Spatially Resolved Optical Properties of Hybrid Perovskites with Tunable Band Gaps

Sarah Brittman^a, Erik Garnett^a

^aCenter for Nanophotonics, AMOLF, The Netherlands, Science Park, 104, Amsterdam, Netherlands

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, Sarah Brittman, 277
Publication date: 5th February 2015

The success of lead-based, inorganic-organic hybrid perovskites in photovoltaics arises in part from properties such as their strong absorption near the band gap,¹ long minority carrier lifetimes,² and simple processing from solution³ or vapor deposition.⁴ These properties that make hybrid perovskites successful in solar cells also make them attractive for light emission applications such as light-emitting diodes^5,6 and lasers.^7-9 For these new applications, and also potentially for multijunction solar cells, hybrid perovskites with band gaps higher than the iodide-based materials are of great interest. This work explores the structural and optical properties of lead-based perovskites made from bromide-chloride mixtures, whose band gap can be tuned across the green and blue regions of the spectrum. Spatially resolved mapping of absorption and luminescence with micrometer resolution provides insight into how the material’s optical properties can change with the perovskite film’s morphology and chemical composition. For example, films of bromide-chloride mixtures exhibit local shifts in luminescence that could indicate spatially varying material composition (Figure 1). How such optical properties vary with film deposition conditions and morphology could offer guidance in optimizing perovskite films for photovoltaic and light emission applications.
Figure 1: Spatially resolved photoluminescence of a film of CH3NH3PbX3 where X is 3:1 Br:Cl. The maps show how the wavelength of the maximum of the photoluminescence (a) and the photoluminescence’s maximum intensity (b) vary with position.
1. Sutherland, B.R.; Hoogland, S.; Adachi, M. M.; Kanjanaboos, P.; Wong, C. T. O.; McDowell, J. J.; Xu, J.; Voznyy, O.; Ning, Z.; Houtepen, A. J.; Sargent, E. H. Perovskite Thin Films Via Atomic Layer Deposition. Adv. Mater. 2014, 27, 53-58. 2. Stranks, S. D.; Eperon, G. E.; Grancini, G.; Menelaou, C.; Alcocer, M. J. P.; Leijtens, T.; Herz, L. M.; Petrozza, A.; Snaith, H. J. Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber. Science 2013, 342, 341-343. 3. Burschka, J.; Pellet, N.; Moon, S-J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Grätzel, M. Sequential Deposition as a Route to High-Performance Perovskite-Sensitized Solar Cells. Nature 2013, 499, 316-319. 4. Liu, M.; Johnston, M. B.; Snaith, H. J. Efficient Planar Heterojunction Perovskite Solar Cells by Vapour Deposition. Nature 2013, 501, 395-398. 5. Tan, Z-K.; Moghaddam, R. S.; Lai, M. L.; Docampo, P.; Higler, R.; Deschler, F.; Price, M.; Sadhanala, A.; Pazos, L. M.; Credgington, D.; Hanusch, F.; Bein, T. ; Snaith, H. J.; Friend, R. H. Bright Light-Emitting Diodes Based on Organometal Halide Perovskite. Nature Nanotech. 2014, 9, 687-692. 6. Kim, Y-H.; Cho, H.; Heo, J. H.; Kim, T-S.; Myoung, N.; Lee, C-L.; Im, S. H.; Lee, T-W. Multicolored Organic/Inorganic Hybrid Perovskite Light-Emitting Diodes. Adv. Mater. 2014, doi: 10.1002/adma.201403751. 7. Deschler, F.; Price, M.; Pathak, S.; Klintberg, L.E.; Jarausch, D.; Higler, R.; Hu, S.; Leijtens, T.; Stranks, S. D.; Snaith, H. J.; Atatu, M.; Phillips, R. T.; Friend, R. H. High Photoluminescence Efficiency and Optically Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors. J. Phys. Chem. Lett. 2014, 1421-1426. 8. Sutherland, B. R.; Hoogland, S.; Adachi, M. M.; Wong, C. T. O.; Sargent, E. H. Conformal Organohalide Perovskites Enable Lasing on Spherical Resonators. ACS Nano 2014, 8, 10947-10952. 9. Zhang, Q.; Ha, S. T.; Liu, X.; Sum, T. C.; Xiong, Q. Room-Temperature Near-Infrared High-Q Perovskite Whispering-Gallery Planar Nanolasers. Nano Lett. 2014, 14, 5995-6001.

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