Abstract
We fabricated polymer solar cells with two different bulk heterojunction (BHJ), thieno(3,4-b)-thiophene/benzodithiophene copolymer:(6,6) phenylC71butyric acid methyl ester (PTB7:PC71BM), and poly (3-hexyl- thiophene):[6,6]-phenylC71 butyric acid methyl ester (P3HT:PC71BM). For the two polymer solar cell (PSC) devices, the titanium suboxide (TiOx) layer was inserted between the (BHJ) and metal electrode. The performance enhancement of the devices with / without TiOx layer was reported. X-ray diffraction (XRD) and UV-Vis measurements were used to investigate the structural and optical properties of samples. The current density–voltage (J-V) curves of the polymer solar cells were measured. We found that the TiOx layer improved the efficiency and stability of the devices compared with the same devices without TiOx layer. Also we observed that the PTB7/PC71BM/TiOx device was much stable compared with P3HT/PC71BM/TiOx device.
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