Motaung, DEMalgas, GFArendse, CJ2012-01-092012-01-092011-03Motaung, DE, Malgas, GF and Arendse, CJ. 2011. Insights into the stability and thermal degradation of P3HT:C60 blended films for solar cell applications. Journal of Materials Science, Vol 46(14), pp 4942-49520022-2461http://www.springerlink.com/content/f3534765285611g2/http://hdl.handle.net/10204/5456Copyright: 2011 Springer. This is an ABSTRACT ONLYThis paper demonstrates the changes in the nanoscale morphology of the blended films induced by a diffusion of C60 molecules and degradation during longer thermal treatment above the glass transition temperature (130 °C). The results showed that the film morphology, including the size and population of poly(3-hexylthiophene) (P3HT) crystallites, rapidly reduced with annealing time. A large-scale (>1µm) C60 aggregation, demonstrating a bulky phase separation between the polymer and C60, was identified after 5 h annealing, which resulted in a degradation of charge carrier mobility and conductivity. X-ray diffraction verifies that the interchain packing of P3HT within the crystallized phase improved with an increasing in annealing time, but the volume fraction of the P3HT (100) phase normal to substrate increased up to 3 h and decreased at longer annealing times resulting in the ageing of the films. Changes in the infrared spectra of the extended annealed samples were recorded and the oxidation products were identified. A degradation mechanism that accounted for the modifications in the infrared spectra and a detachment of the hexyl chain from P3HT was demonstrated, resulting in chain cutting, conjugation loss and a reduction in the UV–vis absorbance. The morphology change with the annealing time resulted in an abrupt decrease in the PCE of P3HT:C60 solar cells. These findings signify that the stability of P3HT:C60 solar cells cannot be secured for longer annealing period owing to the unsettled morphology.enNanoscale morphologyC60 moleculesSolar cell applicationsP3HT thermal degradationThermal degradationSolar cellMaterials sciencesArticleMotaung, D., Malgas, G., & Arendse, C. (2011). Insights into the stability and thermal degradation of P3HT:C60 blended films for solar cell applications. http://hdl.handle.net/10204/5456Motaung, DE, GF Malgas, and CJ Arendse "Insights into the stability and thermal degradation of P3HT:C60 blended films for solar cell applications." (2011) http://hdl.handle.net/10204/5456Motaung D, Malgas G, Arendse C. Insights into the stability and thermal degradation of P3HT:C60 blended films for solar cell applications. 2011; http://hdl.handle.net/10204/5456.TY - Article AU - Motaung, DE AU - Malgas, GF AU - Arendse, CJ AB - This paper demonstrates the changes in the nanoscale morphology of the blended films induced by a diffusion of C60 molecules and degradation during longer thermal treatment above the glass transition temperature (130 °C). The results showed that the film morphology, including the size and population of poly(3-hexylthiophene) (P3HT) crystallites, rapidly reduced with annealing time. A large-scale (>1µm) C60 aggregation, demonstrating a bulky phase separation between the polymer and C60, was identified after 5 h annealing, which resulted in a degradation of charge carrier mobility and conductivity. X-ray diffraction verifies that the interchain packing of P3HT within the crystallized phase improved with an increasing in annealing time, but the volume fraction of the P3HT (100) phase normal to substrate increased up to 3 h and decreased at longer annealing times resulting in the ageing of the films. Changes in the infrared spectra of the extended annealed samples were recorded and the oxidation products were identified. A degradation mechanism that accounted for the modifications in the infrared spectra and a detachment of the hexyl chain from P3HT was demonstrated, resulting in chain cutting, conjugation loss and a reduction in the UV–vis absorbance. The morphology change with the annealing time resulted in an abrupt decrease in the PCE of P3HT:C60 solar cells. These findings signify that the stability of P3HT:C60 solar cells cannot be secured for longer annealing period owing to the unsettled morphology. DA - 2011-03 DB - ResearchSpace DP - CSIR KW - Nanoscale morphology KW - C60 molecules KW - Solar cell applications KW - P3HT thermal degradation KW - Thermal degradation KW - Solar cell KW - Materials sciences LK - https://researchspace.csir.co.za PY - 2011 SM - 0022-2461 T1 - Insights into the stability and thermal degradation of P3HT:C60 blended films for solar cell applications TI - Insights into the stability and thermal degradation of P3HT:C60 blended films for solar cell applications UR - http://hdl.handle.net/10204/5456 ER -