Point defect segregation and its role in the detrimental nature of Frank partials in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mrow><mml:mrow><mml:mi>Cu</mml:mi><mml:mo>(</mml:mo><mml:mi>In</mml:mi><mml:mo>,</mml:mo><mml:mi>Ga</mml:mi></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
 thin-film absorbers

Sanli, Ekin Simsek; Barragan-Yani, Daniel; Ramasse, Quentin M.; Albe, Karsten; Mainz, Roland; Abou‐Ras, Daniel; Weber, Alfons; Kleebe, Hans‐Joachim; Aken, Peter A. van

doi:10.1103/physrevb.95.195209

Cited by 12 publications

(2 citation statements)

References 30 publications

(28 reference statements)

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“…In contrast, (partial) dislocations were shown to exhibit regions with changes in composition which extend over several nm . At these line defects, strain fields were found to induce substantial outdiffusion of Cu (Cu i defects), probably in order to relax the crystal lattice correspondingly, in addition to In Cu 2+ antisites present in areas under compressive strain . Therefore, in the case of (partial) dislocations, the change in composition results in an extended phase around the dislocation cores of several nm in diameter.…”

Section: Spatial Variations In Composition and Influences On Local Bamentioning

confidence: 96%

Inhomogeneities in Cu(In,Ga)Se₂ Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

et al. 2017

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Inhomogeneities in Cu(In,Ga)Se2 thin films have been reported to lead to band‐gap or electrostatic potential fluctuations, which may reduce the photovoltaic performance of the corresponding solar cells via enhanced recombination. The issue of where these inhomogeneities occur in the Cu(In,Ga)Se2 absorber has so far not been discussed in detail in literature. The present work gives an overview of spatial variations in composition, net doping, and lifetime on various scales, also with respect to their occurrences at interfaces and extended structural defects. Impacts of these spatial variations on the device performance of the corresponding solar cells are discussed. It can be shown that compositional inhomogeneities possibly affecting the device performance are only present at (partial) dislocations and at the Cu(In,Ga)Se2/buffer interface, and that inhomogeneous distributions of excess charges at line/planar defects as well as of net doping concentrations affect considerably the potential landscape within Cu(In,Ga)Se2 thin films.

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Section: Spatial Variations In Composition and Influences On Local Bamentioning

confidence: 96%

Inhomogeneities in Cu(In,Ga)Se₂ Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

et al. 2017

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“…No spectra could be recorded on unetched films and Cu-rich films after weak etching, due to the presence of the conductive Cu-Se phases at the surface. A recent DFT study by Simsek Sanli et al 54 on the effect of Cu In antisites and Cu interstitials in CIS reveals the appearance of states at 270 meV above the valence band maximum and 210 meV below the conduction band minimum, respectively. However, it is not obvious why the population of these two defects would increase upon KCN etching.…”

Section: Optoelectronics Of Cis Metastability Induced By Cyanidementioning

confidence: 99%

Chemical instability at chalcogenide surfaces impacts chalcopyrite devices well beyond the surface

et al. 2020

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The electrical and optoelectronic properties of materials are determined by the chemical potentials of their constituents. The relative density of point defects is thus controlled, allowing to craft microstructure, trap densities and doping levels. Here, we show that the chemical potentials of chalcogenide materials near the edge of their existence region are not only determined during growth but also at room temperature by post-processing. In particular, we study the generation of anion vacancies, which are critical defects in chalcogenide semiconductors and topological insulators. The example of CuInSe 2 photovoltaic semiconductor reveals that single phase material crosses the phase boundary and forms surface secondary phases upon oxidation, thereby creating anion vacancies. The arising metastable point defect population explains a common root cause of performance losses. This study shows how selective defect annihilation is attained with tailored chemical treatments that mitigate anion vacancy formation and improve the performance of CuInSe 2 solar cells.

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Optoelectronic Inactivity of Dislocations in Cu(In,Ga)Se₂ Thin Films

Abou‐Ras

Nikolaeva

Krause

et al. 2021

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High-efficiency Cu(In,Ga)Se 2 (CIGS) thin-film solar cells are based on polycrystalline CIGS absorber layers, which contain grain boundaries, stacking faults, and dislocations. While planar defects in CIGS layers have been investigated extensively, little is still known about the impact of dislocations on optoelectronic properties of CIGS absorbers. Herein, evidence for an optoelectronic inactivity of dislocations in these thin films is given, in contrast to the situation at grain boundaries. This unique behavior is explained by the extensive elemental redistribution detected around dislocation cores, which is connected with the dislocation strain field, probably leading to a shift of defect states toward the band edges.

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Point defect segregation and its role in the detrimental nature of Frank partials in Cu(In,Ga)Se2 thin-film absorbers

Cited by 12 publications

References 30 publications

Inhomogeneities in Cu(In,Ga)Se₂ Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

Inhomogeneities in Cu(In,Ga)Se₂ Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

Chemical instability at chalcogenide surfaces impacts chalcopyrite devices well beyond the surface

Optoelectronic Inactivity of Dislocations in Cu(In,Ga)Se₂ Thin Films

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Point defect segregation and its role in the detrimental nature of Frank partials in Cu(In,Ga)Se2 thin-film absorbers

Cited by 12 publications

References 30 publications

Inhomogeneities in Cu(In,Ga)Se2 Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

Inhomogeneities in Cu(In,Ga)Se2 Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

Chemical instability at chalcogenide surfaces impacts chalcopyrite devices well beyond the surface

Optoelectronic Inactivity of Dislocations in Cu(In,Ga)Se2 Thin Films

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Product

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Inhomogeneities in Cu(In,Ga)Se₂ Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

Inhomogeneities in Cu(In,Ga)Se₂ Thin Films for Solar Cells: Band‐Gap Versus Potential Fluctuations

Optoelectronic Inactivity of Dislocations in Cu(In,Ga)Se₂ Thin Films