Variation of MEH-PPV layers with/without PEDOT:PSS layer in organic solar cells

Abstract

Organic solar cell in structures of Glass/FTO/TiO2/MEH-PPV and Glass/FTO/TiO2/PEDOT:PSS/MEH-PPV were fabricated using spin coating method. The MEH-PPV layer was variated at 1 layer, 2 layer, 3 layer and 4 layer. All samples without/with PEDOT:PSS for each MEH-PPV layer were characterized using the UV-Vis spectroscopy to evaluate the absorbance, the cross-section SEM to determine the thickness of MEH-PPV layer and the I-V meter to calculate the performance of organic solar cell. The thickness for each MEH-PPV layer was 0.88 μm (1 layer), 1.14 μm (2 layer), 2.35 μm (3 layer) and 5.81 μm (4 layer). The absorbance of samples without/with PEDOT:PSS increase with increasing the thickness of MEH-PPV. Adding PEDOT:PSS can improve the performance of samples. It is considered that PEDOT:PSS can enhance hole collection, exciton diffusion and photocarrier transport.