Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Fundamentals of Perovskite Photovoltaics I (joint session CPP/DS/HL)

CPP 3.1: Invited Talk

Monday, March 20, 2017, 10:15–10:45, ZEU 222

The Versatility of Mesoscopic Solar Cells — •Anders Hagfeldt — Laboratory of Photomolecular Science, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland

In our work on solid-state dye-sensitized solar cells (ssDSSC) we have recently [1] shown that copper phenanthroline complexes can act as an efficient hole transporting material, achieving power conversion efficiencies of more than 11%.

In our work on perovskite solar cells (PSC) we have achieved efficiencies above 20% with a mixed composition of iodide/bromide and methyl ammonium/formamidinium. With the use of SnO2 compact underlayers as electron acceptor contacts we have constructed planar perovskite solar cells with a hysteresis free efficiency above 20% [2]. We have taken the cation mixing of the perovskite film further by including Cs+ and Rb+. Larger grains grown in a monolithic manner are observed and for example reproducibility and device stability are improved [3]. At the meeting we will discuss our champion data; up to 22% efficiency with an external electroluminescence of 4%, and an outstanding open-circuit voltage of 1.24 V at a band gap of 1.63 eV. Furthermore, we will report a breakthrough in stability at 85 oC for 500 h under full solar illumination.

References [1]*Freitag et al., Energy & Envir. Sci., DOI: 10.1039/C5EE1204J [2]*Correa et al., Energy & Envir. Sci., DOI:10.1039/C5EE02608C [3]*M. Saliba et al., Science 10.1126/science.aah5557 (2016)