Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
The accurate photophysical characterisation of a material is not a straightforward task. The complexity increases when working with solid state samples that have low signals, low transmittance and vary with time, etc. Such materials suffer from data irreproducibility, low signal to noise ratio, and often require longer measurements. Perovskite materials for use in solar cells – the focus of our research – suffer from most of these characteristics.
However, spectroscopic techniques are very powerful, currently enabling, for example, the further understanding of solar cells degradation mechanisms,1 estimate hole/electron transfer kinetics/yields2 and evaluate oxygen diffusion3 which can then be easily extrapolated to real photovoltaic devices and used to design new and improved materials.
Due to the potential of these techniques, the complex nature of perovskite materials and the multidisciplinarity in this field, we are invested in the development of accurate methodologies and appropriate experiments as well as on investigating approaches to perform reliable comparisons between samples.
In this work, we will focus on the custom designed improvement of our epifluorescence microscope. These recent developments have been supported with data from other techniques such as UV-VIS-NIR spectrophotometry, steady-state fluorescence and transient absorption spectroscopy. Our setup can, at present, perform up to six measurements (excitation intensity, fluorescence emission spectra, fluorescence image, temperature, % relative humidity and % transmittance) simultaneously with the advantage of being able to measure over long periods of time and under different ambient conditions (temperature, humidity and under different gases with controlled flow) helping understand the data variability.
This study presents the methodology and reproducibility of our approach allowing consistent insight into the stability of perovskite materials exposed to various controlled environments.
References
[1]. O'Mahony, F. T. F.; Lee, Y. H.; Jellett, C.; Dmitrov, S.; Bryant, D. T. J.; Durrant, J. R.; O'Regan, B. C.; Graetzel, M.; Nazeeruddinb M. K.; Haque S. A. J. Mater. Chem. A, 2015, 3, 7219.
[2]. Li, Y.; Yan, W.; Li, Y.; Wang, S.; Wang, W.; Bian, Z.; Xiao, L.; Gong, Q. Scientific Reports. 2015, 5, 14485.
[3]. Shoaee, S.; Durrant, J. R. J. Mater. Chem. C, 2015, 3, 10079.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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