Stabilizing doped Spiro-OMeTAD by organic molten salt for efficient and stable perovskite solar cells

Abstract

Bis(trifluoromethane)sulfonimide (LiTFSI) and 4-tert-butylpyridine (TBP) have been currently suggested to be irreplaceable in classic doped 2,2′,7,7′-tetrakis (N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD) for high-performance perovskite solar cells (PSCs). However, the stability of Spiro-OMeTAD was demonstrated to be seriously limited by the Li+ diffusion of LiTFSI and the volatilization of TBP. Here, we report an organic molten salt, Cyclohexylamine Trifluoroacetic acid (CYTFA), doping strategy to stabilize doped Spiro-OMeTAD for high-performance PSCs. We found the Li+ diffusion and the TBP volatilization were effectively suppressed through strong interaction by the dissociated CY+ and TFA- acting on TBP and Li+. Moreover, the CYTFA doped Spiro-OMeTAD exhibits an order of magnitude increase in hole mobility and matched energy levels with perovskite. As a result, a solar cell with a power-conversion efficiency of 25.80% was achieved with maintaining 96% and 80% of the initial efficiency for 500 hours at 55°C and 55% humidity and for 470 hours at the maximum power point, respectively.

Supplementary files

Transparent peer review

To support increased transparency, we offer authors the option to publish the peer review history alongside their article.

View this article’s peer review history

Article information

Article type
Paper
Submitted
25 Sep 2024
Accepted
28 Oct 2024
First published
29 Oct 2024

Energy Environ. Sci., 2024, Accepted Manuscript

Stabilizing doped Spiro-OMeTAD by organic molten salt for efficient and stable perovskite solar cells

T. Pan, Z. Li, B. Ren, W. Yang, X. Ran, Y. Li, Y. Xu, Y. Wang, D. Li, Y. Xia, X. Gao, L. Chao and Y. Chen, Energy Environ. Sci., 2024, Accepted Manuscript , DOI: 10.1039/D4EE04310C

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