Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Organic and organic-inorganic hybrid solar cells have attracted enormous interest in recent years, as they potentially offer high energy conversion efficiencies at low cost and on flexible substrates. In this context, various conjugated donor-acceptor (D-A) substituted oligomers have been developed and reported to be efficient in solar energy harvesting.1 Recently, both vacuum- and solution-processed small molecule OSCs comprising structurally defined oligomers have shown power conversion efficiencies exceeding 7%.2-4 Typically, in these materials oligothiophenes are widely used as building blocks due to their tunable optoelectronic and excellent charge carrier transport properties. In last five years organo-lead trihalide CH3NH3Pb(I1−xBrx)3 perovskite-based solar cells have gained immense attention as promising high performance next-generation photovoltaics reaching PCEs over 15%.[5]In these devices wide band gap spiro-MeOTAD has been used as the hole transporting material (HTM)
In the present work, we will discuss the synthesis and characterization of a novel series of A-D-A-type oligomers and its use as hole transport material (HTM) in perovskite-based solar cells. These oligomers allow fine-tuning of the frontier orbital energies by variation of the linkers between the central thiophene-pyrrol-based S,N-heteroacene unit and the terminal dicyanovinylene (DCV) acceptor groups, thus contributing to the effective charge transport and the photocurrent enhancement in the device. Solution-processed solid-state solar cells fabricated using perovskite as light absorber and the new HTMs exhibited power conversion efficiencies exceeding 10%.The correlation of the molecular structure with the device performance was investigated.
[1] Mishra, A.; Bäuerle, P. Angew. Chem. Int. Ed. 2012, 51, 2020–2067. [2] Fitzner, R.; Mena-Osteritz, E.; Mishra, A.; Schulz, G.; Reinold, E.; Weil, M.; Körner, C.; Ziehlke, H.; Elschner, C.; Leo, K.; Riede, M.; Pfeiffer, M.; Uhrich, C.; Bäuerle, P. J. Am. Chem. Soc. 2012, 134, 11064–11067. [3] Gupta, V.; Kyaw, A. K. K.; Wang, D. H.; Chand, S.; Bazan, G. C.; Heeger, A. J. Sci. Rep. 2013, 3, 1965 doi: 10.1038/srep01965. [4] Zhou, J.; Zuo, Y.; Wan, X.; Long, G.; Zhang, Q.; Ni, W.; Liu, Y.; Li, Z.; He, G.; Li, C.; Kan, B.; Li, M.; Chen, Y. J. Am. Chem. Soc. 2013, 135, 8484–8487. [5] (a) Etgar, L.; Gao, P.; Xue, Z.; Peng, Q.; Chandiran, A. K.; Liu, B.; Nazeeruddin, M. K.; Grätzel, M. J. Am. Chem. Soc. 2012, 134, 17396–17399. (b) Burschka, J.; Pellet, N.; Moon, S.-J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Grätzel, M. Nature 2013, 499, 316–319.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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