Driving vertical phase separation in a bulk-heterojunction by inserting a poly(3-hexylthiophene) layer for highly efficient organic solar cells

Jin Young Oh, Woo Soon Jang, Tae Il Lee, Jae Min Myoung, Hong Koo Baik

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A desirable vertical phase separation of a bulk-heterojunction was achieved by inserting a P3HT layer between the blend layer and the poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) layer. According to the high (PEDOT:PSS) and low (P3HT) surface energies of substrate, it might be possible to modulate the vertical phase separation in the bulk-heterojunction. The result of vertical phase separation was determined using time-of-flight secondary-ion mass spectroscopy analysis. A controlled thickness of 50 nm for the inserted P3HT layer prevented undesirable light absorption and the power conversion efficiency of this condition was increased by 44% compared to that of a reference device.

Original languageEnglish
Article number023303
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 2011 Jan 10


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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