Abstract
In this paper, we present our work on high-efficiency multi-junction polymer and hybrid solar cells. The transfer matrix method is used for optical modeling of an organic solar cell, which was inspired by the McGehee Group in Stanford University. The software simulation calculates the optimal thicknesses of the active layers to provide the best short circuit current (JSC) value. First, we show three designs of multi-junction polymer solar cells, which can absorb sunlight beyond the 1000 nm wavelengths. Then we present a novel high-efficiency hybrid (organic and inorganic) solar cell, which can absorb the sunlight with a wavelength beyond 2500 nm. Approximately 12% efficiency was obtained for the multi-junction polymer solar cell and 20% efficiency was obtained from every two-, three- and four-junction hybrid solar cell under 1 sun AM1.5 illumination.
Highlights
In the past few years, polymer solar cells (PSCs) have been attracting much attention due to their ease of processing, low cost, flexibility and lightweight nature compared to the traditional inorganic solar cells
The study by Islam [9] showed that the one-junction polymer solar cell with a P3HT:PCBM active layer can cover the 800 nm light spectrum with 2.9% efficiency
Theoretical settings have been shown to improve the efficiency of the organic solar cells, which
Summary
In the past few years, polymer solar cells (PSCs) have been attracting much attention due to their ease of processing, low cost, flexibility and lightweight nature compared to the traditional inorganic solar cells. There have been various methods implemented, such as annealing, device structure tuning and active material modification, to improve the efficiency of the PSC [5]. Among the various methods involving two or more organic junctions, the tandem structure is one of the most effective solutions. The photovoltaic devices using a mixture of inorganic nanoparticles and conjugated polymers, called hybrid solar cells, have gained popularity due to their ability to absorb near-infrared light. To optimize the device performance, it is essential to adjust the thickness of active layers used in tandem photovoltaic cells. The study by Islam [9] showed that the one-junction polymer solar cell with a P3HT:PCBM active layer can cover the 800 nm light spectrum with 2.9% efficiency. The study by Swapna et al [10] showed that the one-junction polymer solar cell with MEHPPV:PCBM active
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