Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 44, Issue 3, Pages 1296-1300Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.1296
Keywords
polymer; fullerene C-60; organic solar cells; blended structure; bilayered structure
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We have fabricated both blended and bilayered organic photovoltaic cells (OPVCs) using C-60 and poly [2-methoxy-5-(2'-ethyihexoxy)-1,4-phenylenevinylene] (MEH-PPV). Improvements in photovoltaic performance are seen in blended OPVCs when the C-60 concentration is increased. It is believed that the optimized surface morphology of MEH-PPV/C-60 Composite and improved donor-acceptor proximity, leading to electron conductivity, contribute to the increase in power conversion efficiency E-ff. Two broad peaks were observed in the spectral response of the blended OPVCs, with maximum peaks at similar to 490 nm (= I-BL1) and similar to 350 nm (= I-BL2). The intensity ratio of I-BL1 to I-BL2 (I-BL1/I-BL2) decreases with an increase in the C-60 concentration. Also, I-BL1 is blue-shifted by 25-30 nm with an increase in the C-60 concentration. The significant improvement in the performance was observed in the bilayered OPVCs on the thermally induced interdiffusion Of C-60 into the MEH-PPV network, leading to the existence of C-60 molecules within the exciton diffusion radius of the MEH-PPV, network. The spectral response of bilayered OPVCs reveals two peaks at 535 nm and 345 nm. The former peak is red-shifted by 45 nm compared to that in blended OPVCs. We also investigate the effect of top electrode materials on the photovoltaic performances. To the best of our knowledge, we have obtained the best performances of blended and bilayered OPVCs fabricated with the Al and Mg electrodes, respectively. In both OPVC structures, the nanoscale composition control of the two materials, the choice of metal electrode, and the device processing techniques all play an important role in determining or enhancing the solar cell performance.
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