Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.014
Publication date: 11th December 2017
The last years, the Hybrid Perovskite solar cells showed a high photoconversion efficiency (PCE) up to 22,7%.[1] The best performances were obtained with the three-dimensional CH3NH3PbI3 and derivatives such as mixed small cations and mixed halogens (Rb,Cs,FA,MA)PbI(3-x)Br(x) compounds, where MA+=methylammonium and FA+=formamidinium.[2]
Very recently, we have discovered a new family of hybrid perovskites, named d-MAPI, which can be prepared as single crystals, crystallized powders and crystallized thin films. A d-MAPI phase is lead and iodide deficient compared to MAPI (CH3NH3PbI3): a (PbI)+ unit being substituted by an organic monocation, while keeping a 3D architecture. By using two kinds of organic cations, the methylammonium and the ethanolammonium (HEA+), a series of d-MAPI compounds whose general formulation is (MA)1-2.48x(HEA)3.48x[Pb1-xI3-x] (0<x<0.20) has been obtained. The substitution of (PbI)+ unit leads to the formation of channels along c axis. Channels of this network can be filled by extra Pb2+ and I- ions and organic cations (when x<0.20) or only by organic cations (when x= 0.20). First experiments using d-MAPI layers for an application as absorber materials in regular FTO/compact-TiO2/meso-TiO2/Perovskite/SpiroOMeTAD/Ag PSCs have shown that d-MAPI (x= 0.10) exhibits a PCE of 6%. Moreover, a relative stability test of thins films of MAPI and d-MAPI (x= 0.10) has revealed that d-MAPI thin films are more stable than the MAPI ones. This new type of hybrid perovskite (A,A’)1+x[Pb1-xX3-x ] (A= MA+, A’= HEA+) offers increased flexibility of its chemical composition with potential substitutions on the A, A’, Pb and X sites.
References:
[1] NREL efficiency chart: https://www.nrel.gov/pv/assets/images/efficiency-chart.png
[2] Michael Gratzel, Acc. Chem. Res. 2017, 50, 487-491.
[3] Antonin Leblanc, Nicolas Mercier, Magali Allain, Jens Dittmer, Vincent Fernandez, Thierry Pauporté, Angew. Chem. 2017 Oct 27. doi: 10.1002/anie.201710021. Accepted manuscript.
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