Jump to main content
Jump to site search

Issue 9, 2019

Cd-Free Cu2ZnSnS4 solar cell with an efficiency greater than 10% enabled by Al2O3 passivation layers

Author affiliations

Abstract

Environmentally friendly earth-abundant Cd-free Cu2ZnSnS4 (CZTS) solar cells have recently achieved increasing power conversion efficiency by using ZnSnO as the buffer layer. However, the large open circuit voltage (Voc) deficit remains the key concern. Here, we report a Cd-free CZTS solar cell that exhibits an energy conversion efficiency of 10.2% resulting from the application of an aluminium oxide (Al2O3) passivation layer prepared by atomic layer deposition (ALD). We found that the application of full ALD cycles as well as trimethylaluminum (TMA) exposures resulted in a significant increase in Voc and relate this to the properties of the CZTS interface. Both processes facilitate the formation of a thicker Cu-deficient nanolayer with a higher concentration of Na and O, forming a homogeneous passivation layer across the CZTS surface. This nanolayer reduces the local potential fluctuation of band edges and leads to the widened electrical band gap and suppressed defects recombination at the heterojunction interface, thus improvement in Voc and device performance. The ability of nanolayers to alter the atomic composition in the near surface region of compound semiconductors might be beneficial for a wider range of semiconductor devices.

Graphical abstract: Cd-Free Cu2ZnSnS4 solar cell with an efficiency greater than 10% enabled by Al2O3 passivation layers

Supplementary files

Article information


Submitted
29 Maijs 2019
Accepted
22 Jūl. 2019
First published
25 Jūl. 2019

Energy Environ. Sci., 2019,12, 2751-2764
Article type
Paper

Cd-Free Cu2ZnSnS4 solar cell with an efficiency greater than 10% enabled by Al2O3 passivation layers

X. Cui, K. Sun, J. Huang, J. S. Yun, C. Lee, C. Yan, H. Sun, Y. Zhang, C. Xue, K. Eder, L. Yang, J. M. Cairney, J. Seidel, N. J. Ekins-Daukes, M. Green, B. Hoex and X. Hao, Energy Environ. Sci., 2019, 12, 2751 DOI: 10.1039/C9EE01726G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements