Investigation of the Photocurrent in Bulk Heterojunction Solar Cells

Details Investigation of the Photocurrent in Bulk Heterojunction Solar Cells Investigation of the Photocurrent in Bulk Heterojunction Solar Cells

2010-01-14

arxiv.org/abs/1001.2546v1

Phys. Rev. B 81, 085203 (2010)

Physics

Condensed Matter

Materials Science

6 pages, 7 figures

Scientific paper

10.1103/PhysRevB.81.085203

We investigated the photocurrent in poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl-C$_{61}$ butyric acid methyl ester (PCBM) solar cells by applying a pulsed measurement technique. For annealed samples, a point of optimal symmetry (POS) with a corresponding voltage $V_\text{POS}$ of 0.52--0.64 V could be determined. Based on macroscopic simulations and results from capacitance--voltage measurements, we identify this voltage with flat band conditions in the bulk of the cell, but not the built-in voltage as proposed by [Ooi et al., J. Mater. Chem. 18 (2008) 1644]. We calculated the field dependent polaron pair dissociation after Onsager--Braun and the voltage dependent extraction of charge carriers after Sokel and Hughes with respect to this point of symmetry. Our analysis allows to explain the experimental photocurrent in both forward and reverse directions. Also, we observed a voltage--independent offset of the photocurrent. As this offset is crucial for the device performance, we investigated its dependence on cathode material and thermal treatment. From our considerations we gain new insight into the photocurrent`s voltage dependence and the limitations of device efficiency.

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