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2-Terminal CIGS-perovskite tandem cells : A layer by layer exploration

Jacobsson, T. Jesper ; Hultqvist, Adam ; Svanström, Sebastian ; Riekehr, Lars ; Cappel, Ute B. ; Unger, Eva LU ; Rensmo, Håkan ; Johansson, Erik M.J. ; Edoff, Marika and Boschloo, Gerrit (2020) In Solar Energy 207. p.270-288
Abstract

This paper focuses on the development of 2-terminal CIGS-perovskite tandem solar cells by exploring a range of stack sequences and synthetic procedures for depositing the associated layers. In the end, we converged at a stack sequence composed of SLG/Mo/CIGS/CdS/i-ZnO/ZnO:Al/NiO/PTAA/Perovskite/LiF/PCBM/SnO2/ITO. With this architecture, we reached performances only about 1% lower than the corresponding 4-terminal tandem cells, thus demonstrating functional interconnects between the two sub-cells while grown monolithically on top of each other. We go through the stack, layer-by-layer, discussing their deposition and the results, from which we can conclude what works, what does not work, and what potentially could work after... (More)

This paper focuses on the development of 2-terminal CIGS-perovskite tandem solar cells by exploring a range of stack sequences and synthetic procedures for depositing the associated layers. In the end, we converged at a stack sequence composed of SLG/Mo/CIGS/CdS/i-ZnO/ZnO:Al/NiO/PTAA/Perovskite/LiF/PCBM/SnO2/ITO. With this architecture, we reached performances only about 1% lower than the corresponding 4-terminal tandem cells, thus demonstrating functional interconnects between the two sub-cells while grown monolithically on top of each other. We go through the stack, layer-by-layer, discussing their deposition and the results, from which we can conclude what works, what does not work, and what potentially could work after additional modifications. The challenges for a successful 2-terminal tandem device include: how to deal with, or decrease, the surface roughness of the CIGS-stack, how to obtain uniform coverage of the layers between the CIGS and the perovskite while also obtaining a benign interface chemistry, and how to tune the band gaps of both the CIGS and the perovskite to obtain good optical matching. The investigation was based on CIGS with a power conversion efficiency around 14%, and perovskites with an efficiency around 12%, resulting in 2-terminal tandem cells with efficiencies of 15–16%. The results indicate that by using higher performing CIGS and perovskite sub-cells, it should be possible to manufacture highly efficient 2-terminal CIGS-perovskite tandem devices by using the protocols, principles, and procedures developed and discussed in this paper.

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; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
2-terminal, CIGS, Perovskite, Solar cell, Tandem
in
Solar Energy
volume
207
pages
19 pages
publisher
Elsevier
external identifiers
  • scopus:85087509217
ISSN
0038-092X
DOI
10.1016/j.solener.2020.06.034
language
English
LU publication?
yes
id
f310f5ce-6ef6-4920-ae96-7a9e3c038e43
date added to LUP
2021-01-12 15:41:37
date last changed
2023-11-20 20:23:40
@article{f310f5ce-6ef6-4920-ae96-7a9e3c038e43,
  abstract     = {{<p>This paper focuses on the development of 2-terminal CIGS-perovskite tandem solar cells by exploring a range of stack sequences and synthetic procedures for depositing the associated layers. In the end, we converged at a stack sequence composed of SLG/Mo/CIGS/CdS/i-ZnO/ZnO:Al/NiO/PTAA/Perovskite/LiF/PCBM/SnO<sub>2</sub>/ITO. With this architecture, we reached performances only about 1% lower than the corresponding 4-terminal tandem cells, thus demonstrating functional interconnects between the two sub-cells while grown monolithically on top of each other. We go through the stack, layer-by-layer, discussing their deposition and the results, from which we can conclude what works, what does not work, and what potentially could work after additional modifications. The challenges for a successful 2-terminal tandem device include: how to deal with, or decrease, the surface roughness of the CIGS-stack, how to obtain uniform coverage of the layers between the CIGS and the perovskite while also obtaining a benign interface chemistry, and how to tune the band gaps of both the CIGS and the perovskite to obtain good optical matching. The investigation was based on CIGS with a power conversion efficiency around 14%, and perovskites with an efficiency around 12%, resulting in 2-terminal tandem cells with efficiencies of 15–16%. The results indicate that by using higher performing CIGS and perovskite sub-cells, it should be possible to manufacture highly efficient 2-terminal CIGS-perovskite tandem devices by using the protocols, principles, and procedures developed and discussed in this paper.</p>}},
  author       = {{Jacobsson, T. Jesper and Hultqvist, Adam and Svanström, Sebastian and Riekehr, Lars and Cappel, Ute B. and Unger, Eva and Rensmo, Håkan and Johansson, Erik M.J. and Edoff, Marika and Boschloo, Gerrit}},
  issn         = {{0038-092X}},
  keywords     = {{2-terminal; CIGS; Perovskite; Solar cell; Tandem}},
  language     = {{eng}},
  month        = {{09}},
  pages        = {{270--288}},
  publisher    = {{Elsevier}},
  series       = {{Solar Energy}},
  title        = {{2-Terminal CIGS-perovskite tandem cells : A layer by layer exploration}},
  url          = {{http://dx.doi.org/10.1016/j.solener.2020.06.034}},
  doi          = {{10.1016/j.solener.2020.06.034}},
  volume       = {{207}},
  year         = {{2020}},
}