Effects of fluorination and thermal annealing on charge recombination processes in polymer bulk-heterojunction solar cells.

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ID: 54556
2018
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Abstract
We investigate the effect of fluorination on the photovoltaic properties of an alternating conjugated polymer composed of 4,8-di-2-thienylbenzo[1,2-:4,5-']dithiophene (BDT) and 4,7-bis([2,2'-bithiophen]-5-yl)-benzo-2-1-3-thiadiazole (4TBT) units in bulk-heterojunction solar cells. The unsubstituted and fluorinated polymers afford very similar open-circuit voltages and fill factor values, but the fluorinated polymer performed better due to enhanced aggregation which provides a higher photocurrent. The photovoltaic performance of both materials improved upon thermal annealing at 150-200 °C as a result of a significantly increased fill factor and open-circuit voltage, counteracted by a slight loss in photocurrent. Detailed studies of the morphology, light intensity dependence, external quantum efficiency and electroluminescence allowed the exploration of the effects of fluorination and thermal annealing on the charge recombination and the nature of the donor-acceptor interfacial charge transfer states in these films.
Reference Key
msmontoya2018effectsjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Más-Montoya, Miriam;Li, Junyu;Wienk, Martijn M;Meskers, Stefan C J;Janssen, René A J;
Journal journal of materials chemistry a
Year 2018
DOI
10.1039/c8ta03031f
URL
Keywords
remediation water scarcity technological innovation aquifer thermal energy storage geothermal energy heating and cooling photovoltaic-thermal module pilot plant

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