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22 October 2010 Steady enhancement of organic solar cell performance by doping phosphorescent iridium complex
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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 ηA of device with R=0.25 does not improve. According to the unchanging value of open circuit voltage VOC 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 ηED 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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