Dear all,
Please join us for our next CPE Sustainable Energy Materials seminar on Thursday the 25th of March at 3 pm:
Transient Optoelectronic Validity and Analysis of Charge Carrier Dynamics in Organic and Perovskite Photovoltaics
by Dr Jiaying Wu
Research associate, Durrant group, Department of Chemistry
Talk abstract: Solution-processable semiconductors offer the potential for the scalable manufacturing of low-cost, lightweight and flexible photovoltaic devices. In particular, solution processed solar cells based on both organic semiconductors and organic-inorganic hybrid metal halide perovskites have recently shown rapid improvements in photovoltaic performance. Here I will introduce transient optoelectronic techniques, in particular transient photovoltage (TPV) and transient charge extraction (CE), that applied to measure the charge carrier dynamics of optoelectronic devices, and discuss the validity of measured results and their limitations. Then I will show what learned from the transient optoelectronic results for a wide range of organic solar cells and organic-inorganic hybrid metal halide perovskite solar cells, two leading technologies in thin-film photovoltaics. I will discuss the similarities and differences on charge transport, charge collection and charge recombination in these two technologies, linking back to materials properties and device architecture influence of both techniques, and elucidate how these factors impact on photovoltaic device performance.
Speaker bio: Dr Jiaying Wu obtained her PhD in research on material photophysics and device physics under the supervision of Prof. James R Durrant FRS. Since 2019 finished her PhD study, she started working as a postdoctoral researcher in Durrant group continuing her research. Her current research is focused on charge carrier dynamics analysis using transient optoelectronic techniques to study charge carrier transport, recombination and extraction mechanisms in optoelectronic devices. Prior to her PhD study in 2015, she obtained her MRes in Nanomaterials in 2014 under the supervision of Prof.James R Durrant FRS and Dr Stoichko Dimitrov. Before that, she received her bachelor degree in 2013 from the University of Electronics Science and Technology of China (UESTC) in solid state electronics.
Related publications:
1. Wu, J. et al. (2020) ‘Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells’, Energy & Environmental Science, 13(8), p.2422-2430
2. Wu, J. et al. (2019) ‘Tail state limited photocurrent collection of thick photoactive layers in organic solar cells’, Nature Communications, 10(1), 5159
3. Lin, Y. et al. (2020) ‘A piperidinium salt stabilizes efficient metal-halide perovskite solar cells’, Science, 369(6499), pp. 96–102
4. Cha, H., Wu, J. et al. (2017) ‘An Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor’, Advanced Materials, 29(33), 1701156
5. Lee, H. K. H., Wu, J., et al. (2018) ‘Organic photovoltaic cells – promising indoor light harvesters for self-sustainable electronics’, Journal of Materials Chemistry A, 6(14), p. 5618– 5626
About the SustEM seminar series: The SustEM seminars feature talks by senior Ph.D. students, postdocs, and early-career research fellows. We would like to invite speakers working on sustainable energy materials not only within the CPE, but also from other relevant groups across the College. Please spread the word to groups working on sustainable energy materials and let us know if you are interested in giving a talk!
We have started a new distribution list for notifications of upcoming CPE seminars. If you know of anyone not receiving these emails, please send their details to: processable-electronics@imperial.ac.uk and they’ll be added to the list.
Best regards,
SustEM organising committee
Yifan, Michael and Ludmilla