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4-Tert-butylpyridine Free Organic Hole Transporting Materials for Stable and Efficient Planar Perovskite Solar Cells
Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA..
Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Univ Washington, Dept Chem, Seattle, WA 98195 USA..
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2017 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 7, no 19, article id 1700683Article in journal (Refereed) Published
Abstract [en]

4-Tert-butylpyridine (tBP) is an important additive in triarylamine-based organic hole-transporting materials (HTMs) for improving the efficiency and steady-state performance of perovskite solar cells (PVSCs). However, the low boiling point of tBP (196 degrees C) significantly affects the long-term stability and device performance of PVSCs. Herein, the design and synthesis of a series of covalently linked Spiro[fluorene-9,9'-xanthene] (SFX)-based organic HTMs and pyridine derivatives to realize efficient and stable planar PVSCs are reported. One of the tailored HTMs, N2, N2, N7, N7-tetrakis(4-methoxyphenyl)-3', 6'bis( pyridin-4-ylmethoxy) spiro[fluorene-9,9'-xanthene]-2,7-diamine (XPP) with two para-position substituted pyridines that immobilized on the SFX core unit shows a high power conversion efficiency (PCE) of 17.2% in planar CH3NH3PbI3-based PVSCs under 100 mW cm(-2) AM 1.5G solar illumination, which is much higher than the efficiency of 5.5% that using the well-known 2,2', 7,7'-tetrakis-(N, N-di-p-methoxy-phenyl-amine) 9,9'-spirobifluorene (SpiroOMeTAD) as HTM (without tBP) under the same condition. Most importantly, the pyridine-functionalized HTM-based PVSCs without tBP as additive show much better long-term stability than that of the state-of-the-art HTM SpiroOMeTAD- based solar cells that containing tBP as additive. This is the first case that the tBP-free HTMs are demonstrated in PVSCs with high PCEs and good stability. It paves the way to develop highly efficient and stable tBP-free HTMs for PVSCs toward commercial applications.

Place, publisher, year, edition, pages
2017. Vol. 7, no 19, article id 1700683
Keywords [en]
efficiency, hole transport materials, planar perovskite solar cells, pyridine, stable
National Category
Physical Chemistry Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-341664DOI: 10.1002/aenm.201700683ISI: 000414918700026OAI: oai:DiVA.org:uu-341664DiVA, id: diva2:1182915
Available from: 2018-02-15 Created: 2018-02-15 Last updated: 2018-02-15Bibliographically approved

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Zhang, Jinbao

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