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Performance Limitat...
Performance Limitations of Wide-Gap (Ag,Cu)(In,Ga)Se2 Thin-Film Solar Cells
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- Keller, Jan (author)
- Uppsala universitet,Solcellsteknik,Fasta tillståndets elektronik
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- Pearson, Patrick (author)
- Uppsala universitet,Solcellsteknik
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- Shariati Nilsson, Nina (author)
- Uppsala universitet,Solcellsteknik
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- Stolt, Olof (author)
- Uppsala universitet,Solcellsteknik
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- Stolt, Lars (author)
- Uppsala universitet,Solcellsteknik
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- Edoff, Marika, 1965- (author)
- Uppsala universitet,Solcellsteknik
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(creator_code:org_t)
- 2021-07-20
- 2021
- English.
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In: Solar RRL. - : John Wiley & Sons. - 2367-198X. ; 5:9
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Abstract
Subject headings
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- The effect of absorber stoichiometry in (Ag,Cu)(In,Ga)Se2(ACIGS) solar cells withbandgaps (Eg) > 1.40 eV is studied on a large sample set. It is conrmed thatmoving away in composition from ternary AgGaSe2by simultaneous reduction inGa and Ag content widens the chalcopyrite single-phase region and therebyreduces the amount of ordered vacancy compounds (OVCs). As a consequence, adistortion in currentvoltage characteristics, ascribed to OVCs at the back contact,can be successfully avoided. A clear anticorrelation between open-circuit voltage(VOC) and short-circuit current density (JSC) is detected with varying absorberstoichiometry, showing decreasingVOCand increasingJSCvalues for [I]/[III] > 0.9.Capacitance proling reveals that the absorber doping gradually decreases towardstoichiometric composition, eventually leading to complete depletion. It isobserved that only such fully depleted samples exhibit perfect carrier collection,evidencing a very low diffusion length in wide-gap ACIGS lms. The results indicatethat OVCs at the surface play a minor or passive role for device performance.Finally, a solar cell withVOC¼ 0.916 V atEg¼ 1.46 eV is measured, which is, to thebest of our knowledge, the highest value reported for this bandgap to date.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- (Ag
- Cu)(In
- Ga)Se 2
- Cu(In
- Ga)Se 2
- ordered vacancy compounds
- stoichiometry
- wide-gap chalcopyrites
Publication and Content Type
- ref (subject category)
- art (subject category)
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