Understanding the effect of triplet sensitizers in organic photovoltaic devices |
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| Affiliation: | 1. University of Rochester, Department of Chemistry, Rochester, NY 14627, USA;2. University of Rochester, Department of Chemical Engineering, Rochester, NY 14627, USA;1. Instituto de Ciencia Molecular (ICMOL), Universidad de Valencia, Calle Catedrático José Beltrán, 2, 46980 Paterna, Spain;2. Skolkovo Institute of Science and Technology, 143025 Skolkovo, Moscow Region, Russia;3. Canatu Oy, Konalankuja 5, FI-00390, Helsinki Finland;4. Department of Applied Physics, Aalto University, School of Science, P.O. Box 15100, FI-00076 Aalto, Finland;5. St. Petersburg Polytechnic University, 195251, St. Petersburg, Russia;1. College of Chemistry, Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;2. Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;1. Department of New Material Chemistry, Korea University, Sejong, 339-700, Republic of Korea;2. Department of Chemistry, Korea National University of Education, Chungbuk, 363-791, Republic of Korea;3. Department of Electronics and Communication, LNMIIT, Jaipur, India;4. Department of Physics, LNMIIT, Jaipur, India;5. JEC Group of Colleges, Jaipur Engineering College, Kukas, Jaipur, India |
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| Abstract: | The effect of PtOEP as a dopant on the performance of MEH-PPV/C60 photovoltaic devices was studied. Bilayer heterojunction devices with various compositions and layer structures were used to determine the possible pathways by which the photogeneration efficiency is enhanced. A key finding is that photocurrent generation enhancement always occurs in the MEH-PPV absorption region, regardless of the PtOEP dopant concentration or the MEH-PPV layer thickness. This result suggests that the presence of PtOEP in the donor MEH-PPV layer is primarily responsible for increasing the triplet exciton diffusion length of MEH-PPV by acting as a triplet sensitizer, rather than as an additional absorber for direct photogeneration. Values obtained from simulation show that the enhancement of exciton diffusion length of MEH-PPV can be more than a factor of 2 with optimal PtOEP concentrations. Further support for the role of PtOEP as a triplet sensitizer in MEH-PPV was obtained in experiments incorporating a blocking layer between MEH-PPV and C60, whereby the various exciton transfer processes can be differentiated. |
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| Keywords: | MEH-PPV PtOEP Exciton diffusion length Dopant Organic photovoltaic devices |
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