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Understanding the Thickness-Dependent Performance of Organic Bulk Heterojunction Solar Cells: The Influence of Mobility, Lifetime, and Space Charge
Abstract
We investigate the reasons for the dependence of photovoltaic performance on the absorber thickness of organic solar cells using experiments and drift-diffusion simulations. The main trend in photocurrent and fill factor versus thickness is determined by mobility and lifetime of the charge carriers. In addition, space charge becomes more and more important the thicker the device is because it creates field free regions with low collection efficiency. The two main sources of space-charge effects are doping and asymmetric mobilities. We show that for our experimental results on Si-PCPDTBT:PC71BM (poly[(4,40-bis(2-ethylhexyl)dithieno[3,2-b:20,30-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,50-diyl]:[6,6]-phenyl C71-butyric acid methyl ester) solar cells, the influence of doping is most likely the dominant influence on the space charge and has an important effect on the thickness dependence of performance.
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Cited by
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Zhang, G., Zhang, K., Yin, Q., Jiang, X.-F., Wang, Z., Xin, J., Ma, W., Yan, H., Huang, F., & Cao, Y. (2017) · Journal of the American Chemical Society · doi:10.1021/jacs.6b11991 · Cited by 435
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Metadata
- Authors
- Kirchartz, T., Agostinelli, T., Campoy-Quiles, M., Gong, W., & Nelson, J.
- Venue
- The Journal of Physical Chemistry Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-11-14
- Volume
- 3
- Issue
- 23
- Pages
- 3470-3475
- ISSN
- 1948-7185 (ISSN-L)
- OpenAlex
- W2314482289
- Cited by
- 264
- References
- 0
- FWCI
- 14.24
- Type
- journal article
- Language
- en
- Open access
- closed
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- Kirchartz, T., Agostinelli, T., Campoy-Quiles, M., Gong, W., & Nelson, J. (2012). Understanding the Thickness-Dependent Performance of Organic Bulk Heterojunction Solar Cells: The Influence of Mobility, Lifetime, and Space Charge. The Journal of Physical Chemistry Letters. https://doi.org/10.1021/jz301639y
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