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OPV Lab

By Biswajit Ray1, Camila Andrea González Williamson2, Mohammad Ryyan Khan1, Muhammad Alam1

1. Purdue University 2. Universidad de Los Andes

Simulation tool for organic solar cells

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Archive Version 1.0
Published on 04 Oct 2011
Latest version: 1.1. All versions

doi:10.4231/D3G15T972 cite this

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Abstract

OPV tool is an excellent educational resource for the understanding and analysis of the operation of organic solar cells. The tool simulates the current-voltage (I-V) characteristics of organic solar cells with bilayer or planar heterojunction morphology. The following procedure is followed to get the I-V characteristics:

1) Optical absorption inside the device is calculated by the transfer matrix method. The absorption profile depends on the complex refractive indices and the thickness of various layers in the cell.

2) Exciton diffusion equation is then solved in both donor and acceptor layers. Exciton concentration at the donor-acceptor interface is set to zero with the assumption that dissociation probability is high and field independent.

3) Charged carrier transport is simulated by the self consistent solution of drift-diffusion and Poisson equation. Generation term in the carrier continuity equation is calculated from exciton diffusion profile and the recombination at the D-A interface is implemented by bi-molecular mechanism. We ignore geminate recombination at the interface.

The tool not only simulates the I-V characteristics but also calculates the solar cell performance matrices such as efficiency, short circuit current, open circuit voltage, and fill factor. The tool also plots the photon absorption profile, charged carrier distribution, electric field, and energy bands inside the active layer for different terminal voltages. Thus, the tool can be used to analyze the effects of the device geometry (e.g. thickness of various layers) and the transport parameters (e.g. exciton diffusion length, mobilities, etc.) on the performance of organic solar cells. The tool can also be used for the optimum device design for a given set of transport parameters.

nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.