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  4. Electrical and optical analysis of a spray coated transparent conductive adhesive for two-terminal silicon based tandem solar cells
 
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2019
Conference Paper
Titel

Electrical and optical analysis of a spray coated transparent conductive adhesive for two-terminal silicon based tandem solar cells

Abstract
This work presents the results of the electrical and optical characterization of a new transparent conductive adhesive (TCA) that combines the techniques of spray pyrolysis and a sol-gel like process. This approach is of particular interest since the adhesive itself forms both the electrical and the mechanical interconnection of the bonded sub-cells. The electrical and optical characterization of the developed TCA shows a minimum connecting resistivity of 17 Ocm2 and a simulated reflection at the Si-TCA interface of &#8776; 20%. By coating both substrate surfaces with a TiO2 anti reflection coating (ARC), the reflectance at the Si-TCA interface was successfully reduced down to <5%. The efficiency potential of a glued dual junction device was simulated in dependence of the electrical and optical properties of the TCA. The reported values of 17 Ocm2 connecting resistivity and 20% reflection limit the device efficiency to 22.3% (71% of the maximum achievable efficiency). Reducing the reflection to below 5%, as practically demonstrated in this paper, allows to increase this value to 25.3% (>80% of maximum), while additionally reducing the connecting resistivity to 10 Ocm² or 1 Ocm2 allows for a further increase to 27.3% and 30.0%, respectively.
Author(s)
Heitmann, Ulrike
Fraunhofer-Institut für Solare Energiesysteme ISE
Höhn, Oliver
Fraunhofer-Institut für Solare Energiesysteme ISE
Hauser, Hubert
Fraunhofer-Institut für Solare Energiesysteme ISE
Kluska, Sven
Fraunhofer-Institut für Solare Energiesysteme ISE
Bartsch, Jonas
Fraunhofer-Institut für Solare Energiesysteme ISE
Janz, Stefan
Fraunhofer-Institut für Solare Energiesysteme ISE
Hauptwerk
SiliconPV 2019, the 9th International Conference on Crystalline Silicon Photovoltaics
Project(s)
SiTaSol
SOLGEL-PV
Funder
European Commission EC
Bundesministerium für Wirtschaft und Energie BMWi (Deutschland)
Konferenz
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) 2019
DOI
10.1063/1.5123884
File(s)
N-555840.pdf (1.21 MB)
Language
English
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