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

doi:10.1088/1674-1056/ab37f3

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%).

Keywords: solar cells passivation layer manganese ions doping

Received: 31 May 2019
Revised: 11 July 2019
Accepted manuscript online:

PACS:	88.40.hj	(Efficiency and performance of solar cells)
	88.40.H-	(Solar cells (photovoltaics))
	81.07.Ta	(Quantum dots)

Fund:

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).

Corresponding Authors: Fei Ma, Shang-Long Peng
E-mail: maf@lzu.edu.cn;pengshl@lzu.edu.cn

Cite this article:

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) The effect of Mn-doped ZnSe passivation layer on the performance of CdS/CdSe quantum dot-sensitized solar cells 2019 Chin. Phys. B 28 098802

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

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