Organic–inorganic lead halide perovskites have shown photovoltaic performances above 20% in a range of solar cell architectures while offering simple and low-cost processability. Despite the multiple ionic compositions that have been reported so far, the presence of organic constituents is an essential element in all of the high-efficiency formulations, with the methylammonium and formamidinium cations being the sole efficient options available to date. In this study, we demonstrate improved material stability after the incorporation of a large organic cation, guanidinium, into the MAPbI3 crystal structure, which delivers average power conversion efficiencies over 19%, and stabilized performance for 1,000 h under continuous light illumination, a fundamental step within the perovskite field.

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We thank the European Commission H2020-ICT-2014-1, SOLEDLIGHT project, grant agreement no. 643791, the Swiss State Secretariat for Education, Research and Innovation (SERI) and Toyota Motor Europe Technical Center, Advanced Technology division, Home Wei 33, B-1930 Zaventem-Belgium for financial support. G.G. acknowledges the co-funded Marie Skłodowska Curie fellowship, H2020 grant agreement no. 665667, fund number 588072, and the SNSF Ambizione Energy grant SNF project PZENP2_173641. G.M. thanks the Ministry of Economy and Competitiveness for a ‘Ramón y Cajal’ contract (RYC-2013-12772). G.M. and L.C. acknowledge the Ministry of Economy and Competitiveness for financial support (CTQ2014-56422-P). A.D.J. thanks COST-STSM-MP1307 for financial support. Work in Berlin was supported by the SFB951 (DFG). We thank E. Oveisi and E. Baudat for the helpful discussions, L. Wen for his support during the XPS measurement and M. Tschumi for providing the instrument required for the stability measurements.

Author information


  1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland

    • Alexander D. Jodlowski
    • , Cristina Roldán-Carmona
    • , Giulia Grancini
    • , Manuel Salado
    •  & Mohammad Khaja Nazeeruddin
  2. Departamento de Química Física y Termodinámica Aplicada, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUQFN, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba, Spain

    • Alexander D. Jodlowski
    • , Luis Camacho
    •  & Gustavo de Miguel
  3. Abengoa Research, Abengoa, C/ Energía Solar no. 1, Campus Palmas Altas, Sevilla, Spain

    • Manuel Salado
    •  & Shahzada Ahmad
  4. Humboldt-Universität zu Berlin, Institut für Physik & IRIS Adlershof, Berlin, Germany

    • Maryline Ralaiarisoa
    •  & Norbert Koch
  5. Helmholtz-Zentrum Berlin für Materialien und Energie, Devision Renewable Energies, Berlin, Germany

    • Maryline Ralaiarisoa
    •  & Norbert Koch


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A.D.J. planned the experiments and prepared and characterized the cells; M.S. performed the impedance measurements and analysis; S.A. supervised M.S.; G.M. performed the XPS, XRD and absorption analysis; G.G. carried out the Raman and PL characterization; C.R.-C. designed the experiments, carried out the SEM analysis and wrote the manuscript; L.C. performed the theoretical simulations; M.R. and N.K. performed UPS and XPS analysis; C.R.-C., G.M., L.C. and M.K.N. conceived the idea, and supervised the research project.

Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to Cristina Roldán-Carmona or Gustavo de Miguel or Mohammad Khaja Nazeeruddin.

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  1. Supplementary Information

    Supplementary Figures 1–14, Supplementary Tables 1–2, Supplementary Notes 1–2, Supplementary References.

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