Study on the Crystal Size of PCBM in Organic Photovoltaic Cells

Nan Hai Sun; Xiao Ying Chang

doi:10.4028/www.scientific.net/AMR.535-537.1258

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Recent Progress in Developing Magnetic Properties of Mn-Doped ZnO Diluted Magnetic Semiconductors
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The Two-Photon Excited Fluorescence of Pyrazine Derivatives
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The Optical and Structural Properties of In_xGa_1-XN/GaN Multiple Quantum Wells by Metal Organic Chemical Vapor Deposition
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 535-537Study on the Crystal Size of PCBM in Organic...

Study on the Crystal Size of PCBM in Organic Photovoltaic Cells

Abstract:

Phase separation of the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester(PCBM) active layer (ATL) was investigated by varying their relative ratio in the organic solar cells (OSCs).With the help of the UV/visible spectrophotometer, optical microscopy and scanning electron microscope,we found that the cluster of PCBM at the interface or surface was affected by Al cathode, the composition of the blends and thermal annealing. The disc-like shape crystals of PCBM substituted for the needle-like ones at higher PCBM compositions at the ATL/Al interface, which led to stronger contacts and bigger contact area. It could make short circuit current density increase, but may affect the blend morphology and result in parallel resistance and open circuit voltage decreased with the PCBM ratio increasing from 40 to 60%. The microstructure of the P3HT:PCBM ATL, determined by the composition dependent phase separation, supported the optimized performance of the OSCs with the composition of 40–50% PCBM.