Organic bulk hetero junction (BHJ) solar cells require broad absorption of the incident solar spectrum by the donor and acceptor in the blend. Fullerene derivatives with covalently linked dyes, referred to as dyads, were designed to have strong optical absorption and appropriate electronic levels for electron transfer with common donor polymers in BHJs. Dyads with dyes based on diketopyrrolopyrrole and benzothiadiazole were synthesized using either a methanofullerene or a fulleropyrrolidine linkage. Here, the performance of these dyad acceptors in BHJ solar cells with poly(3-hexylthiophene) (P3HT) and a low optical gap co-polymer of thiophene and diketopyrrolopyrrole (PDPP2FT) were examined. Although the solar power conversion efficiencies were low, charge generation from the molecular dye in the dyad could be observed in BHJs with PDPP2FT. The low power conversion efficiency was attributed to the morphology of the BHJs based on grazing incidence wide angle X-ray scattering patterns. Density functional theory was used to examine the charge transfer states between the donor and the dyad. The lowest energy charge-transfer state was found to be a transition from the donor polymer to the fullerene portion of the dyad.
Cowart Jr., John S., et al. "Donor-fullerene dyads for energy cascade organic solar cells." Inorganica Chimica Acta, vol. 468, no. C, Jul. 2017. https://doi.org/10.1016/j.ica.2017.07.008
Cowart Jr., John S., Liman, Christopher, Garnica, Amanda, Page, Zachariah A., Lim, Eunhee, Zope, Rajendra R., Baruah, Tunna, Hawker, Craig J., & Chabinyc, Michael L. (2017). Donor-fullerene dyads for energy cascade organic solar cells. Inorganica Chimica Acta, 468(C). https://doi.org/10.1016/j.ica.2017.07.008
Cowart Jr., John S., Liman, Christopher, Garnica, Amanda, et al., "Donor-fullerene dyads for energy cascade organic solar cells," Inorganica Chimica Acta 468, no. C (2017), https://doi.org/10.1016/j.ica.2017.07.008
@article{osti_1463300,
author = {Cowart Jr., John S. and Liman, Christopher and Garnica, Amanda and Page, Zachariah A. and Lim, Eunhee and Zope, Rajendra R. and Baruah, Tunna and Hawker, Craig J. and Chabinyc, Michael L.},
title = {Donor-fullerene dyads for energy cascade organic solar cells},
annote = {Organic bulk hetero junction (BHJ) solar cells require broad absorption of the incident solar spectrum by the donor and acceptor in the blend. Fullerene derivatives with covalently linked dyes, referred to as dyads, were designed to have strong optical absorption and appropriate electronic levels for electron transfer with common donor polymers in BHJs. Dyads with dyes based on diketopyrrolopyrrole and benzothiadiazole were synthesized using either a methanofullerene or a fulleropyrrolidine linkage. Here, the performance of these dyad acceptors in BHJ solar cells with poly(3-hexylthiophene) (P3HT) and a low optical gap co-polymer of thiophene and diketopyrrolopyrrole (PDPP2FT) were examined. Although the solar power conversion efficiencies were low, charge generation from the molecular dye in the dyad could be observed in BHJs with PDPP2FT. The low power conversion efficiency was attributed to the morphology of the BHJs based on grazing incidence wide angle X-ray scattering patterns. Density functional theory was used to examine the charge transfer states between the donor and the dyad. The lowest energy charge-transfer state was found to be a transition from the donor polymer to the fullerene portion of the dyad.},
doi = {10.1016/j.ica.2017.07.008},
url = {https://www.osti.gov/biblio/1463300},
journal = {Inorganica Chimica Acta},
issn = {ISSN 0020-1693},
number = {C},
volume = {468},
place = {United States},
publisher = {Elsevier},
year = {2017},
month = {07}}
STRUCTURAL AND ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES: XVI International Winterschool on Electronic Properties of Novel Materials, AIP Conference Proceedingshttps://doi.org/10.1063/1.1514168