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Open AccessArticle

Dopant-Free Hole Transport Materials with a Long Alkyl Chain for Stable Perovskite Solar Cells

1
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), Nanjing 211816, China
2
Zhongshan Institute of Modern industrial Technology, South China University of Technology, Zhongshan 528437, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2019, 9(7), 935; https://doi.org/10.3390/nano9070935
Received: 22 May 2019 / Revised: 17 June 2019 / Accepted: 24 June 2019 / Published: 28 June 2019
(This article belongs to the Special Issue Advances in Emerging Solar Cells )
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Abstract

Hole transport materials are indispensable to high efficiency perovskite solar cells. Two new hole transporting materials (HTMs), named 4,4′-(9-nonyl-9H-carbazole-3,6-diyl)bis (N,N-bis(4-methoxyphenyl)aniline) (CZTPA-1) and 4,4′-(9-methyl-9H-carbazole-3,6-diyl)bis (N,N-bis(4-methoxyphenyl)aniline)(CZTPA-2), were developed by different alkyl substitution methods. The two compounds, containing a carbazole core and triphenylamine (TPA) groups with different lengths of the alkyl chain, were designed and synthesized through a two-step synthesis approach. The power conversion efficiency (PCE) was found to be affected by the length of the alkyl chain, reaching 7% for CZTPA-1 and 11% for CZTPA-2. Furthermore, the CZTPA-2 still maintained 89.7% of its original performance after 400 h. The proposed results demonstrate the effect of carbon chain substituents on the efficiency of perovskite solar cells (PSCs). View Full-Text
Keywords: perovskite solar cell; alkyl chain; hole transporting materials; stable perovskite solar cell; alkyl chain; hole transporting materials; stable
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Wang, K.; Chen, H.; Niu, T.; Wang, S.; Guo, X.; Wang, H. Dopant-Free Hole Transport Materials with a Long Alkyl Chain for Stable Perovskite Solar Cells. Nanomaterials 2019, 9, 935.

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