Abstract
In this paper, we report on investigation uses a method of calculation the photocurrent delivered by the organic solar cell double-layer MPP/ZnPc applying the equations of continuities and the currents by analogy to the phenomena of loads transport according to the model of an heterojunction n/p. The principal generation of the photocurrent is localized in the active zone, a very fine area by contribution with the thicknesses of the donor and acceptor layers. Thus let us that the excitons dissociate only in the MPP/ZnPc interface, whereas the zone of absorption is considerably larger than the diffusion length. The principal photovoltaic parameters of this structure are calculated by the simulation of equation I(V), under illumination AM1. 5. Insertion of the composite layer C60 and ZnPc in the interface of MPP and ZnPc makes it possible to improve the performances of the cell by an increase in the photocurrent of the value 2.6 mA/cm 2 to 5.3 mA/cm 2 and the conversion efficiency η from 0,72% to 1,49%. We worked out a numerical model based on resolution of equations of continuities who gave results in good accordance with literature and which allowed, moreover a better control of performances of organic cells, for their improvement.
Highlights
Molecular electronics is a quickly developing field and the organic conducting materials were employed like active medium in the optoelectronic devices such as the luminescent diodes (LED), the field-effect transistors, sensors, lasers, the photodiodes and the solar cells
Two types of organic solar cells were intensively studied: those built with a stacking of two organic layers and the others which use a built composite layer of a homogeneous mixture of two materials of the cell
The absorption for the double-layer structure represented on is carried out in the two layers. In this configuration only the excitons generated in the vicinity of the interface are effective for the generation of the photocurrent, this photocurrent is the sum of the current generated on the level of donor and the current in the acceptor
Summary
N n ne Density of excitons generated (electrons), ne: density in balance. N Life time of minority carriers of area p (electrons). P Lifespan of minority carriers of area n (holes). Φi(λ) Flux of incidents photons by cm-2 by s-1 by unit of wavelength. Sp, Speed of recombination of the holes on the surface. Α2, Absorption coefficient in ZnPc. Sn, Speed of recombination of the electrons to the back contact. Ln Diffusion length of the electrons I, Current ICC , Short-circuit current J , Current density V , Tension VOC , Open circuit tension.
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