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Enhanced Performance of Germanium Halide Perovskite Solar Cells through Compositional Engineering

Indira KopacicInstitute for Chemistry and Technology of Materials (ICTM), NAWI Graz, Graz University of Technology, Stremayrgasse 9, 8010 Graz, AustriaBastian FriesenbichlerInstitute for Chemistry and Technology of Materials (ICTM), NAWI Graz, Graz University of Technology, Stremayrgasse 9, 8010 Graz, AustriaSebastian F. HoeflerInstitute for Chemistry and Technology of Materials (ICTM), NAWI Graz, Graz University of Technology, Stremayrgasse 9, 8010 Graz, AustriaBirgit KunertInstitute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, AustriaHarald PlankInstitute for Electron Microscopy and Nanoanalysis, Graz University of Technology & Centre for Electron Microscopy Graz, Steyrergasse 17, 8010 Graz, AustriaThomas RathInstitute for Chemistry and Technology of Materials (ICTM), NAWI Graz, Graz University of Technology, Stremayrgasse 9, 8010 Graz, AustriaGregor TrimmelInstitute for Chemistry and Technology of Materials (ICTM), NAWI Graz, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria

2018en

ABI

Annotatsiya

Germanium halide perovskites are an attractive alternative to lead perovskites because of their well-suited optical properties for photovoltaic applications. However, the power conversion efficiencies of solar cells based on germanium perovskites remained below 0.2% so far, and also, the device stability is an issue. Herein, we show that modifying the chemical composition of the germanium perovskite, i.e., introducing bromide ions into the methylammonium germanium iodide perovskite, leads to a significant improvement of the solar cell performance along with a slight enhancement of the stability of the germanium perovskite. With substitution of 10% of the iodide with bromide, power conversion efficiencies up to 0.57% were obtained in MAGeI2.7Br0.3 based solar cells with a planar p–i–n architecture using PEDOT:PSS as hole and PC70BM as electron transport layer.

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Identifikatorlar

DOI: 10.1021/acsaem.8b00007

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