Abstract
Indium-doped zinc oxide (IZO) thin films were prepared by low-cost ultrasonic spray pyrolysis (USP). Both a low resistivity (3.13×10−3 Ω cm) and an average direct transmittance (400∼1500 nm) about 80% of the IZO films were achieved. The IZO films were investigated as anodes in bulk-heterojunction organic photovoltaic (OPV) devices based on poly(3-hexylthiophene) and [6,6]-phenyl C61-butyric acid methyl ester. The device fabricated on IZO film-coated glass substrate showed an open circuit voltage of 0.56 V, a short circuit current of 8.49 mA cm-2, a fill factor of 0.40, and a power conversion efficiency of 1.91%, demonstrating that the IZO films prepared by USP technique are promising low In content and transparent electrode candidates of low-cost OPV devices.
Highlights
Organic photovoltaics (OPVs) have attracted considerable attentions for use as the generation of renewable energy sources, due to their simple cell structure, ease of fabrication, low cost, and flexibility [1,2,3]
We demonstrated that ultrasonic spray pyrolysis (USP)-grown Indium-doped zinc oxide (IZO) electrodes are promising low-cost anode materials
Due to the relatively low resistivity and high transmittance extended to near infrared region (NIR), which is a critical benefit for the fabrication of lowcost OPVs
Summary
Organic photovoltaics (OPVs) have attracted considerable attentions for use as the generation of renewable energy sources, due to their simple cell structure, ease of fabrication, low cost, and flexibility [1,2,3]. To fabricate costefficient and large area OPVs, it is imperative to develop low-cost transparent conducting oxide (TCO) electrodes, which can substitute for the conventional indium tin oxide (ITO) electrodes and a highly efficient TCO deposition process. Considering the cost advantage of OPVs, ITO film is not a desirable anode material, due to the high cost and shortage of indium [4]. Wienke et al have used USP to fabricate IZO thin film, which were used in amorphous silicon solar cells as transparent anodes. There have been few studies on investigation of the fabrication of OPVs on the UPS-deposited IZO electrodes, which would be beneficial for the low-cost production of OPVs [17]. The performance of OPV device fabricated on both commercial ITO and USP-deposited IZO are compared
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