Vapor Phase Deposited Single Junction and Tandem Perovskite Solar Cells.
Henk Bolink a
a Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Carrer del Catedrátic José Beltrán Martinez, 2, Paterna, Spain
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Invited Speaker, Henk Bolink, presentation 019
Publication date: 11th February 2019

Organic-inorganic (hybrid) lead halide perovskites have recently attracted a self-standing, wide research field thanks to the demonstration of solar cells with rapidly increasing power conversion efficiencies (PCEs), now exceeding 20%. The interest toward these materials arises from the possibility of processing them into thin films by solution or vacuum techniques, which might lead to efficient and inexpensive photovoltaic devices. Hybrid perovskites have a wide spectrum of desirable properties; they are direct bandgap semiconductors with very high absorption coefficients, high and balanced hole and electron mobility, and large diffusion length. A unique feature of these materials is their versatility in terms of bandgap energy, which can be tuned by simple exchange of their components.Perovskite based solar cells, mostly employ solution processed perovskite layers. Evaporated methylammonium lead iodide perovskite layers have also been reported and been employed in solar cells. Our group has developed several perovskite based solar cells, using vacuum based perovskite preparation methods. These metal oxide free p-i-n type perovskite cells exhibit high power-conversion efficiencies. We have extended this work to fully evaporated perovskite devices reaching power conversion efficiencies as high as 20 % in a planar single junction device and similar performance in tandem devices. Avenues to further increase the device performance by using multiple cation perovskite prepared via sublimation will also be presented.                                                                                                                                                                                                                                                                                                                                                                                                                       

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