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The Importance of Pendant Groups on Triphenylamine-Based Hole Transport Materials for Obtaining Perovskite Solar Cells with over 20% Efficiency
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA.
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2018 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 8, no 2, article id 1701209Article in journal (Refereed) Published
Abstract [en]

Tremendous progress has recently been achieved in the field of perovskite solar cells (PSCs) as evidenced by impressive power conversion efficiencies (PCEs); but the high PCEs of >20% in PSCs has so far been mostly achieved by using the hole transport material (HTM) spiro-OMeTAD; however, the relatively low conductivity and high cost of spiro-OMeTAD significantly limit its potential use in large-scale applications. In this work, two new organic molecules with spiro[fluorene-9,9-xanthene] (SFX)-based pendant groups, X26 and X36, have been developed as HTMs. Both X26 and X36 present facile syntheses with high yields. It is found that the introduced SFX pendant groups in triphenylamine-based molecules show significant influence on the conductivity, energy levels, and thin-film surface morphology. The use of X26 as HTM in PSCs yields a remarkable PCE of 20.2%. In addition, the X26-based devices show impressive stability maintaining a high PCE of 18.8% after 5 months of aging in controlled (20%) humidity in the dark. We believe that X26 with high device PCEs of >20% and simple synthesis show a great promise for future application in PSCs, and that it represents a useful design platform for designing new charge transport materials for optoelectronic applications.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 8, no 2, article id 1701209
Keyword [en]
high efficiency, hole transport materials, perovskites, photovoltaic devices, solar cells
National Category
Environmental Engineering
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URN: urn:nbn:se:kth:diva-221930DOI: 10.1002/aenm.201701209ISI: 000419864800001Scopus ID: 2-s2.0-85040726245OAI: oai:DiVA.org:kth-221930DiVA, id: diva2:1178948
Note

QC 20180131

Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31Bibliographically approved

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