Novel p-type Interlayers for CH3NH3PbI3 Perovskite Heterojunction Solar Cells

Dirk Guldi^a, Bianka Puscher^a, Rubén Costa^a, Christoph Brabec^b, Yi Hou^b

^aLehrstuhl für Physikalische Chemie I; Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Egerlandstr. 3, Erlangen, 91058, Germany

^bInstitute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Bianka Puscher, 435
Publication date: 5th February 2015

During the last years organometal halide perovskite materials have emerged as a promising light absorber material for thin-film solar cells applications due to its unique properties,(1) such as high optical absorption combined with a high extinction coefficient, and its distinctive charge transporting nature that allows both electrons and holes to pass though the semiconductor film. While best n-i-p planar based devices reach meanwhile a solar-to-electric power-conversion efficiency of 19% and more (2,3), they are limited to real life applications due to highly-expensive organic hole-transport materials, such as spiro-OMeTAD, and air-stability difficulties. The simplest way to face the above-mentioned problems is the use of a p-i-n planar based device structure, that is, inverted architectures.(4,5) In this work, we demonstrate a simple and price-competitive way of processing organometal trihalide perovskite onto a p-type semiconductors layers featuring enhanced stability, transparency, and carrier conductivity. Furthermore, the charge transfer processes at the different interfaces were optimized by means of electrochemical impedance spectroscopy (EIS) experiments.

1. 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.; Park, N.-G. Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%. Sci. Rep. 2012, 2, 1-7. 2. Zhou, H.; Chen, Q.; Li, G.; Luo, S.; Song, T.; Duan, H.-S.; Hong, Z.; You, J.; Liu, Y.; Yang, Y. Interface engineering of highly efficient perovskite solar cells. Science 2014, 345, 542-546. 3. Jeon, N.-J.; Noh, J. H.; Yang, W. S.; Kim, Y. C.; Ryu, S.; Seo, J.; Seok, S. I. Compositional engineering of perovskite materials for high-performance solar cells. Nature 2015, 517, 476-480. 4. Docampo, P.; Ball, J. M.; Darwich, M.; Eperon, G. E.; Snaith, H. J. Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates. Nat. Commun. 2013, 4, 2761-2767. 5. Li, M.-H.; Shen, P.-S.; Wang, K.-C.; Guo, T.-F.; Chen, P. Inorganic p-type contact materials for perovskite-based solar cells. J. Mater. Chem. A 2015, Doi: 10.1039/C4TA06425A.

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