Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Analysis of the literature shows that the application of MALDI MS in solar energy research is rare and superficial. Scientists, working on conversion of solar energy into electricity, are usually contented with only confirmation of molecular weight of newly synthesised dyes. There has been only a few reports on more advanced applications of this mass spectrometry technique in the closely related field of organic light emitting diodes [1-3]. Nevertheless, MALDI MS has a high potential to be a powerful analytical tool for solar energy research. Dye-sensitised solar cells (DSCs) are ideal MALDI samples, because they are fabricated on conducting substrates and contain UV light absorbing materials (e.g. transition metal oxides and organic dyes). Therefore, these devices can be analysed as they are without any pre-treatment such as peeling off the electrodes, extracting the analytes, or dissolving the sample (Fig. 1).
Three different examples of the MALDI MS application will be presented:
1) determination of molecular weight of in-situ obtained poly(3,4-ethylenedioxythiophene) in complete solid-state DSC;
2) D35/Co(bpy)32/3+ solar cell degradation study;
3) complexation of an organic dye containing polyglycolic chains with alkali metal ions.
Figure 1. A complete solid-state dye sensitised solar cell (I) is being loaded into a MALDI mass spectrometer. The cell is mounted into a standard Bruker Daltonics slide adaptor (II) via the holder fabricated by the author (III).
[1]. Scholz, S.; Walzer, K.; Leo. K. Analysis of complete organic semiconductor devices by laser desorption/ionisation time-of-flight mass spectrometry, Adv. Funct. Mater., 2008, 18, 2541–2547. [2]. Moraes, I.R.D.; Scholz, S.; Lüssem, B.; Leo, K. Analysis of chemical degradation mechanism within sky blue phosphorescent organic light emitting diodes by laser-desorption/ionization time-of-flight mass spectrometry, Organic Electronics. 2011, 12, 341–347. [3]. Scholz, S.; Meerheim, R.; Lüssem, B.; Leo, K. Laser desorption/ionization time-of-flight mass spectrometry: A predictive tool for the lifetime of organic light emitting devices, Applied Physics Letters., 2009, 94, 043314
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