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Comparison of Sulfu...
Comparison of Sulfur Incorporation into CuInSe(2)and CuGaSe(2)Thin-Film Solar Absorbers
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- Khavari, Faraz (author)
- Uppsala universitet,Solcellsteknik
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- Keller, Jan (author)
- Uppsala universitet,Solcellsteknik
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- Larsen, Jes K (author)
- Uppsala universitet,Solcellsteknik
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- Sopiha, Kostiantyn (author)
- Uppsala universitet,Solcellsteknik
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- Törndahl, Tobias, 1974- (author)
- Uppsala universitet,Solcellsteknik
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- Edoff, Marika, 1965- (author)
- Uppsala universitet,Solcellsteknik
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(creator_code:org_t)
- 2020-09-29
- 2020
- English.
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In: Physica Status Solidi (a) applications and materials science. - : WILEY-V C H VERLAG GMBH. - 1862-6300 .- 1862-6319. ; 217:22
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Abstract
Subject headings
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- Herein, sulfurization of CuInSe(2)and CuGaSe2(CGSe) absorber layers is compared to improve the understanding of sulfur incorporation into Cu(In,Ga)Se(2)films by annealing in a sulfur atmosphere. It is found for Cu-poor CuInSe(2)that for an annealing temperature of 430 degrees C, sulfur is incorporated into the surface of the absorber and forms an inhomogeneous CuIn(S,Se)(2)layer. In addition, at 530 degrees C, a surface layer of CuInS(2)is formed. In contrast, for Cu-poor CuGaSe(2)samples, S can only be introduced at 530 degrees C, mainly forming an alloy of CuGa(S,Se)(2), where no closed CuGaS(2)layer is found. In Cu-rich CuGaSe(2)samples, however, selenium is substituted by S already at 330 degrees C, which can be explained by a rapid phase transformation of Cu2 - xSe into Cu2 - x(S,Se). This transformation facilitates S in-diffusion and catalyzes CuGa(S,Se)(2)formation, likewise that previously reported to occur in CuInSe2. Finally, the Cu-poor CuInSe(2)solar cell performance is improved by the sulfurization step at 430 degrees C, whereas for the 530 degrees C sample, a decreasing fill factor and short-circuit current density are observed, indicating lower diffusion length accompanied by possible formation of an electron transport barrier. In contrast, the electrical characteristics deteriorate for all sulfurized Cu-poor CuGaSe(2)cells.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- diffusion
- elemental sulfur
- ordered vacancy compounds
- phase transformation
- sulfurization
Publication and Content Type
- ref (subject category)
- art (subject category)
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