Presentation Information
[C-6-06]Characteristics of p-CuO/n-Si Solar Cells Fabricated by a Drop-Casting Method Using Copper(II) Acetate Solution
〇Yaoita Rin1, Suzuki Yuta1, Hiroyasu Ishikawa1 (1. Shibaura Institute of Technology)
Keywords:
p-CuO/n-Si Solar Cells,Drop-Casting Method,Copper(II) Acetate Solution (Molar Concentration)
This study fabricated p-CuO/n-Si heterojunction solar cells by forming a single-phase CuO thin film on an n-Si substrate using a low-cost, vacuum-free drop-casting method. To optimize power generation performance, the effect of copper(II) acetate solution concentration (0.228, 0.455, and 0.910 mmol/L) on photovoltaic properties was investigated. A solution of copper(II) acetate hydrate dissolved in ethanol and DMSO was dropped onto an n-Si(100) substrate, repeatedly calcined at 200°C, and then annealed in an O2 atmosphere at 350°C for 10 minutes. I-V measurements of the fabricated samples were conducted under a 40W incandescent bulb. The results showed that the open-circuit voltage peaked at 0.27 V for 0.455 mmol/L, while the short-circuit current reached a maximum of 30.25 µA at 0.228 mmol/L. Reflecting these variations, the maximum output power peaked at 1.23 µW at 0.455 mmol/L. Higher concentration solutions likely cause an increase in solute per drop, leading to uneven film formation and the retention of the high-boiling-point solvent, DMSO. Conversely, lower concentration solutions contain less solute per layer, which may hinder the formation of a dense film. These issues are believed to increase residues and structural defects within the film, ultimately resulting in a decrease in both open-circuit voltage and short-circuit current.