Steady enhancement of organic solar cell performance by doping phosphorescent iridium complex

Jiang Huang; Junsheng Yu; Hong Wang

doi:10.1117/12.866377

22 October 2010 Steady enhancement of organic solar cell performance by doping phosphorescent iridium complex

Jiang Huang, Junsheng Yu, Hong Wang

Proceedings Volume 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology; 76580J (2010) https://doi.org/10.1117/12.866377
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Efficient organic photovoltaic cells based on a phosphor of (t-bt)₂Ir(acac) were demonstrated. Also, the photovoltaic performances of organic solar cells with a device structure of ITO/(t-bt)₂Ir(acac):CuPc (doping rate R=0 and 0.25)/C₆₀/BCP/Ag were determined based on the current density (J)-voltage (V) curves of a series of devices. The absorption spectra of doping layer (t-bt)₂Ir(acac):CuPc and C₆₀ films on quart substrates were measured to gain a direct insight of absorption ability of dopant (t-bt)₂Ir(acac). Then, revised optical transfer matrix theory was adopted to study inner effect of dopant (t-bt)₂Ir(acac) on the enhanced device performance, which shows that (t-bt)₂Ir(acac) dopant increases the light density of doping layer by reorganizing the light distribution inside organic films. However, the light absorption efficiency η_A of device with R=0.25 does not improve. According to the unchanging value of open circuit voltage V_OC and similar fill factor FF, the assumption that two devices with R=0 and 0.25 possess similar charge carrier collection efficiency ηCTηCC can be made. Thus, the inner enhancement of exciton diffusion efficiency η_ED is discovered with the assistance of longer triplet exciton diffusion length of (t-bt)₂Ir(acac).

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Jiang Huang, Junsheng Yu, and Hong Wang "Steady enhancement of organic solar cell performance by doping phosphorescent iridium complex", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76580J (22 October 2010); https://doi.org/10.1117/12.866377

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KEYWORDS

Excitons

Absorption

Diffusion

Doping

Organic photovoltaics

Solar cells

Iridium

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