Impact of Alkyl Chain Length on the Properties of Fluorenyl-Based Linear Hole-Transport Materials in p-i-n Perovskites Solar Cells

Sun, Z; Liu, Z; Zhang, J; Zhou, C; Chen, Z; Chen, L; Zhang, S; Jia, X; Zhang, J; Zhou, Y; Song, B; Yuan, N; Ding, J

Impact of Alkyl Chain Length on the Properties of Fluorenyl-Based Linear Hole-Transport Materials in p-i-n Perovskites Solar Cells

Sun, Z Liu, Z Zhang, J Zhou, C Chen, Z Chen, L Zhang, S Jia, X

Zhang, J Zhou, Y Song, B Yuan, N Ding, J

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Publisher:: American Chemical Society
Publication Type:: Journal Article
Citation:: ACS Applied Energy Materials, 2022, 5, (7), pp. 7988-7996
Issue Date:: 2022-07-25

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Field	Value	Language
dc.contributor.author	Sun, Z
dc.contributor.author	Liu, Z
dc.contributor.author	Zhang, J
dc.contributor.author	Zhou, C
dc.contributor.author	Chen, Z
dc.contributor.author	Chen, L
dc.contributor.author	Zhang, S
dc.contributor.author	Jia, X https://orcid.org/0000-0002-9214-6917
dc.contributor.author	Zhang, J
dc.contributor.author	Zhou, Y
dc.contributor.author	Song, B
dc.contributor.author	Yuan, N
dc.contributor.author	Ding, J
dc.date.accessioned	2023-07-06T01:46:26Z
dc.date.available	2023-07-06T01:46:26Z
dc.date.issued	2022-07-25
dc.identifier.citation	ACS Applied Energy Materials, 2022, 5, (7), pp. 7988-7996
dc.identifier.issn	2574-0962
dc.identifier.issn	2574-0962
dc.identifier.uri	http://hdl.handle.net/10453/171236
dc.description.abstract	To develop low-cost and highly efficient hole-transport materials (HTMs), a series of linear HTMs based on a fluorenyl core were synthesized with different alkyl side chains substituted for the middle carbon atom, from methyl (FMT-M), and 2-ethylhexyl (FMT-EH) to dodecyl (FMT-D). Together with the hexyl substituent one (FMT), the photophysical and electronic properties, and hole-mobility of the compounds were investigated to determine the influence of the alkyl side chain on the performance of the material as dopant-free HTMs in p-i-n perovskite solar cells (pero-SCs) with the structure of ITO/HTM/MAPbI3-xClx/C60/BCP/Ag. All the linear molecules exhibit promising HTM properties including high transmittance, hole-mobility, and optimal energy level alignment with perovskites (MAPbI3-xClx). As the alkyl chain gets longer, the highest efficiency of corresponding p-i-n pero-SCs based on FMT-M, FMT-EH, FMT, and FMT-D increases from 16.68 and 17.60 to 18.57 and 19.99%, respectively. Through the investigation, it is determined that the alkyl side chain will affect the thermal stability, the melting point, and the intermolecular stacking of the linear molecules; thus, the corresponding HTMs obtain different transparency, hole-transport mobility, energy level, and film morphology, which together will affect the p-i-n pero-SCs performance.
dc.language	en
dc.publisher	American Chemical Society
dc.relation.ispartof	ACS Applied Energy Materials
dc.relation.isbasedon	10.1021/acsaem.2c00197
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	34 Chemical sciences
dc.subject.classification	40 Engineering
dc.title	Impact of Alkyl Chain Length on the Properties of Fluorenyl-Based Linear Hole-Transport Materials in p-i-n Perovskites Solar Cells
dc.type	Journal Article
utslib.citation.volume	5
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Computer Science
utslib.copyright.status	closed_access	*
pubs.consider-herdc	true
dc.date.updated	2023-07-06T01:46:24Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	5
utslib.citation.issue	7

Abstract:

To develop low-cost and highly efficient hole-transport materials (HTMs), a series of linear HTMs based on a fluorenyl core were synthesized with different alkyl side chains substituted for the middle carbon atom, from methyl (FMT-M), and 2-ethylhexyl (FMT-EH) to dodecyl (FMT-D). Together with the hexyl substituent one (FMT), the photophysical and electronic properties, and hole-mobility of the compounds were investigated to determine the influence of the alkyl side chain on the performance of the material as dopant-free HTMs in p-i-n perovskite solar cells (pero-SCs) with the structure of ITO/HTM/MAPbI3-xClx/C60/BCP/Ag. All the linear molecules exhibit promising HTM properties including high transmittance, hole-mobility, and optimal energy level alignment with perovskites (MAPbI3-xClx). As the alkyl chain gets longer, the highest efficiency of corresponding p-i-n pero-SCs based on FMT-M, FMT-EH, FMT, and FMT-D increases from 16.68 and 17.60 to 18.57 and 19.99%, respectively. Through the investigation, it is determined that the alkyl side chain will affect the thermal stability, the melting point, and the intermolecular stacking of the linear molecules; thus, the corresponding HTMs obtain different transparency, hole-transport mobility, energy level, and film morphology, which together will affect the p-i-n pero-SCs performance.

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http://hdl.handle.net/10453/171236