Sci. Adv. Today 4 (2018) 25279  
  Research Article  
   
   
         
Precise control in photovoltaic response of Poly(3-hexylthiophene): Fullerene solar cells via accelerated-solvent vapor annealing  
  Soundaram J. Ananthakrishnana, Swapnil Sharea, Jacob Straina,b, Manda Venkataramanaa, Muhammad Jahanc and Hemali Rathnayakea,d  
     
a Department of Chemistry, Western Kentucky University, 1906 College Height Blvd, Bowling Green, KY 42101, USA
b Department of Chemistry, University of Louisville, Louisville, KY 40292, USA
c Department of Mechanical and Manufacturing Engineering, Miami University, Oxford, OH 45056, USA
d Department of Nanoscience, University of North Carolina at Greensboro, Greensboro, NC 27401, USA

   
  Abstract  
  The photovoltaic response in blend films of poly(3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) was optimized via a pre-solvent vapor annealing approach. The test devices with the configuration of ITO/PEDOT.PSS/P3HT:PC61BM/Ca-Al upon subjected to accelerated solvent vapor annealing in 1,2-dichlorobenzene for 7 minutes under controlled pressure gave an average PCE of 6.61% under ambient characterization conditions. As revealed by transmission electron microscopy (TEM) and atomic force microscopy (AFM), the solvent vapor annealed thin films shows well-organized nano-phase segregation of P3HT and PC61BM resulting percolated pathways thus enhanced the device efficiency. The distinguishable absorption shoulder peak at 700 nm in thin film absorption spectra of optimized blend films further suggests that the formation of freely mobile delocalized polarons in crystalline P3HT domains due to the influence of interfacial doping from PEDOT:PSS during the device fabrication process.  
     
   
  Cite this article as:  
  Soundaram J. Ananthakrishnan, Swapnil Share, Jacob Strain, Manda Venkataramana, Muhammad Jahan and Hemali Rathnayake, Precise control in photovoltaic response of Poly(3-hexylthiophene): Fullerene solar cells via accelerated-solvent vapor annealing, Sci. Adv. Today 4 (2018) 25279.