Issue 30, 2023

A dual functional molecule for perovskite/P3HT interface to achieve stable perovskite solar cells

Abstract

After the introduction of spiro-OMeTAD as a hole transport material (HTM), the efficiency of perovskite solar cells (PSCs) has skyrocketed. However, dopants in spiro-OMeTAD make PSCs vulnerable to moisture and heat. Furthermore, the cost of spiro-OMeTAD is quite high, impeding the commercialization of PSCs. Therefore, the demand for HTMs that are dopant-free and cost-effective is increasing. In this regard, P3HT satisfies these criteria, exhibiting low-cost, long term stability, and high hole mobility. Despite these advantages, the PSCs with P3HT showed a lower efficiency compared to those PSCs with spiro-OMeTAD. Herein, we newly synthesized and employed a dual functional molecule, octylammonium azide (OAN3). The ammonium ion could interact with perovskite and passivate the defects in perovskite and the azide moiety could provide crosslinking sites with P3HT, improving both efficiency and long-term stability. As a result, the perovskite solar cells (PSCs) with OAN3 obtained a maximum efficiency of 20.0%. In contrast, bare PSCs achieved a maximum efficiency of 13.8%. In addition, PSCs with OAN3 maintained 90% and 82% of their initial efficiency under RH = 50–60% condition. However, the bare PSCs retained 38% of their initial efficiency under the same conditions.

Graphical abstract: A dual functional molecule for perovskite/P3HT interface to achieve stable perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
31 3 2023
Accepted
05 7 2023
First published
11 7 2023

J. Mater. Chem. A, 2023,11, 16363-16369

A dual functional molecule for perovskite/P3HT interface to achieve stable perovskite solar cells

H. Choi, H. Lim, H. Kim, J. Lim, M. Park, C. S. Pathak and S. Song, J. Mater. Chem. A, 2023, 11, 16363 DOI: 10.1039/D3TA01910A

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