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Charge Generation Dynamics in CdS:P3HT Blends for Hybrid Solar Cells
Ute B Cappel1, Simon A Dowland1, Luke X Reynolds1
1Department of Chemistry, Imperial College London, South Kensington Campus, Exhibition Road, South Kensington, United Kingdom.
The Journal of Physical Chemistry Letters
|August 22, 2015
Summary
Understanding charge dynamics in hybrid solar cells is key to improving efficiency. Exciting the inorganic component yields efficient charge generation, while organic component excitation faces recombination losses.
Area of Science:
- Materials Science
- Photovoltaics
- Charge Dynamics
Background:
- Improving solar cell conversion efficiency requires understanding charge generation and recombination in hybrid inorganic-organic systems.
- Design rules for these cells depend on detailed knowledge of photophysical processes.
Purpose of the Study:
- To investigate charge generation dynamics in cadmium sulfide (CdS):polymer blends.
- To elucidate the mechanisms and timescales of charge generation following excitation of either component.
Main Methods:
- Transient absorption spectroscopy was employed to study charge generation dynamics.
- The study focused on CdS:polymer blends to analyze charge carrier behavior.
Main Results:
- Charge generation in the inorganic CdS component is highly efficient, occurring within nanoseconds.
- Excitation of the organic polymer component leads to rapid charge generation (subpicosecond) but is hindered by incomplete exciton dissociation and geminate recombination.
- These findings highlight distinct charge generation pathways and loss mechanisms for each component.
Conclusions:
- Efficient charge generation in the inorganic component allows for charge diffusion to interfaces.
- Loss processes in the organic component limit overall device performance.
- Understanding these dynamics is crucial for developing effective design rules for hybrid solar cells.
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