AMPS-1D Modelling of Photo-Degradation Mechanism in P3HT: PCBM Bulk-Heterojunction Solar Cells
Bushra Mohamed Omer a
a Department of Physics-College of Sciences-Taif University, Taif, 21944
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Poster, Bushra Mohamed Omer, 025
Publication date: 28th March 2016

Achievement of long-term stability is one of the most challenging issues that hinder organic solar cells from commercial applications. Understanding the degradation mechanism in organic solar cells is of great importance, so that the stability and lifetime could be improved. In this study, the photo-degradation mechanism of P3HT:PCBM bulk-heterojunction solar cells is investigated by using the AMPS-1D (Analysis of Microelectronic and photonic Structures) computer program. An effective medium model with exponential tail states, Gaussian mid-gap states and P-doped active layer is used to simulate the J-V characteristics of the photovoltaic devices. By using the proposed model the experimental J-V characteristics of both fresh and degraded devices could be nicely reproduced. For both fresh and degraded devices, the energy level diagrams at thermodynamic equilibrium and open circuit conditions, the electric field, the charges lifetime, the total recombination rate is calculated as a function of position in the active layer. The simulation results show that prolonged light illumination causes an increase in the density of the mid-gap states, an increase of the p-doping concentration, a slight increase in back contact barrier height, which finally result in lower charge carriers mobility, higher total recombination rate and insufficient charge collection.



© FUNDACIO DE LA COMUNITAT VALENCIANA SCITO
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info