Combined influence of carrier mobility and dielectric constant on the performance of organic bulk heterojunction solar cells
It has been shown that there is an optimum charge carrier mobility that leads to a peak in the efficiency for organic bulk heterojunction solar cells with mobility-dependent recombination rate. Hence, improving the mobility is considered as one of the ways to increase the efficiency. In this stud...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/47083/ http://irep.iium.edu.my/47083/ http://irep.iium.edu.my/47083/ http://irep.iium.edu.my/47083/1/AIP_Advances_4%2C_057133_%282014%29.pdf |
| Summary: | It has been shown that there is an optimum charge carrier mobility that leads to a peak
in the efficiency for organic bulk heterojunction solar cells with mobility-dependent
recombination rate. Hence, improving the mobility is considered as one of the ways to
increase the efficiency. In this study, we investigate the combined influence of charge
carrier mobility and dielectric constant on the performance of organic bulk heterojunction
solar cells by performing drift-diffusion calculations. We find that a higher
dielectric constant leads to a higher peak efficiency together with a lower optimum
mobility. We also find that if the dielectric constant of the active material can be increased
significantly (to around 8 or higher), it is then possible that the mobility of the
active material need not to be improved in order to achieve the maximum efficiency.
This study demonstrates the importance of knowing the interplay between the mobility
and the dielectric constant with regard to the efficiency. C 2014 Author(s). All
article content, except where otherwise noted, is licensed under a Creative Commons
Attribution 3.0 Unported License. |
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