Journal
APPLIED PHYSICS EXPRESS
Volume 5, Issue 7, Pages -Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/APEX.5.071601
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The authors investigate the effects of compressive stress on the performance of organic solar cells based on poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) blends. The short-circuit current density is improved, and a maximum 16% enhancement in power conversion efficiency is achieved by introducing suitable a stress into the device. The improved performance is attributed to the formation of a good contact between the Al cathode and the P3HT: PCBM blend owing to the introduction of a suitable compressive stress. Meanwhile, the barrier height at Al/blend is lowered from 0.34 to 0.23 eV by evaluating the temperature dependence of the current-voltage characteristics. (c) 2012 The Japan Society of Applied Physics
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