Synthesis and characterization of different type of Polymers as a potential HTM for Perovskite solar cell
M. M. H. Desoky a, P. Quagliotto a, C. Barolo a, M. Bonomo a, G. Viscardi a, A. Di Carlo c, N. Yaghoobi Nia b
a Dipartimento di Chimica, Università degli Studi di Torino, via P. Giuria 7, Torino, 10125, Italy
b CHOSE - Centre for Hybrid and Organic Solar Energy, University of Rome ‘‘Tor Vergata’’, Via del Politecnico, 1, Roma, Italy
c University of Rome ‘‘Tor Vergata’’, via del Politecnico 1, Rome 00133, Italy.
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, M. M. H. Desoky, 241
Publication date: 11th February 2019

The increasing world energy demand makes compulsory the search of energy sources alternative to fossil fuels. Among alternative energy sources, the new frontier of the photovoltaic research is represented by  Perovskite Solar Cells (PSC), which rose in efficiency from 3.2% to 22-23% in only few years.[1] Polymeric Hole Transport Materials are used to both extract holes and protect perovskite from moisture degradation due to their superior sealant ability.[2] In this work we prepared several conductive polymers of the P3HT and PTAA families. P3HT structure was modulated in molecular weight and regioregularity, to search for correlations between structures and synthetic methods.[3] The P3HT were prepared by different synthetic methods, based on oxidant, C-H activation and living polymerization conditions. The oxidative method[4] gave polymers with moderate regioregularity and, in general, high molecular weight, while the C-H activation method[5] produced good regioregular polymers (92-95%) but having relatively low molecular weight (below 18-20 kDa). The GRIM method,[6] with a particular Ni catalyst, achieved nearly living polymerization conditions giving 100% regioregular P3HT of tuned very high molecular weight.

The PTAA were prepared by polymerization of dibromo-substituted linkers with different anilines, with a Pd catalyst bearing a NHC ligand.[7] Polymers with short to medium molecular weight were obtained.

The characterization was performed by UV-Vis, fluorescence spectroscopy, molecular weight determination, electrochemistry and thermal analysis. The polymers showed a very good stability and the estimation of energy levels was compatible with the most common perovskites used in solar cells.

P3HT and PTAA  have been used as HTMs  for fabrication of  perovskite solar cell using  crystal engineering method,[8] reaching the photo conversion efficiency of 17% and 13.4% respectively . The JV results confirm that  the synthesized polymers have a good potential for using  as a HTM in  PSCs.

This work was supported by the Italian Ministry of Economic Development in the framework of the Operating Agreement with ENEA for Research on the Electric System.

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