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A Silanol-Functionalized Polyoxometalate with Excellent Electron Transfer Mediating Behavior to ZnO and TiO 2 Cathode Interlayers for Highly Efficient and Extremely Stable Polymer Solar Cells

Tountas, Marinos
; 
Topal, Yasemin
; 
Verykios, Apostolos
; 
Soultati, Anastasia
; 
Kaltzoglou, Andreas
; 
Papadopoulos, Theodoros A.
; 
Auras, Florian
; 
Seintis, Kostas
; 
Fakis, Mihalis
; 
Palilis, Leonidas C.
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Affiliation
National Centre for Scientific Research “Demokritos"; University of Athens; Pamukkale University Cal Vocational High School; University of Patras; University of Chester; University of Cambridge; University of Konstanz; Selcuk University
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2017-12-21
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Natural Sciences
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Abstract
Combining high efficiency and long lifetime under ambient conditions still poses a major challenge towards commercialization of polymer solar cells. Here we report a facile strategy that can simultaneously enhance the efficiency and temporal stability of inverted photovoltaic architectures. Inclusion of a silanol-functionalized organic–inorganic hybrid polyoxometalate derived from a PW9O34 lacunary phosphotungstate anion, namely (nBu4N)3[PW9O34(tBuSiOH)3], significantly increases the effectiveness of the electron collecting interface, which consists of a metal oxide such as titanium dioxide or zinc oxide, and leads to a high efficiency of 6.51% for single-junction structures based on poly(3-hexylthiophene):indene-C60 bisadduct (P3HT:IC60BA) blends. The above favourable outcome stems from a large decrease in the work function, an effective surface passivation and a decrease in the surface energy of metal oxides which synergistically result in the outstanding electron transfer mediating capability of the functionalized polyoxometalate. In addition, the insertion of a silanol-functionalized polyoxometalate layer significantly enhances the ambient stability of unencapsulated devices which retain nearly 90% of their original efficiencies (T90) after 1000 hours.
Citation
Tountas, M., et al. (2017). A Silanol-Functionalized Polyoxometalate with Excellent Electron Transfer Mediating Behavior to ZnO and TiO 2 Cathode Interlayers for Highly Efficient and Extremely Stable Polymer Solar Cells. Journal of Materials Chemistry C, 6, 1459-1469. http://doi.org/10.1039/C7TC04960A
Publisher
Royal Society of Chemistry
Journal
Journal of Materials Chemistry C
Research Unit
URI
http://hdl.handle.net/10034/620964
DOI
10.1039/C7TC04960A
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Article
Language
en
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ISSN
2050-7526
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http://pubs.rsc.org/en/content/articlelanding/2018/tc/c7tc04960a#!divAbstract