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Supporting Data: Nanometre-scale optical property fluctuations in Cu2ZnSnS4 revealed by low temperature cathodoluminescence Open Access

Band tailing is a major contributing factor to the large open circuit voltage (Voc) deficit that is currently limiting Cu2ZnSnS4 (CZTS) photovoltaic devices. It occurs in highly doped, highly compensated semiconductors and gives rise to a non-uniform electronic band structure. Here we report spatially resolved fluctuations in CZTS optical properties using low temperature cathodoluminescence (CL) in a scanning electron microscope (SEM). Principal component analysis reveals three CL peaks whose relative intensity vary across domains ~100 nm in size. It is not known whether the non-uniform optical properties are due to changes in composition or due to structural order-disorder at constant composition. Measurement of composition with energy dispersive X-ray (EDX) analysis in an SEM and ordering with Micro-Raman mapping revealed CZTS to be uniform within the spatial resolution (estimated at ~0.4 m and 1.1 μm respectively) and sensitivity of the two techniques. The CL results are consistent with the presence of band tailing in CZTS.

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Contributors

Creator: Mendis, Budhika ¹
Contact person: Mendis, Budhika ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Use of low temperature cathodoluminescence in the SEM to detect optical property fluctuations in kesterite over ~100 nm size domains

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ark:/32150/r147429912z
doi:10.15128/r147429912z

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All rights reserved All rights reserved

Publisher

Durham University

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B.G. Mendis

Date Uploaded

25 May 2017, 11:05:04

Date Modified

24 August 2017, 15:08:06

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File format: zip (ZIP Format)

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File size: 149914714

Last modified: 2017:05:25 12:18:53+01:00

Filename: Supporting Data Nanometre scale optical property fluctuations BGM 2017.zip

Original checksum: cce78d38b9d073e715d4a15f24b4fed3