Enhancing the Efficiency of Polymer Solar Cells by Modifying Buffer Layer with N,N-Dimethylacetamide

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Abstract
We modified the PEDOT:PSS anode buffer layer in P3HT:PCBM bulk heterojunction polymer solar cells by spin-coating the solvent N,N-dimethylacetamide (DMAC). This modification significantly enhanced the efficiency of the ITO/PEDOT:PSS/DMAC/P3HT:PCBM/LiF/Al solar cells. The DMAC-treated device spin-coated at 3000 rpm exhibited a power conversion efficiency (PCE) of 3.74%, a 59% improvement over that of an untreated cell. To study the mechanism of improving the conversion efficiency, we characterized many parameters, including the light and darkI-Vcurves, external quantum efficiency, active layer absorption spectrum, transmission spectrum of ITO:PEDOTPSS, PEDOT:PSS surface morphology, and electrical conductivity. Modifying the PEDOT:PSS film increased conductivity, making it more conducive to hole extraction and collection. Our findings suggest that modifying the anode buffer layer can improve photoelectric conversion efficiency.
Funding Information
  • Natural Science Foundation of Hebei Province (F2012201089, A2011201008, 14964306D, ZH2011205, ZD20131089)
  • Natural Science Foundation of Hebei Province (F2012201089, A2011201008, 14964306D, ZH2011205, ZD20131089)
  • Key Basic Research Project of Hebei Province (F2012201089, A2011201008, 14964306D, ZH2011205, ZD20131089)
  • Education Department, Hebei Province (F2012201089, A2011201008, 14964306D, ZH2011205, ZD20131089)
  • Education Department, Hebei Province (F2012201089, A2011201008, 14964306D, ZH2011205, ZD20131089)

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