OPTICAL AND ELECTRICAL CHARACTERISATION OF P3HT:PCBM ORGANIC PHOTOVOLTAIC DEVICES
Abstract:
Organic photovoltaic (OPV) devices have emerged as a promising alternative to traditional inorganic solar cells due to their cost-effective fabrication, lightweight nature, and compatibility with flexible substrates. In this study, we focus on the optical and electrical characterization of P3HT:PCBM organic photovoltaic devices, which are composed of a blend of poly(3-hexylthiophene) (P3HT) and [6,6] -phenyl-C61-butyric acid methyl ester (PCBM) as the active layer.
The optical properties of the P3HT:PCBM films were investigated using UV-Vis spectroscopy. The absorption spectra revealed strong absorption in the visible region, indicating efficient light harvesting by the active layer. Additionally, the absorption onset was used to estimate the bandgap of the organic material, providing insights into the energy levels involved in the photovoltaic process.
To evaluate the electrical characteristics of the devices, current-voltage (I-V) measurements were performed under simulated solar illumination. The I-V curves exhibited diode-like behavior, with the devices operating in the photovoltaic mode. Parameters such as short-circuit current (Jsc), open-circuit voltage (Voc), fill factor (FF), and power conversion efficiency (PCE) were extracted from the I-V curves to assess the device performance.
Furthermore, impedance spectroscopy was employed to analyze the charge transport and recombination processes in the devices. By measuring the impedance spectra at different bias voltages and frequencies, the charge carrier mobility, charge recombination resistance, and capacitance were determined, providing valuable information about the device’s charge transport and recombination mechanisms.
Overall, the optical and electrical characterization of P3HT:PCBM organic photovoltaic devices provides insights into the fundamental processes governing their performance. This understanding is crucial for the optimization and design of efficient organic solar cells, paving the way for their integration into various applications, including portable electronics, wearable devices, and building-integrated photovoltaics.
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