M. Stephen, S. Karuthedath, T. Sauermann, K. Genevičius, G. Juška
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Degradation effects on charge carrier transport in P3HT:PCBM solar cells studied by Photo-CELIV and ToF
Oxygen induced degradation is one of the major problems in the field of organic photovoltaics. Photo-degradation impacts on performance of inverted bulk hetero junction poly(3-hexylthiophene) : phenyl-C61-butyric acid methyl ester (P3HT:PCBM) solar cells has been investigated by means of charge extraction by linearly increasing voltage (CELIV) and time of flight (ToF) methods. The irreversible loss in short circuit current (Jsc) can be attributed to a combination of adverse effects such as loss in mobility of the charge carrires, increase in trapping effect and sheilding of electric field by equilibrium carriers upon degradation.
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