Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Within the last decade the field of organometallic perovskite solar cells has progressed greatly. Improvements on the nanostructure of the perovskite photovoltaic device has resulted in efficiencies exceeding 15%[1] and high efficiencies have also been reported for devices using various types of mesoporous metal oxide layers[2],[3].
Understanding of charge transport processes in hybrid organic-inorganic perovskites is essential for further improvement of the organometallic perovskite photovoltaic devices. Accurately modelling the fundamental electronic behavior of these materials could play a major role in describing their effectiveness as light absorbing materials in solar cells.
Previous reports[3],[4] have shown that the charge-separation dynamics of organometallic perovskites are highly dependent on the metal oxide scaffolding layer used in photovoltaic devices. In the presented study, we seek to elucidate the role of the metal oxide substrate on the electronic behavior of the perovskite. Conductivity was measured for the solution processed (CH3NH3)PbI3 perovskite suspended on different metal oxides. The electronic properties of the different samples were observed to be dependent on the solvent choice for the perovskite precursor solution and on the metal oxide substrate.
[1] Liu, D.; Kelly, T. L. Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques. Nat. Photonics 2013, 8, 133–138. [2] Bi, D.; Moon, S.J.; Häggman, L.; Boschloo, G.; Yang, L.; Johansson, E.; Nazeeruddin, M.K.; Grätzel, M. and Hagfeldt, A. Using a two-step deposition technique to prepare perovskite (CH3NH3PbI3) for thin film solar cells based on ZrO2 and TiO2 mesostructures. RSC Adv. 2013, 3, 18762-18766. [3] Kim, H.S.; Lee, C.R.; Im, J.H.; Lee, K.B.; Moehl, T.; Marchioro, A.; Moon, S.J.; Humphry-Baker, R.; Yum, J.H.; Moser, J.E.; Grätzel, M. and Park, N.G. Lead iodide perovskite sensitized all-solid-state submicron thin film mesoscopic solar cell with efficiency exceeding 9%. Sci. Rep. 2012 , 2:591. [4] Kim, H.S.; Mora-Sero, I.; Gonzalez-Pedro, V.; Fabregat-Santiago, F.; Juarez-Perez, E.J.; Park, N.G. and Bisquert, J. Mechanism of carrier accumulation in perovskite thin-absorber solar cells. Nat. Commun. 2013, 4:2242.
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