Enhanced Performance of Germanium Halide Perovskite Solar Cells through Compositional Engineering

Indira Kopacic, Bastian Friesenbichler, Sebastian Franz Höfler, Birgit Kunert, Harald Plank, Thomas Rath*, Gregor Trimmel

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

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.
Originalspracheenglisch
Seiten (von - bis)343-347
Seitenumfang5
FachzeitschriftACS Applied Energy Materials
Jahrgang1
Ausgabenummer2
DOIs
PublikationsstatusVeröffentlicht - 2018

Fields of Expertise

  • Advanced Materials Science

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