ingredients of a good scientific talk justin hodgkiss scps postgraduate workshop 15 january 2013
TRANSCRIPT
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Ingredients of a good scientific talk
Justin HodgkissSCPS postgraduate workshop
15 January 2013
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Goal
To get the audience to appreciate your science story
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What’s the story?
Be very clear in your head before making slides
DistilDistil
Distil
1 sentence?
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What’s the story?
Be very clear in your head before making slides
Where are you going?
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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
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Value the first minute
One chance to hook the audience – don’t blow it!
Must be stimulating
Get to the point
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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
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Light absorption triggers a cascade if photophysical processes in OPVs
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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.
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Charge separation prior to exciton formation?
Delocalized excitation
Ground state
Localized exciton
Separated chargesThermalization(sub ps)
Fluorescence
hn
‘Hot CT’
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Ultrafast formation of free charges
1. Charge delocalization dynamics via time resolved absorption cross-section
2. Role of the exciton via ultrafast photoluminescence
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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.
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……….. ………
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Ultrafast formation of free charges
1. Charge delocalization dynamics via time resolved absorption cross-section
2. Role of the exciton via ultrafast photoluminescence
![Page 15: Ingredients of a good scientific talk Justin Hodgkiss SCPS postgraduate workshop 15 January 2013](https://reader036.vdocuments.site/reader036/viewer/2022062421/56649ce05503460f949aa220/html5/thumbnails/15.jpg)
Each slide makes a point
• Clean, minimal, balanced
• Clear, relevant graphics
• Large font
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Growth in charge absorption tracks PL decay
These charges are formed via bound emissive excitons
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Clarity is key
• Use every means to make it EASY TO FOLLOW
–Colour coding
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Light absorption triggers a cascade if photophysical processes in OPVs
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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.
![Page 20: Ingredients of a good scientific talk Justin Hodgkiss SCPS postgraduate workshop 15 January 2013](https://reader036.vdocuments.site/reader036/viewer/2022062421/56649ce05503460f949aa220/html5/thumbnails/20.jpg)
Clarity is key
• Use every means to make it EASY TO FOLLOW
– Colour coding
– Repeated imagery
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Evidence for charge separation prior to exciton formation
Delocalized excitation
Ground state
Localized exciton
Separated chargesThermalization(sub ps)
Fluorescence
hn
‘Hot CT’
![Page 22: Ingredients of a good scientific talk Justin Hodgkiss SCPS postgraduate workshop 15 January 2013](https://reader036.vdocuments.site/reader036/viewer/2022062421/56649ce05503460f949aa220/html5/thumbnails/22.jpg)
Clarity is key
• Use every means to make it EASY TO FOLLOW
– Colour coding
– Repeated imagery
– Eliminate jargon
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Practice, practice, practice
• Out loud (record)
• KEEP TO TIME
• Remember:– Key point of each slide– Transitions– Crucial concepts to emphasize…. Slow down
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Preparations on the day• Multiple copies (USB, dropbox, email…), + printout
• .pdf version
• Check display, animation, video’s, lighting, Mac??
• Pointer
• Timer
• Where to stand?
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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
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Reflect on the best and worst talks you’ve seen
… best and worst talks you’ve given?