A persistent limitation of organic semiconductors is their low dielectric constant єr, which limits the performance of bulk heterojunction (BHJ) solar cells. One way to increase єr is to employ high-єr additives, such as PbS nanocrystals (QDs) to BHJ blends. In this work, we use the recombination of the interfacial charge transfer (CT) state as a means to study the effects of PbS nanocrystals on blends of a narrow bandgap copolymer: poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1- b;3,4-b′]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT), and phenyl-C61-butyric acid methyl ester (PCBM). We show that at low dilution levels (0.25% - 0.75% by weight), there is a decrease in the relative weight of the CT recombination lifetime (longer decay component); suggesting that there is an increase in the local єr of the ternary blend.
 M. Manca, C. Piliego, E. Wang, M.R. Andersson, A. Mura and M.A. Loi, J. Mater. Chem. A, 2013, 1, 7321.Search in Google Scholar
 D. Veldman, O. Ipek, S.C.J. Meskers, J. Sweelssen, M.M. Koetse, S.C. Veenstra, J.M. Kroon, S.S. van Bavel, J. Loos and R.A.J. Janssen, J. Am. Chem. Soc., 2008, 130, 7721-7735.10.1021/ja8012598Search in Google Scholar PubMed
 C. Piliego and M.A. Loi, J. Mater. Chem., 2012, 22, 4141.Search in Google Scholar
 M. C. Scharber, C. Lungenschmied, H.-J. Egelhaaf, G. Matt, M. Bednorz, T. Fromherz, J. Gao, D. Jarzab and M.A. Loi, Energy Environ. Sci., 2011, 4, 5077.Search in Google Scholar
 H.J. Son, B. Carsten, I.H. Jung and L. Yu, Energy Environ. Sci., 2012, 5, 8158.Search in Google Scholar
 S. Torabi, F. Jahani, I. Van Severen, C. Kanimozhi, S. Patil, R.W.A. Havenith, R.C. Chiechi, L. Lutsen, D.J.M. Vanderzande, T.J. Cleij, J.C. Hummelen and L.J.A. Koster, Adv. Funct. Mater., 2015, 25, 150-157.10.1002/adfm.201402244Search in Google Scholar
 C. Poelking, M. Tietze, C. Elschner, S. Olthof, D. Hertel, B. Baumeier, F. Würthner, K. Meerholz, K. Leo and D. Andrienko, Nat. Mater., 2014, 14, 434-439.10.1038/nmat4167Search in Google Scholar PubMed
 A. Gocalińska, M. Saba, F. Quochi, M. Marceddu, K. Szendrei, J. Gao, M. A. Loi, M. Yarema, R. Seyrkammer, W. Heiss, A. Mura and G. Bongiovanni, J Phys Chem Lett., 2010,1, 1149-1154.10.1021/jz100116tSearch in Google Scholar
 M.C. Scharber, M. Koppe, J. Gao, F. Cordella, M.A. Loi, P. Denk, M. Morana, H.J. Egelhaaf, K. Forberich, G. Dennler, R. Gaudiana, D. Waller, Z. Zhu, X. Shi and C. J. Brabec, Adv. Mater., 2010, 22, 367-370.10.1002/adma.200900529Search in Google Scholar PubMed
© 2018 by Mustapha Abdu-Aguye, et al., published by De Gruyter
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.