Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.062
Publication date: 6th February 2020
Perovskite solar cells (PSCs) have achieved rapid improvement in efficiencies starting from 3.8% in 2009 to over 20% in 2018 within a short period. Due to their fast degradation, it is still a challenge to commercialize PSCs despite the promising enhancement in device efficiencies. Thus, it is necessary to probe the whole device in their operating condition to understand the degradation mechanism of each layer as well as intra-device reactions. In the present work, we have used laser desorption/ionization mass spectrometry (LDI-MS) to investigate the molecular interactions as well as the degradation products directly in complete perovskite solar cells. LDI-MS is a soft ionization process and has been used widely to analyze drugs, soft biological tissues, organometallic compounds, and thin films. By using this technique, we were able to observe chemical transformations such as corrosion of metal electrode, degradation of adjacent charge transport layers, incorporation of oxygen atoms into perovskite and formation of charge transfer complex between perovskite and hole transport layer [1]. We show that LDI-MS is a promising technique to observe intra-device reactions in PSCs. We believe our obtained results may shed light on the degradation mechanism inside PSCs which will, in turn, be helpful to increase the stability of the perovskite solar cells and make their commercialization feasible. In life science research, LDI-MS method has already become an inevitable analytical tool. We believe this method has the potential to benefit the field of solar cell studies as well.
Keywords: Laser desorption/ionization mass spectrometry, perovskite solar cells
Authors acknowledge The University of Auckland and Ministry of Business,Innovation and Employment (MBIE) New Zealand for funding the work.
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