Discrepancy between integral and local composition in off-stoichiometric Cu2ZnSnSe4 kesterites: A pitfall for classification

Schoeppe P, Gurieva G, Giraldo S, Martinez-Criado G, Ronning C, Saucedo E, Schorr S, Schnohr CS (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Applied Physics Letters American Institute of Physics (AIP)

Book Volume: 110

Article Number: 043901

Journal Issue: 4

DOI: 10.1063/1.4974819

Abstract

High-efficiency kesterite-based thin film solar cells typically feature Cu-poor, Zn-rich absorbers although secondary phases occur easily in non-stoichiometric Cu2ZnSnSe4. We therefore applied high-resolution X-ray fluorescence analysis using a synchrotron nanobeam to study the local composition of a CZTSe cross section lamella cut from a sample with an integral composition of Zn/Sn = 1.37 and Cu/(Zn+Sn) = 0.55. We find submicrometer-sized ZnSe-, SnSe/SnSe2-, and even CuSe/Cu2Se-like secondary phases, while the local compositions of the kesterite are highly Zn-rich yet barely Cu-poor with 1.5 ≤ Zn/Sn ≤ 2.2 and Cu/(Zn+Sn) ∼ 1.0. Consequently, great care must be taken when relating the integral composition to other material properties including the device performance.

Involved external institutions

Friedrich-Schiller-Universität Jena DE Germany (DE) Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) DE Germany (DE) Catalonia Institute for Energy Research / Institut de Recerca en Energia de Catalunya (IREC) ES Spain (ES) European Synchrotron Radiation Facility (ESRF) FR France (FR)

How to cite

APA:

Schoeppe, P., Gurieva, G., Giraldo, S., Martinez-Criado, G., Ronning, C., Saucedo, E.,... Schnohr, C.S. (2017). Discrepancy between integral and local composition in off-stoichiometric Cu2ZnSnSe4 kesterites: A pitfall for classification. Applied Physics Letters, 110(4). https://doi.org/10.1063/1.4974819

MLA:

Schoeppe, Philipp, et al. "Discrepancy between integral and local composition in off-stoichiometric Cu2ZnSnSe4 kesterites: A pitfall for classification." Applied Physics Letters 110.4 (2017).

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