Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 2, Issue 19, Pages 2407-2411Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz201104d
Keywords
-
Categories
Funding
- EPSRC
- Supergen
- Apex
- Merck
- Royal Society
- Imperial College
- EPSRC [EP/H040218/2, EP/H040218/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H040218/1, EP/H040218/2] Funding Source: researchfish
Ask authors/readers for more resources
We address the claim that the dependence of the corrected photocurrent (defined as the difference between the light and dark currents) upon light intensity can be used to determine the charge recombination mechanism in an organic solar cell. We analyze a poly(3-hexylthiophene):[6,6]-phenyl C61-butyric acid methyl ester (P3HT:PCBM) device using corrected photocurrent and transient photovoltage experiments and show that whereas the corrected photocurrent is linear in light intensity the charge recombination rate scales superlinearly with charge carrier density. We explain this apparent discrepancy by measuring the charge carrier densities at different applied voltages and light intensities. We show that it is only safe to infer a linear recombination mechanism from a linear dependence of corrected photocurrent on light intensity under the following special conditions: (i) the photogenerated charge carrier density is much larger than the dark carrier density and (ii) the photogenerated carrier density is proportional to the photogeneration rate. SECTION: Electron Transport, Optical and Electronic Devices, Hard Matter
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available