Dr. Ian J. Curtin Profile

Dr. Ian J. Curtin

at Univ of Minnesota Twin Cities

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Proceedings Article | 10 October 2019 Paper

Measurements of dark triplet exciton diffusion in a phosphor-sensitized organic photovoltaic cell

Kaicheng Shi, Ian Curtin, Andrew Healy, Tao Zhang, David Blank, Russell Holmes

Proceedings Volume 11094, 110941Q (2019) https://doi.org/10.1117/12.2528883

KEYWORDS: Excitons, Diffusion, Internal quantum efficiency, External quantum efficiency, Absorption, Organic photovoltaics, Optical pumping, Heterojunctions, Doping

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Organic photovoltaic cell performance is limited in part by a short exciton diffusion length (L_D). While state-of-the-art devices address this challenge using a morphology-optimized bulk heterojunction (BHJ), longer L_D would relax domainsize constraints and enable higher efficiency in simple bilayer architectures. One approach to increase L_D is to exploit long-lived triplet excitons in fluorescent materials. Though these states do not absorb light, they can be populated using a host-guest triplet-sensitized architecture. Photogenerated host singlets undergo energy transfer to a guest, which rapidly forms triplets that are transferred back to the long-lived host triplet state. Previous efforts have been focused on Pt- and Irbased guests. Here, a host-guest pairing of metal-free phthalocyanine (H₂Pc) and copper phthalocyanine (CuPc) is explored, advantageous as the guest also has strong and complementary optical absorption. In optimized devices (20 vol.% CuPc), the short-circuit current is enhanced by 20%. To probe the origin of the enhancement, the exciton L_D is measured using a device-based methodology that relies on fitting ratios of donor-to-acceptor internal quantum efficiency as a function of layer thickness. Compared with the neat H₂Pc, the L_D of the 20 vol.% CuPc doped layer increases from (8.5 ± 0.4) nm to (13.4 ± 1.6 nm), confirming the increased device current comes from enhanced exciton harvesting.

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