Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
3D hybrid halide organic-inorganic perovskites have become extremely popular over the last three years in the field of photovoltaics. In addition to its impressive efficiencies records in the solar-to-electricity conversion, they exhibit a wide range of possible structures and over the past thirty years, these materials were more intensively studied in their 2D form, for applications in optoelectronics and microelectronics.
In addition to an impressive structural variety, those materials exhibit a large spin-orbit coupling due to the most frequently used metals (Pb, Sn, Ge) [1]. Recent pump-probe experiments have also shown spin lifetime of around 7 ps [2]. Therefore, spin-based applications are also expected from the new superstar of photovoltaics. In particular, Rashba-Bychkov and/or Dresselhaus effects have been computationally predicted in several hybrid halide perovskites. In the case of the popular CH3NH3PbI3, it is even suspected that, although the structure is centrosymmetrical at room temperature, local distortions could give to a similar dynamical effect that enhances the carrier lifetime [3].
Here, we use symmetry analysis, density functional calculations and model Hamiltonians to scrutinize Rashba-Bychkov and Dresselhaus effects in hybrid organic-inorganic halide perovskites. With a detailed study of the electronic structures of a variety of system as well as the symmetries, we detail the origin of the spin splitting in two- and three-dimensional hybrid perovskites. Finally, we show that layered structures of CH3NH3PbX3 (X=I, Br) leads to a splitting that can be controlled by an applied electric field. From these observations we propose a setup for a spin-FET, opening the door to a perovskite-based spintronics [4].
[1] J. Even, L. Pedesseau, J.-M. Jancu, C. Katan, J. Phys. Chem. Lett. 2013, 4, 2999.
[2] D. Giovanni, H. Ma, J. Chua, M. Grätzel, R. Ramesh, S. Mhaisalkar, N. Mathews, T. C. Sum, Nano Lett. 2015, 15, 1553.
[3] F. Zheng, L. Z. Tan, S. Liu, A. M. Rappe, Nano Lett. 2015, 15, 7794.
[4] M. Kepenekian, R. Robles, C. Katan, D. Sapori, L. Pedesseau, J. Even, ACS Nano 2015, 9, 11557.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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