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Enhanced exciton diffusion in an organic photovoltaic cell by energy transfer using a phosphorescent sensitizer
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21.NPD: Stock number:LT-E101, Rubipy Scientific Inc., Ottawa, ON, Canada. : Kintec, Kowloon, Hong Kong. : Stock number:MR6LP, MER Corporation, Tucson, AZ 85706, USA. BCP: Stock number:L01378, Alfa Aesar, Ward Hill, MA 01835, USA.
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We demonstrate enhanced excitondiffusion in an organic photovoltaic cell through the incorporation of a phosphorescent sensitizer. The increase in excitondiffusion length is realized using a composite electron donor layer consisting of a -bis(naphthalen-1-yl)--bis(phenyl)-benzidine (NPD) host doped with the phosphorescent guest -tris(2-phenylpyridine) iridium . The presence of the phosphor at low concentration allows for the population of the long-lived NPD triplet state and an increase in . An increase in the NPD from to is extracted from measurements of the external quantum efficiency for donor layers containing . This enhancement leads to a improvement in the power conversion efficiency relative to devices containing an undoped donor layer.
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