Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.247
Publication date: 18th July 2019
Hybrid Organic perovskites (HOP) are remarkable materials for light emission and photovoltaics applications. Yet, the interplay between their structural and the optoelectronic properties are not fully understood. In particular, the ability of charges to diffuse through the HOP structure is one of the most important properties for applications. Different techniques have been employed to evaluate the long range mobility/diffusion process in HOP materials. Among them, time resolved photoluminescence (TR-PL) microscopy is one of the most versatile[i]. It allows to investigate the diffusion with high spatial resolution (nanometre to micrometre range).
In this work, we study the diffusion of carriers in 2D and 3D perovskites single crystals. By successive measurements, we build a statistics of diffusion coefficients, ranging between 0.05 to 2 cm2.s-2, in agreement with previous studies[ii]. We highlight the influence of the local structure and traps on the diffusion coefficient and the diffusion lengths. To understand the influence of traps in details, we study the changes in diffusion behaviour upon different excitation densities or operating conditions (gas,temperature…). Finally, we perform time resolved two-photon (2P) photoluminescence tomography[iii], to probe the differences between the diffusive behaviour at the surface and in the bulk of the crystals. This work provides a better understanding about the chemical and physical factors that still limit the diffusion of carriers in HOP materials. This study will provide insight to further improve HOP materials and devices performances.
Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. C. S. thanks the EPSRC (Nano-Doctoral Training Centre), the Cambridge Trust and a Winton Graduate Exchange Scholarship for funding. This project has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under REA grant agreement number PIOF-GA-2013-622630, and the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement number 756962). S. D. S. acknowledges support from the Royal Society and Tata Group (UF150033). GD would like to acknowledge to Royal Society for funding through a Newton International Fellowship.
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