Partner: Elisabetta Salatelli

University of Bologna (IT)

Recent publications
1.Lanzi M., Salatelli E., Giorgini L., Mucci A., Pierini F., Di-Nicola F.P., Water-soluble polythiophenes as efficient charge-transport layers for the improvement of photovoltaic performance in bulk heterojunction polymeric solar cells, EUROPEAN POLYMER JOURNAL, ISSN: 0014-3057, DOI: 10.1016/j.eurpolymj.2017.10.032, Vol.97, pp.378-388, 2017
Abstract:

Water-soluble regioregular poly{3-[(6-sodium sulfonate)hexyl]thiophene} (PT6S) and poly{3-[(6-trimethylammoniumbromide)hexyl]thiophene} (PT6N) have been synthesized and employed both as photoactive layers for the assembling of “green” bulk-heterojunction organic solar cells and as charge-collection layers in a cell with “classic” architecture. While the photovoltaic performances obtained with the two aforementioned polymers were lower than the reference cell, their latter use allowed to notably increase the inherent J-V properties, leading to a considerable enhancement in the overall photovoltaic output. The power conversion efficiency of the optimized multilayer BHJ solar cell reached 4.78%, revealing a higher efficiency than the reference cell (3.63%).

Keywords:

Water-soluble polymer, Polythiophene derivative, Bulk heterojunction, Organic photovoltaic, Interfacial layer

Affiliations:
Lanzi M.-University of Bologna (IT)
Salatelli E.-University of Bologna (IT)
Giorgini L.-University of Bologna (IT)
Mucci A.-University of Modena (IT)
Pierini F.-IPPT PAN
Di-Nicola F.P.-University of Bologna (IT)
2.Lanzi M., Salatelli E., Di-Nicola F.P., Zuppiroli L., Pierini F., A new photocrosslinkable oligothiophene for organic solar cells with enhanced stability, MATERIALS CHEMISTRY AND PHYSICS, ISSN: 0254-0584, DOI: 10.1016/j.matchemphys.2016.10.034, Vol.186, pp.98-107, 2017
Abstract:

A novel thiophenic tetramer containing a cinnamate group in the side chain with a functionalization degree of 50% is reported. The tetramer was obtained by means of a simple and straightforward procedure involving the functionalization of a p-methoxyphenoxy substituted thiophenic precursor, which led to a soluble product with a good yield. The oligomer was fully characterized from a structural and chemical point of view and employed for the fabrication of small molecule organic solar cells exploiting the bulk heterojunction (BHJ) architecture. The presence of an UV-light sensitive group in the tetramer allowed the photocrosslinking of tetramer/PCBM blends, giving high values of photocurrent and conversion efficiency for the exposed samples. Moreover, the UV-treated devices showed improved stability, even upon heating for three days at 130 °C, thus confirming that photocrosslinking can strongly reduce phase segregation under severe operational conditions.

Keywords:

Electronic materials, Polymers, Fullerenes, Nanostructures, Electrical characterization, Semiconductors

Affiliations:
Lanzi M.-University of Bologna (IT)
Salatelli E.-University of Bologna (IT)
Di-Nicola F.P.-University of Bologna (IT)
Zuppiroli L.-University of Bologna (IT)
Pierini F.-IPPT PAN