Point defects, compositional fluctuations, and secondary phases in non-stoichiometric kesterites

Schorr, Susan; Gurieva, Galina; Guc, Maxim; Dimitrievska, Mirjana; Pérez-Rodríguez, Alejandro; Izquierdo-Roca, Victor; Schnohr, Claudia S.; Kim, Juran; Jo, William; Merino, José Manuel

doi:10.1088/2515-7655/ab4a25

Title: Point defects, compositional fluctuations, and secondary phases in non-stoichiometric kesterites

Journal Article · Tue Dec 10 00:00:00 EST 2019 · JPhys Energy

DOI:https://doi.org/10.1088/2515-7655/ab4a25· OSTI ID:1571901

^[1];

^[2];

^[3];

^[4]; Pérez-Rodríguez, Alejandro ^[5]; Izquierdo-Roca, Victor ^[6];

^[7]; Kim, Juran ^[8];

^[8];

^[9]

Helmholtz-Zentrum Berlin fuer Materialien und Energie, Berlin (Germany); Freie Univ. Berlin (Germany)
Helmholtz-Zentrum Berlin fuer Materialien und Energie, Berlin (Germany)
Catalonia Inst. for Energy Research (IREC), Saint Adria de Besos (Spain); Inst. of Applied Physics, Chisinau (Moldova)
Catalonia Inst. for Energy Research (IREC), Saint Adria de Besos (Spain); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Catalonia Inst. for Energy Research (IREC), Saint Adria de Besos (Spain); Univ. de Barcelona, Barcelona (Spain)
Catalonia Inst. for Energy Research (IREC), Saint Adria de Besos (Spain)
Leipzig Univ. (Germany)
Ewha Womans Univ., Seoul (Korea)
Univ. Autonóma de Madrid (Spain)

The efficiency of kesterite-based solar cells is limited by various non-ideal recombination paths, amongst other by a high density of defect states and by the presence of binary or ternary secondary phases within the absorber layer. Pronounced compositional variations and secondary phase segregations are indeed typical features of non-stoichiometric kesterite materials. Certainly kesterite-based thin film solar cells with an off-stoichiometric absorber layer composition, especially Cu-poor/Zn-rich, achieved the highest efficiencies, but deviations from the stoichiometric composition lead to the formation of intrinsic point defects (vacancies, anti-sites, and interstitials) in the kesterite-type material. In addition, a non-stoichiometric composition is usually associated with the formation of undesirable side-phase (secondary phases). Thus the correlation between off-stoichiometry and intrinsic point defects as well as the identification and quantification of secondary phases and compositional fluctuations in non-stoichiometric kesterite materials is of great importance for the understanding and rational design of solar cell devices. Here, this paper summarizes the latest achievements in the investigation of identification and quantification of intrinsic point defects, compositional fluctuations and secondary phases in non-stoichiometric kesterite-type materials.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office (HFTO); Spanish Ministry of Science; Innovation and Universities by WINCOST; European Regional Development Funds

Grant/Contract Number:: AC36-08GO28308; H2020-MSCA-RISE-2017-777968; ENE2016-80788-C5-1-R

OSTI ID:: 1571901

Report Number(s):: NREL/JA-5900-75240

Journal Information:: JPhys Energy, Vol. 2, Issue 1; ISSN 2515-7655

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
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kesterites
solar cells
defect states
point defects
stoichiometry deviations
secondary phases
diffraction
Raman spectroscopy
Kelvin probe forcemicroscopy

Title: Point defects, compositional fluctuations, and secondary phases in non-stoichiometric kesterites

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