Issue 31, 2018

Halogen-free guanidinium-based perovskite solar cell with enhanced stability

Abstract

Herein, we report a new halogen-free and excellent stable perovskite, GAPb(SCN)3, which was prepared from the symmetric guanidinium cation (GA+) with nearly zero dipole moment, and pseudohalogen (SCN), for the fabrication of stable perovskite solar cells. GAPb(SCN)3 exhibits an orthorhombic crystal phase, with optical band gap of 1.43 eV. The orthorhombic crystal phase shifted to a cubic phase, due to the formation of PbS beyond 150 °C. GAPb(SCN)3 itself showed excellent stability upon being exposed to ambient conditions for 30 days, without degradation of its optical or crystallographic properties. This superior stability could be attributable to the strong electrostatic interaction between SCN and Pb2+, and hydrogen bonding between SCN and GA+. Even though it has a suitable band gap, it exhibited a significantly lower efficiency of ca. 0.11%. The very low performance could be attributable to the significantly low light absorption coefficient, and large non-radiative recombination of photo-induced charges via an oxidized form of S at the TiO2/perovskite interface.

Graphical abstract: Halogen-free guanidinium-based perovskite solar cell with enhanced stability

Supplementary files

Article information

Article type
Paper
Submitted
22 Jan 2018
Accepted
17 Apr 2018
First published
14 May 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 17365-17372

Halogen-free guanidinium-based perovskite solar cell with enhanced stability

N. Chandra Deb Nath, K. Yoo and J. Lee, RSC Adv., 2018, 8, 17365 DOI: 10.1039/C8RA00639C

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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