Abstract
In this article, silver nanowires (AgNWs) were prepared and introduced into the double-layer photoanode of dye-sensitized solar cells (DSSCs). Silver nanowires with a diameter of about 50–60 nm and a length of 1–2 mm were prepared by the polyol method. The power conversion efficiency of the double-layer photoanode DSSC made of AgNWs@TiO2 and AgNPs@TiO2 composite materials is 6.38%. Compared with the unmodified DSSC, the composite double-layer photoanode combined with AgNWs and AgNPs increased the efficiency of DSSC by 58.7%. This increased efficiency was mainly due to the localized surface plasmon resonance effect caused by AgNPs and AgNWs. The increased light collection was caused by the plasma effect of AgNPs, and it increased the short-circuit photocurrent density (JSC). The conductive properties of AgNWs improved interface charge transfer and delay charge recombination. The effect of a low light environment on DSSC efficiency was also investigated, and the best photovoltaic conversion efficiency under an irradiance of 10 mW/cm2 was found to be 8.78%.
Highlights
The conventional dye-sensitized solar cell (DSSC) photoanode film is usually composed of a porous mesoporous layer of TiO2 nanoparticles [1,2]
The localized surface plasmon resonance (LSPR) effect caused by gold or silver precious metal nanoparticles has been reported to enhance the light trapping in DSSC applications [3,10,11]
In order to improve this problem, we studied the preparation of a double-layer photoanode film, and different layers were modified by silver nanoparticles (AgNPs) and silver nanowires (AgNWs) [11], respectively
Summary
The conventional dye-sensitized solar cell (DSSC) photoanode film is usually composed of a porous mesoporous layer of TiO2 nanoparticles [1,2]. In order to develop low-cost [3], stable, and high-performance solar cells, various components of a DSSC have been extensively studied. Research on these key components included developing better photoanodes [4,5,6], synthesizing efficient sensitizers, and developing new electrolytes [7,8,9]. The AgNPs@TiO2 layer causes the LSPR effect, thereby enhancing the interface charge transfer to improve the light trapping of the photoanode [12,13]. The AgNWs@TiO2 charge conduction layer has a high-speed conduction channel to delay the charge recombination process, and this improves the electrical conductivity of the photoanode
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