Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Humidity Induced Degradation via Grain Boundaries of HC(NH2)2PbI3 Planar Perovskite Solar Cells
Jae S. Yun¶,*,1, Jincheol Kim¶,1, Trevor Young1, Rob Patterson1, Hongze Xia1, Dohyung Kim2, Jan Seidel2, Sean Lim3, , Sheng Chen1, Martin A. Green1, Shujuan Huang1, and Anita Ho-Baillie1,*
1Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable and Engineering, University of New South Wales, Sydney 2052, Australia
2School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
3Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052, Australia
†Correspondence to: j.yun@unsw.edu.au and a.ho-baillie@unsw.edu.au
¶These authors contributed equally.
Abstract: The sensitivity of organic-inorganic perovskites to environmental factors remains a major barrier for these materials to become commercially viable for photovoltaic applications. In this work, the degradation of formamidinium lead iodide (FAPbI3) perovskite to moisture is systematically investigated. We show that the level of relative humidity (RH) is important for the onset of degradation processes. Below 30% of RH, the black phase of the FAPbI3 perovskite shows excellent phase stability over 90 days. Once the RH reaches 50%, degradation of the FAPbI3 perovskite occurs rapidly. Results from Kelvin probe force microscopy (KPFM) study reveal that the formation of non-perovskite phases initiate at the grain boundaries and that ion migration along the grain boundaries is greatly enhanced upon degradation. We developed a post thermal treatment (PTT) that removes chemical residues at the grain boundaries which effectively slows the degradation process. Finally, it was demonstrated that the PTT process improves the performance and stability of the final device.
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