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Article: Imide-functionalized acceptor–acceptor copolymers as efficient electron transport layers for high-performance perovskite solar cells

TitleImide-functionalized acceptor–acceptor copolymers as efficient electron transport layers for high-performance perovskite solar cells
Authors
KeywordsButyric acid
Electron energy levels
Electron transport properties
Molecular orbitals
Naphthalene
Issue Date2020
PublisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/ta#!recentarticles&all
Citation
Journal of Materials Chemistry A, 2020, v. 8 n. 27, p. 13754-13762 How to Cite?
AbstractElectron transport layers (ETLs) are critical for improving device performance and stability of perovskite solar cells (PVSCs). Herein, a distannylated electron-deficient bithiophene imide (BTI-Tin) is synthesized, which enables us to access structurally novel acceptor–acceptor (A–A) type polymers. Polymerizing BTI-Tin with dibrominated naphthalene diimide (NDI-Br) and perylene diimide (PDI-Br) affords two A–A copolymers P(BTI-NDI) and P(BTI-PDI). The all-acceptor backbone yields both low-lying highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels for the polymers, which combined with their high electron mobility render P(BTI-NDI) and P(BTI-PDI) as promising ETLs for perovskite solar cells (PVSCs). When applied as ETLs to replace the conventional [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) in planar p–i–n PVSCs, the PC61BM-free devices based on P(BTI-NDI) and P(BTI-PDI) achieve remarkable power conversion efficiencies (PCEs) of 19.5% and 20.8%, respectively, with negligible hysteresis. Such performance is attributed to efficient electron extraction and reduced charge recombination. Moreover, the devices based on P(BTI-NDI) and P(BTI-PDI) ETLs show improved stability compared to the PC61BM based ones due to the higher hydrophobicity of the new ETLs. This work provides important guidelines for designing n-type polymers to replace PC61BM as efficient ETLs for high-performance PVSCs with improved stability.
Persistent Identifierhttp://hdl.handle.net/10722/285496
ISSN
2019 Impact Factor: 11.301
2015 SCImago Journal Rankings: 2.770

 

DC FieldValueLanguage
dc.contributor.authorShi, Y-
dc.contributor.authorChen, W-
dc.contributor.authorWu, Z-
dc.contributor.authorWang, Y-
dc.contributor.authorSun, W-
dc.contributor.authorYang, K-
dc.contributor.authorTang, YM-
dc.contributor.authorWoo, HY-
dc.contributor.authorZhou, M-
dc.contributor.authorDjurisic, AB-
dc.contributor.authorHe, Z-
dc.contributor.authorGuo, X-
dc.date.accessioned2020-08-18T03:53:58Z-
dc.date.available2020-08-18T03:53:58Z-
dc.date.issued2020-
dc.identifier.citationJournal of Materials Chemistry A, 2020, v. 8 n. 27, p. 13754-13762-
dc.identifier.issn2050-7488-
dc.identifier.urihttp://hdl.handle.net/10722/285496-
dc.description.abstractElectron transport layers (ETLs) are critical for improving device performance and stability of perovskite solar cells (PVSCs). Herein, a distannylated electron-deficient bithiophene imide (BTI-Tin) is synthesized, which enables us to access structurally novel acceptor–acceptor (A–A) type polymers. Polymerizing BTI-Tin with dibrominated naphthalene diimide (NDI-Br) and perylene diimide (PDI-Br) affords two A–A copolymers P(BTI-NDI) and P(BTI-PDI). The all-acceptor backbone yields both low-lying highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels for the polymers, which combined with their high electron mobility render P(BTI-NDI) and P(BTI-PDI) as promising ETLs for perovskite solar cells (PVSCs). When applied as ETLs to replace the conventional [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) in planar p–i–n PVSCs, the PC61BM-free devices based on P(BTI-NDI) and P(BTI-PDI) achieve remarkable power conversion efficiencies (PCEs) of 19.5% and 20.8%, respectively, with negligible hysteresis. Such performance is attributed to efficient electron extraction and reduced charge recombination. Moreover, the devices based on P(BTI-NDI) and P(BTI-PDI) ETLs show improved stability compared to the PC61BM based ones due to the higher hydrophobicity of the new ETLs. This work provides important guidelines for designing n-type polymers to replace PC61BM as efficient ETLs for high-performance PVSCs with improved stability.-
dc.languageeng-
dc.publisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/ta#!recentarticles&all-
dc.relation.ispartofJournal of Materials Chemistry A-
dc.subjectButyric acid-
dc.subjectElectron energy levels-
dc.subjectElectron transport properties-
dc.subjectMolecular orbitals-
dc.subjectNaphthalene-
dc.titleImide-functionalized acceptor–acceptor copolymers as efficient electron transport layers for high-performance perovskite solar cells-
dc.typeArticle-
dc.identifier.emailChen, W: chenw20@hku.hk-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.authorityDjurisic, AB=rp00690-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/D0TA03548C-
dc.identifier.scopuseid_2-s2.0-85089485078-
dc.identifier.hkuros312902-
dc.identifier.volume8-
dc.identifier.issue27-
dc.identifier.spage13754-
dc.identifier.epage13762-
dc.publisher.placeUnited Kingdom-

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