| Summary: | The visualization of exciton density profile in the heterojunction organic
solar cell device based on phthalocyanine (CuPc) and perylene (PTCBI) has been
made based on the exciton diffusion equation. For this purpose, the finite
difference numerical method was applied for time independent exciton density,
while the Crank Nicolson method was applied for time dependent exciton density.
This study is the improvement of the previous visualization because of involving
the process of dissociation at the donor-acceptor interface, interference effects
within the device, and the finite structure of a thin films device.The wavelength
effect of incident light to the exciton density profile were observed at the
wavelength that correlated to the peak and valley of absorbance spectrum
coefficient of CuPc and PTCBI.
The result shows that after involving the three parameters above, the
exciton density profiles is more spread and higher than that of without involving
the parameters. Moreover, the time dependent of exciton density profile shows the
peak that is lower than that of independent one. Furthermore, it is found that the
photocurrent density is contributed significantly by the PTCBI layer rather than
CuPc layer at the wavelength of 535 nm. The highest incident photon to current
efficiency for the independent time exciton density and dependent time exciton
density were given by 58,54 % and 23,47 %, respectively.
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