Assignment of capacitance spectroscopy signals of CIGS solar cells to effects of non-ohmic contacts

We report evidence for the identification of the capacitance transients detected at room temperature for thin-film photovoltaic cells with CIGS absorbers as an additional non-ohmic contact in the structure with a time constant larger than that of the solar cell p–n junction. The N1 signal was recent...

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Vydané v:	Solar energy materials and solar cells Ročník 112; s. 78 - 83
Hlavní autori:	Lauwaert, Johan, Van Puyvelde, Lisanne, Lauwaert, Jeroen, Thybaut, Joris W., Khelifi, Samira, Burgelman, Marc, Pianezzi, Fabian, Tiwari, Ayodhya N., Vrielinck, Henk
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Amsterdam Elsevier B.V 01.05.2013 Elsevier
Predmet:	Applied sciences Capacitance Capacitance spectroscopy CIGS CIGS solar cells Differential equations Direct energy conversion and energy accumulation Electrical engineering. Electrical power engineering Electrical power engineering Energy Exact sciences and technology MATHEMATICAL ANALYSIS Mathematical models Natural energy Photoelectric conversion Photovoltaic cells Photovoltaic conversion Solar cells Solar cells. Photoelectrochemical cells Solar energy Spectroscopy THIN FILMS Time constant Capacitance spectroscopy CIGS solar cells Cadmium sulfide solar cells Ohmic contact Absorbent material RC circuit Differential equation p n junction Numerical method Electrical model Modeling Molybdenum Solar cell Direct method Time dependence Thin film cell Capacitance Zinc oxide Time constant Room temperature
ISSN:	0927-0248, 1879-3398
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Abstract	We report evidence for the identification of the capacitance transients detected at room temperature for thin-film photovoltaic cells with CIGS absorbers as an additional non-ohmic contact in the structure with a time constant larger than that of the solar cell p–n junction. The N1 signal was recently interpreted as a back contact barrier for which the RC-like time constant is smaller than the time constant of the junction. In this work we unite these experimental observations in one model. Since for a Mo/CIGS/CdS/ZnO solar cell several interfaces are connected in series, we introduce the idea of modeling capacitance spectroscopy signals based on RC-circuits in series for each interface. It is shown that the distinct features observed in capacitance spectroscopy of CIGS solar cells can be mimicked using this circuit as an electrical model. The differential equation for this structure as a function of time is solved numerically. It is inherent to the model that the transients in such a structure are voltage transients over each of the interfaces and that the transients are coupled. These findings question the practical use of capacitance spectroscopy for direct measurement of defects in the absorber layer. ► We show that the transients at room temperature in CIGS originate from an RC-contact. ► We model DLTS and AS signals based on RC-circuits. ► We question the use of DLTS or AS for direct observation of defects.
AbstractList	We report evidence for the identification of the capacitance transients detected at room temperature for thin-film photovoltaic cells with CIGS absorbers as an additional non-ohmic contact in the structure with a time constant larger than that of the solar cell p–n junction. The N1 signal was recently interpreted as a back contact barrier for which the RC-like time constant is smaller than the time constant of the junction. In this work we unite these experimental observations in one model. Since for a Mo/CIGS/CdS/ZnO solar cell several interfaces are connected in series, we introduce the idea of modeling capacitance spectroscopy signals based on RC-circuits in series for each interface. It is shown that the distinct features observed in capacitance spectroscopy of CIGS solar cells can be mimicked using this circuit as an electrical model. The differential equation for this structure as a function of time is solved numerically. It is inherent to the model that the transients in such a structure are voltage transients over each of the interfaces and that the transients are coupled. These findings question the practical use of capacitance spectroscopy for direct measurement of defects in the absorber layer. ► We show that the transients at room temperature in CIGS originate from an RC-contact. ► We model DLTS and AS signals based on RC-circuits. ► We question the use of DLTS or AS for direct observation of defects. We report evidence for the identification of the capacitance transients detected at room temperature for thin-film photovoltaic cells with CIGS absorbers as an additional non-ohmic contact in the structure with a time constant larger than that of the solar cell pan junction. The N1 signal was recently interpreted as a back contact barrier for which the RC-like time constant is smaller than the time constant of the junction. In this work we unite these experimental observations in one model. Since for a Mo/CIGS/CdS/ZnO solar cell several interfaces are connected in series, we introduce the idea of modeling capacitance spectroscopy signals based on RC-circuits in series for each interface. It is shown that the distinct features observed in capacitance spectroscopy of CIGS solar cells can be mimicked using this circuit as an electrical model. The differential equation for this structure as a function of time is solved numerically. It is inherent to the model that the transients in such a structure are voltage transients over each of the interfaces and that the transients are coupled. These findings question the practical use of capacitance spectroscopy for direct measurement of defects in the absorber layer.
