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Ingredients of a good scientific talk. Justin Hodgkiss SCPS postgraduate workshop 15 January 2013. Goal. To get the audience to appreciate your science story. What’s the story?. Be very clear in your head before making slides. Distil Distil Distil. 1 sentence?. What’s the story?. - PowerPoint PPT Presentation
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Ingredients of a good scientific talk
Justin HodgkissSCPS postgraduate workshop
15 January 2013
Goal
To get the audience to appreciate your science story
What’s the story?
Be very clear in your head before making slides
DistilDistil
Distil
1 sentence?
What’s the story?
Be very clear in your head before making slides
Where are you going?
Choose structure to fit the story
Think creatively
What does audience need to know to appreciate story?
Don’t be constrained by:- Structure used by everyone else- Your previous talks- desire to include everything you know
Value the first minute
One chance to hook the audience – don’t blow it!
Must be stimulating
Get to the point
Outline• Introduction to organic solar cells
- Excitons- Charge generation
• Experimental methods- Optical Kerr gate- Transient absorption spectroscopy
• Results- Exciton dynamics- Measurement of cross-sections
• Conclusions
• Acknowledgements
Light absorption triggers a cascade if photophysical processes in OPVs
Exciton diffusion coefficients (10-3 cm2 s-1 for P3HT) only ~0.1 nm in 100 fs
Adv. Mat. 20 (18): 3516-3520
Optimized domains ~10-20 nm
100nm
Adv. Funct. Mat., 15(10): 1617-1622.
Exciton bottleneck – model must be wrong!
Free charge carrier generation within 40 fs after photoexcitation
Physical Review Letters 108(5): 056603.
Charge separation prior to exciton formation?
Delocalized excitation
Ground state
Localized exciton
Separated chargesThermalization(sub ps)
Fluorescence
hn
‘Hot CT’
Ultrafast formation of free charges
1. Charge delocalization dynamics via time resolved absorption cross-section
2. Role of the exciton via ultrafast photoluminescence
Ultrafast formation of free charges
1. Charge delocalization dynamics via time resolved absorption cross-section
Friend, R. H. et. al. Science, 2012, 335, 1340-1344.
……….. ………
Ultrafast formation of free charges
1. Charge delocalization dynamics via time resolved absorption cross-section
2. Role of the exciton via ultrafast photoluminescence
Each slide makes a point
• Clean, minimal, balanced
• Clear, relevant graphics
• Large font
Growth in charge absorption tracks PL decay
These charges are formed via bound emissive excitons
Clarity is key
• Use every means to make it EASY TO FOLLOW
–Colour coding
Light absorption triggers a cascade if photophysical processes in OPVs
Exciton diffusion coefficients (10-3 cm2 s-1 for P3HT) only ~0.1 nm in 100 fs
Adv. Mat. 20 (18): 3516-3520
Optimized domains ~10-20 nm
100nm
Adv. Funct. Mat., 15(10): 1617-1622.
Exciton bottleneck – model must be wrong!
Free charge carrier generation within 40 fs after photoexcitation
Physical Review Letters 108(5): 056603.
Clarity is key
• Use every means to make it EASY TO FOLLOW
– Colour coding
– Repeated imagery
Evidence for charge separation prior to exciton formation
Delocalized excitation
Ground state
Localized exciton
Separated chargesThermalization(sub ps)
Fluorescence
hn
‘Hot CT’
Clarity is key
• Use every means to make it EASY TO FOLLOW
– Colour coding
– Repeated imagery
– Eliminate jargon
Practice, practice, practice
• Out loud (record)
• KEEP TO TIME
• Remember:– Key point of each slide– Transitions– Crucial concepts to emphasize…. Slow down
Preparations on the day• Multiple copies (USB, dropbox, email…), + printout
• .pdf version
• Check display, animation, video’s, lighting, Mac??
• Pointer
• Timer
• Where to stand?
Relax and enjoy the moment
• Easy if you’re well prepared!
• Time flies
• Don’t panic if you forget something……. Just slow down and keep it simple
Reflect on the best and worst talks you’ve seen
… best and worst talks you’ve given?