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Acceptor Donor Acceptor type ionic molecule materials for efficient perovskite solar cells and organic solar cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
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2016 (English)In: NANO ENERGY, ISSN 2211-2855, Vol. 30, p. 387-397Article in journal (Refereed) Published
Abstract [en]

Perovskite solar cells (PSCs) have attracted significant interest and hole transporting materials (HTMs) play important roles in achieving high efficiency. Here, we report additive free ionic type HTMs that are based on 2-ethylhexyloxy substituted benzodithiophene (BDT) core unit. With the ionization of end-capping pyridine units, the hole mobility and conductivity of molecular materials are greatly improved. Applied in PSCs, ionic molecular material M7-TFSI exhibits the highest efficiency of 17.4% in the absence of additives [lithium bis(trifluor-omethanesulfonyl)imide and 4-tert-butylpyridine]. The high efficiency is attributed to a deep highest occupied molecular orbital (HOMO) energy level, high hole mobility and high conductivity of M7-TFSI. Moreover, due to the higher hydrophobicity of M7-TFSI, the corresponding PSCs showed better stability than that of Spiro-OMeTAD based ones. In addition, the strong absorption and suitable energy levels of materials (M6, M7-13r and M7-TFSI) also qualify them as donor materials in organic solar cells (OSCs) and the devices containing M7-TFSI as donor material displayed an efficiency of 6.9%.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 30, p. 387-397
Keywords [en]
Perovskite solar cell, Organic solar cell, Hole transport material, Donor material
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-200229DOI: 10.1016/j.nanoen.2016.10.041ISI: 000390636100047Scopus ID: 2-s2.0-84994030114OAI: oai:DiVA.org:kth-200229DiVA, id: diva2:1073686
Funder
Swedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20160213

Available from: 2017-02-13 Created: 2017-02-13 Last updated: 2017-02-16Bibliographically approved

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Liu, PengKloo, LarsSun, Licheng

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