Issue 11, 2018

Synergistic effects of thiocyanate additive and cesium cations on improving the performance and initial illumination stability of efficient perovskite solar cells

Abstract

Mixed triple-cation (cesium (Cs), methylammonium (MA) and formamidinium (FA)) lead tri-iodide perovskite solar cells (PVSCs) exhibit improved optical and thermal stabilities compared to similar PVSCs without Cs. However, the triple-cation PVSCs still suffer from initial instability under illumination. Here, we report on the improvement of device performance and operational illumination stability of PVSCs via simultaneous incorporation of lead thiocyanate (Pb(SCN)2) additive and Cs cations, which enhances the perovskite crystallinity and lowers the trap density. We systematically investigate the impact of Cs on the device performance of PVSCs and demonstrate stable power conversion efficiencies of up to 20%. Importantly, our PVSCs with Cs and SCN additives sustain maximum power conversion efficiencies of about 19% without noticeable degradation during continuous operation for 20 000 seconds under 100 mW cm−2 AM 1.5G illumination. The excellent illumination stability of our PVSCs is mainly attributed to the reduced defect density and suppressed photodecomposition of the perovskite due to the incorporation of nonvolatile Cs ions.

Graphical abstract: Synergistic effects of thiocyanate additive and cesium cations on improving the performance and initial illumination stability of efficient perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
30 апр 2018
Accepted
14 юли 2018
First published
16 юли 2018

Sustainable Energy Fuels, 2018,2, 2435-2441

Author version available

Synergistic effects of thiocyanate additive and cesium cations on improving the performance and initial illumination stability of efficient perovskite solar cells

C. Wang, Z. Song, Y. Yu, D. Zhao, R. A. Awni, C. R. Grice, N. Shrestha, R. J. Ellingson, X. Zhao and Y. Yan, Sustainable Energy Fuels, 2018, 2, 2435 DOI: 10.1039/C8SE00200B

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

Spotlight

Advertisements