Lund, Torben

English

In the last decades dye-sensitized solar cells (DSCs) have extensively been studied. From an economical point of view, DSCs are of high interest because the manufacturing costs of DSCs devices are significantly lower compared with other solar devices such as silicon cells. One of the success criteria required for commercial use of DSCs is high stability under light soaking and thermal stress conditions. The dye sensitizer is one of the key components of a DSC device. Consequently, the stability of DSCs is directly linked to the dye stability, which is in turn linked to its degradation on the surface of a semiconductor anode (TiO2). In my lecture, I will present and overview of our degradation investigations of the ruthenium dyes N719, Z907 and C106 with the general structure RuLL´(NCS)2 and show how detailed degradation mechanistic knowledge is important in the developing of DSC cells with improved thermal dye stability [1,2]. In my talk, I will also include a brief account of our recent work on the development of new methods for reducing the dark current in DSCs prepared with one-electron mediators as ferrocenium/ferrocene and CoII/CoIII complexes. In order to reduce the back electron transfer from the photo anode to the mediator R+ and the oxidized dye S+ we have applied electrochemical grafting strategies to attach an electrical isolation layer of mono and multilayers of organic molecules on the TiO2 photo anode [3]

Roskilde Universitet

RoskildeUniversityThermal degradation chemistry of ruthenium complexes in the dye-sensitized solar celland strategies for reducing the dark currentLund, TorbenPublication date:2017Document VersionPublisher's PDF, also known as Version of recordCitation for published version (APA):Lund, T. (2017). Thermal degradation chemistry of ruthenium complexes in the dye-sensitized solar cell andstrategies for reducing the dark current. Paper presented at 21st International Conference of Solid State Ionics ,Padua, Italy.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain.            • You may freely distribute the URL identifying the publication in the public portal.Take down policyIf you believe that this document breaches copyright please contact rucforsk@kb.dk providing details, and we will remove access to the workimmediately and investigate your claim.Download date: 10. Nov. 2022Thermal degradation chemistry of ruthenium complexes in the dye-sensitized solar cell and strategies for reducing the dark current   Torben Lund(a)* and  Phuong Tuyet Nguyen(a),(b)  (a)Department of Science and Environment, Roskilde University, DK-4000, Denmark (b) Faculty of Chemistry, University of Science, Vietnam National University – Ho Chi Minh City, Vietnam Corresponding author: tlund@ruc.dk  Abstract. In the last decades dye-sensitized solar cells (DSCs) have extensively been studied. From an economical point of view, DSCs are of high interest because the manufacturing costs of DSCs devices are significantly lower compared with other solar devices such as silicon cells.  One of the success criteria required for commercial use of DSCs is high stability under light soaking and thermal stress conditions. The dye sensitizer is one of the key components of a DSC device. Consequently, the stability of DSCs is directly linked to the dye stability, which is in turn linked to its degradation on the surface of a semiconductor anode (TiO2). In my lecture, I will present and overview of our degradation investigations of the ruthenium dyes N719, Z907 and C106 with the general structure RuLL´(NCS)2  and show how detailed degradation mechanistic knowledge is important in the developing of DSC cells with improved thermal dye stability [1,2]. In my talk, I will also include a brief account of our recent work on the development of new methods for reducing the dark current in DSCs prepared with one-electron mediators as ferrocenium/ferrocene and CoII/CoIII complexes. In order to reduce the back electron transfer from the photo anode to the mediator  R+ and the oxidized dye S+ we have applied electrochemical grafting strategies to attach an electrical isolation layer of mono and multilayers of organic molecules on the TiO2 photo anode [3].  NNHOOCNaOOCNNRu NCSNCSSSSSN N CH2CH2CH2CH3 NNHOOCNaOOCNNRuNCSSSSSNNCH2CH2CH2CH3+1500 hoursheat at  80 CNCS-C10620-40 %60-80 %Equilibrium mixture  References   [1] P. T. Nguyen, P. E. Hansen, T. Lund, The effect of 4-tert-butylpyridine and Li+ on the thermal degradation of TiO2-bound ruthenium dye N719, Solar Energy 88 (2013) 23–30.  [2] T.Lund, P.T. Nguyen, H. M. Tran, P. Pechy, S. M. Zakeeruddin, M. Grätzel, Thermal stability of the DSC ruthenium dye C106 in robust electrolytes,  Solar Energy, 110 (2014) 94-104.  [3] T. Lund,  P. T. Nguyen, T. Ruhland “Electrochemical grafting of TiO2-based photo-anodes and its effect in dye-sensitized solar cells”Journal of Electroanalytical Chemistry 758 (2015) 85–92.  

Thermal degradation chemistry of ruthenium complexes in the dye-sensitized solar cell and strategies for reducing the dark current

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Thermal degradation chemistry of ruthenium complexes in the dye-sensitized solar cell and strategies for reducing the dark current

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