Nano Archive

Theoretical determination of the optimum thickness of perylene layer in bilayer phthalocyanine/perylene photovoltaic device

Pratiwi, H. and Siahaan, T. and Satriawan, M. and Nurwantoro, P. and Triyana, K. (2009) Theoretical determination of the optimum thickness of perylene layer in bilayer phthalocyanine/perylene photovoltaic device. In: AIP Conference Proceedings.

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Abstract

We do theoretical study on thickness of the active layers in a heterojunction bilayer thin film photovoltaic device based on copper phthalocyanine (CuPc)/perylene that gives the highest incident photon to current efficiency (IPCE). The device we study consists Glass (1 mm)/ITO (Indium Tin Oxide, 120 nm)/CuPc (50 nm)/PTCDA (3,4,9,10 perylenetetracarboxylic dianhydride, x nm)/Ag (40 nm), where x is the thickness of the PTCDA layer that we calculate here. The calculation is based on assumption that the photocurrent generation process is the result of the creation of photogenerated excitons, which difuse before dissociated at the CuPc/PTCDA interface following the diffusion equation, by internal optical electric field that comes from light exposure. We also assume that almost all photocurrent is created in the CuPc/PTCDA interface. Because the order of the thickness of the active layers is the same or smaller than of the wavelength of visible light, we take into account the effect of reflection and interference in the calculation of internal optical electric field distribution inside the device by making use complex indices of refraction of the active materials in our calculation. The modulus of it is proportional with the number generated excitons. The general solution of the exciton diffusion equation was used for calculating the photocurrent and the IPCE. Here, we find the optimum thickness of PTCDA layer that gives greatest IPCE at the wavelength of 344 nm and 467 nm, which are the wavelengths at which the absorption coefficients of CuPc and PTCDA, respectively, reach the maximum values.

Item Type:Conference or Workshop Item (Paper)
Subjects:Material Science > Functional and hybrid materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:8242
Deposited By:CSMNT
Deposited On:10 Feb 2010 13:58
Last Modified:17 Feb 2010 05:06

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