2019-05-31 修回日期:2019-07-11 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: Fei Ma, Shang-Long Peng E-mail:maf@lzu.edu.cn;pengshl@lzu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61376011, 61704114, 51402141, and 61604086), the Gansu Provincial Natural Science Foundation, China (Grant No. 17JR5RA198), the Fundamental Research Funds for the Central Universities, China (Grant Nos. lzujbky-2018-119 and lzujbky-2018-ct08), and the Fund from Shenzhen Science and Technology Innovation Committee, China (Grant No. JCYJ20170818155813437), and the Key Areas Scientific and Technological Research Projects in Xinjiang Production and Construction Corps (Grant No. 2018AB004).

The effect of Mn-doped ZnSe passivation layer on the performance of CdS/CdSe quantum dot-sensitized solar cells

Yun-Long Deng(邓云龙)1, Zhi-Yuan Xu(徐知源)1, Kai Cai(蔡凯)1, Fei Ma(马飞)1, Juan Hou(侯娟)2, Shang-Long Peng(彭尚龙)1   

  1. 1 National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;
    2 College of Science, Key Laboratory of Ecophysics, Department of Physics, Shihezi University, Shihezi 832003, China
  • Received:2019-05-31 Revised:2019-07-11 Online:2019-09-05 Published:2019-09-05
  • Contact: Fei Ma, Shang-Long Peng E-mail:maf@lzu.edu.cn;pengshl@lzu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61376011, 61704114, 51402141, and 61604086), the Gansu Provincial Natural Science Foundation, China (Grant No. 17JR5RA198), the Fundamental Research Funds for the Central Universities, China (Grant Nos. lzujbky-2018-119 and lzujbky-2018-ct08), and the Fund from Shenzhen Science and Technology Innovation Committee, China (Grant No. JCYJ20170818155813437), and the Key Areas Scientific and Technological Research Projects in Xinjiang Production and Construction Corps (Grant No. 2018AB004).

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摘要：

ZnSe as a surface passivation layer in quantum dot-sensitized solar cells plays an important role in preventing charge recombination and thus improves the power conversion efficiency (PCE). However, as a wide bandgap semiconductor, ZnSe cannot efficiently absorb and convert long-wavelength light. Doping transition metal ions into ZnSe semiconductors is an effective way to adjust the band gap, such as manganese ions. In this paper, it is found by the method of density functional theory calculation that the valence band of ZnSe moves upward with manganese ions doping, which leads to acceleration of charge separation, wider light absorption range, and enhancing light harvesting. Finally, by using ZnSe doped with manganese ions as the passivation layer, the TiO2/CdS/CdSe co-sensitized solar cell has a PCE of 6.12%, and the PCE of the solar cell increases by 9% compared with the undoped one (5.62%).

关键词: solar cells, passivation layer, manganese ions, doping

Abstract:

ZnSe as a surface passivation layer in quantum dot-sensitized solar cells plays an important role in preventing charge recombination and thus improves the power conversion efficiency (PCE). However, as a wide bandgap semiconductor, ZnSe cannot efficiently absorb and convert long-wavelength light. Doping transition metal ions into ZnSe semiconductors is an effective way to adjust the band gap, such as manganese ions. In this paper, it is found by the method of density functional theory calculation that the valence band of ZnSe moves upward with manganese ions doping, which leads to acceleration of charge separation, wider light absorption range, and enhancing light harvesting. Finally, by using ZnSe doped with manganese ions as the passivation layer, the TiO2/CdS/CdSe co-sensitized solar cell has a PCE of 6.12%, and the PCE of the solar cell increases by 9% compared with the undoped one (5.62%).

Key words: solar cells, passivation layer, manganese ions, doping

中图分类号:  (Efficiency and performance of solar cells)

  • 88.40.hj
88.40.H- (Solar cells (photovoltaics)) 81.07.Ta (Quantum dots)