Defect passivation in halide perovskite materials for highly efficient and highly stable perovskite solar cells
Monica Lira-Cantu a
a Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Invited Speaker, Monica Lira-Cantu, presentation 071
Publication date: 25th November 2019

Highly efficient halide perovskite solar cells (PSCs) can only be cost-competitive if their operational stability is ascertained. Defect control and passivation in the halide perovskite absorber is crucial for stability improvement. One recipe to achieve exceptional PV stabilities resides in the engineering and passivation of defects found in any material of the device. The reduction of defect density mitigates recombination and prolongs charge carrier lifetimes leading to efficient and stable PSCs. In the case of perovskite absorbers, low defect concentration has been found for single crystals. Their superior properties in comparison to polycrystalline thin films are ascribed to the presence of 2 – 4 orders of magnitude lower trap densities. Current reports focus on the growth of large perovskite grains and the passivation of defects at grain boundaries and interfaces through additive / interface engineering. Here, we demonstrate the application of an organic additive for the fabrication of high quality, low defect density polycrystalline perovskite thin films. This enables high efficient devices (21.1%) that can retain near 100 % of their original performance after 1,000 h of continuous operation at maximum power point under 1 sun illumination. Understanding the mechanism of defect passivation by organic molecules can facilitate the development of highly stable PSCs.

This article is based upon work from COST Action StableNextSol project MP1307, supported by COST (European Cooperation in Science and Technology). We thank the Spanish MINECO through the Severo Ochoa Centers of Excellence Program under Grant SEV-2013-0295 for the postdoctoral contract to H.X.. M.G. and S.M.Z. thank the King Abdulaziz City for Science and Technology (KACST) for the financial support. A. H. thank the financial support from the European Union H2020, ESPResSo project grant agreement 764047 and Swiss National Science Foundation project IZLCZ2_170177. Z.W. is thankful for the “China Scholarship Council” fellowship (CSC). H.-S.K., M.G. and S.M.Z. thank the financial support from the GRAPHENE Flagship Core 2 project supported by the European Commission H2020 Programme under contract 785219.  P.T. and J.A. acknowledge funding from Generalitat de Catalunya 2017 SGR 327 and the Spanish MINECO project ANAPHASE (ENE2017-85087-C3). To Spanish MINECO for the grant GraPErOs (ENE2016-79282-C5-2-R) and the OrgEnergy Excelence Network CTQ2016-81911-REDT. To AGAUR for the 217 SGR 329. ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is funded by the CERCA Programme / Generalitat de Catalunya.

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