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• W2092280152 abstract "A dynamic model for the intensity modulated photocurrent spectroscopy (IMPS) of bilayer polymer/TiO2 photovoltaic cells is developed in consideration of the exciton generation in the polymer layer, exciton diffusion to the polymer/TiO2 interface, electron injection into the TiO2 layer, and electron diffusion through the TiO2 layer; particularly, the phase shift ϕn(ω) due to the time delay between exciton generation and dissociation is included in the continuity equations for electron transport. Bilayer polymer/TiO2 cells consisting of poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) and nanostructured TiO2 were prepared for experimental purposes, with a TiO2 layer thickness d of 120 and 65 nm. Experimental data obtained confirm all the main expectations of the model, providing important information on incident photon-to-current conversion efficiency (IPCE), exciton dissociation, and electron transport. The frequency-dependent ϕn(ω) affects the location (Phigh) where IMPS response crosses with the positive real axis at high frequency, by imposing a ϕn(ω) effect on electron transport in the TiO2 layer to the collection electrode. A more remarkable ϕn(ω) effect results from either a larger electron diffusion coefficient De in TiO2 or a smaller d. An increased d value makes the Phigh point tend toward the origin and the electron transit time τD through TiO2 layer increase, but both S and IPCE values decrease, and the IPCE value depends greatly on the exciton dissociation rate S at the polymer/TiO2 interface. The measured IMPS responses of the cells are satisfactorily fitted to the model. Dynamic results show that both cells exhibit a ϕn(ω) effect with ω0 of 6 × 104 rad/s and a De of 2 × 10−5 cm2/s, but the different d values lead to varied τD, S, and IPCE values, which are, respectively, 1.90 ms, 141 cm2/s and 0.380% for d = 120 nm, but 0.48 ms, 153 cm2/s, and 0.410% for d = 65 nm. Our studies demonstrate that the exciton dissociation efficiency at the polymer/TiO2 interface is crucially important for highly efficient device performance." @default.
• W2092280152 created "2016-06-24" @default.
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• W2092280152 date "2009-01-06" @default.
• W2092280152 modified "2023-10-16" @default.
• W2092280152 title "Characterization of Polymer/TiO₂ Photovoltaic Cells by Intensity Modulated Photocurrent Spectroscopy" @default.
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• W2092280152 doi "https://doi.org/10.1021/jp8032512" @default.
• W2092280152 hasPublicationYear "2009" @default.
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