Material properties of photonic crystal-based perovskite solar cells

Mauricio E. Calvo^a, Gabriel Lozano^a, Hernán Míguez^a, Miguel Anaya^a, Henry J. Snaith^b, Michael B. Johnston^b, Wei Zhang^b

^aDepartment of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

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, Miguel Anaya, 249
Publication date: 5th February 2015

Perovskite solar cells (PSCs) are driven a paradigm shift in photovoltaics since they are breaking with the existing tradeoff between efficiency and fabrication cost.^1,2 In the last years this solar cell technology has taken the lead of the emerging solar cell efficiency race, reaching certified values that surpass all the ones attained in cells based on solution-processed materials. Photonic design has proven to be a useful tool to improve the performance of thin film PV technologies. In this poster we will provide an in depth description about the material properties required to achieve photonic scaffolds to attain a fine control over the color of the PSC. Porous 1DPC are built from the alternate deposition of porous layers made of materials that show a different refractive index. Nevertheless, standard materials and solution-processing procedures to fabricate such multilayers are not compatible with the ones typically used in the field of PSCs. Herein we will investigate the chemical compatibility and the infiltration of the perovskite precursors on the porous materials that comprise the 1DPC. Then we will discuss about the relevance of the concentration, acceleration ramp and final speed of the spin coating method together with the heat treatment in the optical/electrical quality of the different perovskite infiltrated layers deposited. Finally, we will investigate the role that the thickness and the porosity of each layer forming the unit cell of the 1DPC play in the optical properties of the photonic scaffold and therefore in the color exhibited by perovskite devices.³ Our results provide an experimental guide to fabricate multilayered scaffolds which lead to a fine tuning of the aesthetical properties of PSCs.

1. Lee, M. M.; Teuscher, J.; Miyasaka, T.; Murakami, T. N.; Snaith, H. J. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science 2012, 338, 643-647. 2. Green, M. A.; Ho-Baillie, A.; Snaith, H. J. The Emergence of Perovskite Solar Cells. Nature Photonics 2014, 8, 506-514. 3. Zhang, W.; Anaya, M.; Lozano, G.; Calvo, M. E.; Johnston, M. B.; Míguez, H.; Snaith, H. J. Highly Efficient Perovskite Solar Cells with Tuneable Structural Color. Nano Letters, accepted.

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