Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 45, Issue 8-11, Pages L217-L219Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.45.L217
Keywords
organic thin-film solar cell; organic semiconductor; photovoltaic; fill factor; ZnPc; C-60
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To fabricate a high-performance of organic photovoltaic (PV) cells, not only short-circuit photocurrent density (I-sc), but also fill factor (FF) should be improved. Here, we improved FF by controlling the measurement environment. Because of the prevention of electron trapping by oxygen in the organic semiconducting layer, FF in vacuum environment increased 40% compared with that in air Under 80 mW/cm(2) irradiation of air mass 1.5 global solar conditions at room temperature. Finally, we obtained a power conversion efficiency of 3.6% by controlling the measurement environment and the optimization of the organic PV cell Structure, where FF was markedly improved up to 0.61.
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