Construction of photovoltaic cells based on Rhodobacter ... · Rafał Białek Rba. sphaeroides...
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Rafał Białek Rba. sphaeroides photovoltaics 1/17 Rafał Białek Adam Mickiewicz University in Poznań Faculty of Physics second year – molecular biophysics e-mail: [email protected] supervisor: Krzysztof Gibasiewicz Ph.D., D.Sc. Construction of photovoltaic cells based on Rhodobacter sphaeroides reaction centers
Transcript of Construction of photovoltaic cells based on Rhodobacter ... · Rafał Białek Rba. sphaeroides...
Rafał Białek Rba. sphaeroides photovoltaics 1/17
Rafał Białek Adam Mickiewicz University in Poznań
Faculty of Physics second year – molecular biophysics
e-mail: [email protected] supervisor: Krzysztof Gibasiewicz Ph.D., D.Sc.
Construction of photovoltaic cells based on Rhodobacter sphaeroides
reaction centers
Rafał Białek Rba. sphaeroides photovoltaics 2/17
Table of contents
• Introduction
– photosynthesis
– photovoltaics
• Methods
• Results
– kinetics
– spectra
• Summary
– first conclusions
– future plans
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Bacterial photosynthesis
Introduction Photosynthesis
Light-dependent reactions (with electron transfer)
ATP Biochemical processes
nutrients (e.g. carbohydrates)
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Electron transfer in Rba. sphaeroides RC
Introduction Photosynthesis
Source: Own elaboration
Reaction Center
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Chemical modification
Introduction Photosynthesis
Source: Own elaboration
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Triplet state formation
Introduction Photosynthesis
Source: Own elaboration
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Grätzel solar cell
Introduction Photovoltaics
Source: Grätzel M. (1999)
RCs
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Lukashev mechanism
Introduction Photovoltaics
Source: Own elaboration based on Lukashev E. P. et al. (2007) and Gibasiewicz K. et al. (2008)
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Stationary absorption spectrum
Methods Stationary absorption
Source: Gibasiewicz K. et al. (2009)
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Transient absorption spectrometer
Methods Transient absorption
Source: Own elaboration based on Burdziński G. PhD thesis (2003)
532nm
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Sample kinetics
Results Kinetics
laser impulse pin
long decay
non-decaying component
Source: Own data
ΔOD = Φ𝑇 ∙ 𝑁 ∙ 𝑙 ∙ 𝜀𝑇 − 𝜀𝑆
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Sample kinetics
Results Kinetics
ΔOD = Φ𝑇 ∙ 𝑁 ∙ 𝑙 ∙ 𝜀𝑇 − 𝜀𝑆
Source: Own data
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Monoexponential fit
Results Kinetics
𝑦 = 𝐴 ∙ 𝑒−𝑥𝑡1 + 𝑦0
𝑡0 = 150𝑛𝑠
Source: Own data
𝑡1 ≅ 4 − 5𝜇𝑠
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Light minus dark spectra
Results Spectra
Source: Own data
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First conclusions and plans
• Triplet minus singlet spectra of all samples have similar shape.
• Time constants of decay are in close agreement with literature data.
• The quick pin makes it impossible to analyse quick parts of the decay.
• Mutants for constructing photovoltaic cells were chosen.
• Isolated RCs of chosen mutants are prepared.
• First photovoltaic cell will be produced in few weeks.
Summmary Conclusions
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Acknowledgements
Rafał Białek Rba. sphaeroides photovoltaics 17/17
Rafał Białek Adam Mickiewicz University in Poznań
Faculty of Physics
second year – molecular biophysics
e-mail: [email protected]
supervisor: Krzysztof Gibasiewicz Ph.D., D.Sc.
Thank you for your attention
