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Nanosecond response of organic solar cells and photodetectors
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Image of FIG. 1.
FIG. 1.

Schematic structure of the studied OSC and the corresponding electric circuit for contacting. The solar cell consists of the absorbing layer P3HT:PCBM nestled between the Al cathode and the anode consisting of a PEDOT:PSS layer deposited on top of ITO (nonscale division). A high-frequency test probe is employed for contacting. The depicted external resistance is given by the input resistance of the oscilloscope and the contact resistance of the electrodes.

Image of FIG. 2.
FIG. 2.

Schematic description of the free charge carrier generation in organic polymer/fullerene blends. Generation (1) of an exciton by an incident photon, dissociation at internal interfaces (2) and drifting of the free charge carriers in the built-in electric field to the anode or cathode, respectively (3).

Image of FIG. 3.
FIG. 3.

Spatial distribution of the square of the absolute value of the electric field. Light is incident from the left. The highlighted area describes the absorbing layer P3HT:PCBM.

Image of FIG. 4.
FIG. 4.

Simulation of the normalized photoresponse after irradiation of a laser pulse. Additionally, the conduction current density is plotted. The normalization value was taken to be same as for . The chosen simulation parameters are our standard values employed for the simulations, which are declared in Table I. The measured temporal characteristic of the applied Gaussian-shaped laser pulse is pictured in the inlet.

Image of FIG. 5.
FIG. 5.

Spatial distribution of the electron density, the hole density, and the electric field in the absorbing P3HT:PCBM layer at two different times. Between the spatially separated charge carriers the electric field is lowered, resulting in a slow charge carrier extraction.

Image of FIG. 6.
FIG. 6.

Normalized photoresponse for different electron mobilities . The applied voltage is and the hole mobility is taken to be .

Image of FIG. 7.
FIG. 7.

Comparison of the photoresponse for different diameters. The laser intensity is slightly different for each device being for the device with a diameter of , for , and for . The applied voltage is for all three diameters.

Image of FIG. 8.
FIG. 8.

Comparison of the photoresponse of simulations and measurements under variation in the laser intensity. The applied voltage is and the diameter is .

Image of FIG. 9.
FIG. 9.

Comparison of simulation and measurements under variation in the applied voltage for a laser intensity of and a diameter of .


Generic image for table
Table I.

Basic set of parameters used for the simulation in Sec. VI.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanosecond response of organic solar cells and photodetectors