Author	Burgelman, Marc Van Puyvelde, Lisanne Lauwaert, Johan Vrielinck, Henk Thybaut, Joris W. Khelifi, Samira Tiwari, Ayodhya N. Lauwaert, Jeroen Pianezzi, Fabian
Author_xml	– sequence: 1 givenname: Johan surname: Lauwaert fullname: Lauwaert, Johan email: Johan.Lauwaert@UGent.be organization: Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Gent, Belgium – sequence: 2 givenname: Lisanne surname: Van Puyvelde fullname: Van Puyvelde, Lisanne organization: Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Gent, Belgium – sequence: 3 givenname: Jeroen surname: Lauwaert fullname: Lauwaert, Jeroen organization: Laboratory for Chemical Technology (LCT), Ghent University, Krijgslaan 281-S5, 9000 Gent, Belgium – sequence: 4 givenname: Joris W. surname: Thybaut fullname: Thybaut, Joris W. organization: Laboratory for Chemical Technology (LCT), Ghent University, Krijgslaan 281-S5, 9000 Gent, Belgium – sequence: 5 givenname: Samira surname: Khelifi fullname: Khelifi, Samira organization: Department of Electronics and Information Systems (ELIS), Ghent University, St.-Pietersnieuwstraat 41, B-9000 Gent, Belgium – sequence: 6 givenname: Marc surname: Burgelman fullname: Burgelman, Marc organization: Department of Electronics and Information Systems (ELIS), Ghent University, St.-Pietersnieuwstraat 41, B-9000 Gent, Belgium – sequence: 7 givenname: Fabian surname: Pianezzi fullname: Pianezzi, Fabian organization: Laboratory for Thin Films and Photovoltaics, Swiss Federal Laboratories for Materials Science and Technology (Empa), Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland – sequence: 8 givenname: Ayodhya N. surname: Tiwari fullname: Tiwari, Ayodhya N. organization: Laboratory for Thin Films and Photovoltaics, Swiss Federal Laboratories for Materials Science and Technology (Empa), Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland – sequence: 9 givenname: Henk surname: Vrielinck fullname: Vrielinck, Henk organization: Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Gent, Belgium
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Keywords	Capacitance spectroscopy CIGS solar cells Cadmium sulfide solar cells Ohmic contact Absorbent material RC circuit Differential equation p n junction Numerical method Electrical model Modeling Molybdenum Solar cell Direct method Time dependence Thin film cell Capacitance Zinc oxide Time constant Room temperature
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Snippet	We report evidence for the identification of the capacitance transients detected at room temperature for thin-film photovoltaic cells with CIGS absorbers as an...
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SubjectTerms	Applied sciences Capacitance Capacitance spectroscopy CIGS CIGS solar cells Differential equations Direct energy conversion and energy accumulation Electrical engineering. Electrical power engineering Electrical power engineering Energy Exact sciences and technology MATHEMATICAL ANALYSIS Mathematical models Natural energy Photoelectric conversion Photovoltaic cells Photovoltaic conversion Solar cells Solar cells. Photoelectrochemical cells Solar energy Spectroscopy THIN FILMS Time constant
Title	Assignment of capacitance spectroscopy signals of CIGS solar cells to effects of non-ohmic contacts
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