Evaluation of the Performance of an Organic Thin Film Solar Cell Prepared Using the Active Layer of Poly[[9-(1-octylnonyl)-9H-carbazole-2.7-diyl]-2.5-thiophenediyl-2.1.3-benzothiadiazole-4.7-Diyl-2.5-thiophenediyl]/[6,6]-Phenyl C71 Butyric Acid Methyl Ester Composite Thin Film

Organic solar cell devices were fabricated using poly[9-(1-octylnonyl)-9H-carbazole-2.7-diyl]-2.5-thiophenediyl-2.1.3-benzothiadiazole-4.7-diyl-2.5-thiophenediyl] PCDTBT/ [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) activelayer deposited by spin coating. Moreover, the relationship between solar cell performance and buffer layer thicknesswas investigated by spin coating speed and AFM imaging of the buffer layer surface. The performance of the organicsolar cell with spin-coated active layer was then evaluated, and the power conversion efficiency of the solar cell wasdetermined to be > 5%.