Properties of Pulsed-Laser-Deposited CuI and Characteristics of Constructed Dye-Sensitized TiO2$|$Dye$|$CuI Solid-State Photovoltaic Solar Cells

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Transparent semiconducting copper iodide (CuI) films were deposited by pulsed laser deposition and their characteristics were investigated. In this paper, the structural and optoelectrical properties of CuI thin films and the construction of dye-sensitized TiO2$|$Dye$|$CuI solid-state photovoltaic solar cells are reported. The optical absorption of these films shows a remarkable blue shift compared to that of polycrystalline CuI, which can be explained by the formation of ultrafine CuI grains. The CuI films exhibited an optical transmittance of over 80% in wavelengths ranging from 400 to 900 nm and a minimum resistivity of approximately 2 K$\Omega$$\cdot$cm. The properties of pulsed-laser-deposited CuI in the power output of n-TiO2$|$Dye$|$p-CuI cells is studied. An efficient charge generation is observed through the illumination of the TiO2 layer of the fabricated n-TiO2$|$Dye$|$p-CuI cells. The cell performance has been characterized base on the current–voltage ($I$–$V$) working curve determined under AM 1.5 illumination conditions (100 mW/cm2, 25°C). The maximum short-circuit photocurrent density ($J_{\text{sc}}$) of approximately 12.2 mA/cm2 and open-circuit photovoltage ($V_{\text{oc}}$) of approximately 480 mV were obtained for the TiO2$|$Dye$|$CuI solid-state photovoltaic solar cells with good reproducibility. The fill factor (FF) and power conversion efficiency ($\eta$) were about 47.8% and 2.8%, respectively.
2003-08-15