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On the thermal degradation of tunnel diodes in multijunction solar cells

Rey-Stolle, Ignacio; García, Iván; Barrigón, Enrique LU ; Olea, Javier; Pastor, David; Ochoa, Mario; Barrutia Poncela, Laura; Algora, Carlos and Walukiewicz, Wladek (2017) 13th International Conference on Concentrator Photovoltaic Systems, CPV 2017 In 13th International Conference on Concentrator Photovoltaic Systems, CPV 2017 1881.
Abstract

Tunnel junctions are essential components of multijunction solar cells. These highly doped p/n junctions provide the electrical interconnect between the subcells that constitute a multijunction solar cell device. The conductivity and the peak tunneling current of tunnel diodes are known to be severely affected by thermal load. This is a general phenomenon observed in tunnel junctions despite the materials used, the dopants employed or the growth technique applied. Despite this generality, the explanations for this thermal degradation tend to be quite material/dopant specific. On the contrary, in this work we apply the amphoteric native defect model to explain this issue. In this context, the degradation can be explained as a consequence... (More)

Tunnel junctions are essential components of multijunction solar cells. These highly doped p/n junctions provide the electrical interconnect between the subcells that constitute a multijunction solar cell device. The conductivity and the peak tunneling current of tunnel diodes are known to be severely affected by thermal load. This is a general phenomenon observed in tunnel junctions despite the materials used, the dopants employed or the growth technique applied. Despite this generality, the explanations for this thermal degradation tend to be quite material/dopant specific. On the contrary, in this work we apply the amphoteric native defect model to explain this issue. In this context, the degradation can be explained as a consequence of the net loss of free carrier concentration produced by the creation of native compensating defects in the highly doped layers of the tunnel junction. Experiments carried out on n++ GaAs agree well with the model.

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publication status
published
subject
in
13th International Conference on Concentrator Photovoltaic Systems, CPV 2017
volume
1881
publisher
American Institute of Physics Inc.
conference name
13th International Conference on Concentrator Photovoltaic Systems, CPV 2017
external identifiers
  • scopus:85029571940
  • wos:000417352800028
ISBN
9780735415614
DOI
10.1063/1.5001427
language
English
LU publication?
yes
id
58987564-3e5a-41f2-a9c8-57005201c52d
date added to LUP
2017-10-02 12:27:57
date last changed
2018-01-16 13:20:11
@inproceedings{58987564-3e5a-41f2-a9c8-57005201c52d,
  abstract     = {<p>Tunnel junctions are essential components of multijunction solar cells. These highly doped p/n junctions provide the electrical interconnect between the subcells that constitute a multijunction solar cell device. The conductivity and the peak tunneling current of tunnel diodes are known to be severely affected by thermal load. This is a general phenomenon observed in tunnel junctions despite the materials used, the dopants employed or the growth technique applied. Despite this generality, the explanations for this thermal degradation tend to be quite material/dopant specific. On the contrary, in this work we apply the amphoteric native defect model to explain this issue. In this context, the degradation can be explained as a consequence of the net loss of free carrier concentration produced by the creation of native compensating defects in the highly doped layers of the tunnel junction. Experiments carried out on n<sup>++</sup> GaAs agree well with the model.</p>},
  author       = {Rey-Stolle, Ignacio and García, Iván and Barrigón, Enrique and Olea, Javier and Pastor, David and Ochoa, Mario and Barrutia Poncela, Laura and Algora, Carlos and Walukiewicz, Wladek},
  booktitle    = {13th International Conference on Concentrator Photovoltaic Systems, CPV 2017},
  isbn         = {9780735415614},
  language     = {eng},
  month        = {09},
  publisher    = {American Institute of Physics Inc.},
  title        = {On the thermal degradation of tunnel diodes in multijunction solar cells},
  url          = {http://dx.doi.org/10.1063/1.5001427},
  volume       = {1881},
  year         = {2017},
}