Suppression of bimolecular recombination by UV-sensitive electron transport layers in organic solar cells

Doo Hyun Ko, John R. Tumbleston, Myoung Ryul Ok, Honggu Chun, Rene Lopez, Edward Samulski

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Incorporating UV-sensitive electron transport layers (ETLs) into organic bulk heterojunction (BHJ) photovoltaic devices dramatically impacts short-circuit current (Jsc) and fill factor characteristics. Resistivity changes induced by UV illumination in the ETL of inverted BHJ devices suppress bimolecular recombination producing up to a two orders of magnitude change in Jsc. Electro-optical modeling and light intensity experiments effectively demonstrate that bimolecular recombination, in the form of diode current losses, controls the extracted photocurrent and is directly dependent on the ETL resistivity.

Original languageEnglish
Article number083101
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 2010 Oct 15
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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