Abstract
The analysis of microelectronic and photonic structures-one dimension (AMPS-1D) was used to study and simulate the performance of organic heterojunction solar cells based on D1 –B-Edot-B-D2-A as electron donors, and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as an electron acceptor. The organic photovoltaic cell devices using T3-B-Edot-B-T3-A/PCBM showed the improved open-circuit voltage Voc, short-circuit current density Jsc, fill factor FF, and power conversion efficiency PCE values for the optimum thickness of 120 nm and the effective state density of electrons and holes of 1021cm−3.The P3-B-Edot-B-T3-A/PCBM and P3-B-Edot-B-P3-A/PCBM based devices exhibited a power conversion efficiency (PCE) of 9.295% and 8.735%, respectively, which outperformed the corresponding T3-B-Edot-B-T3-A/PCBM, Cbz-B-Edot-B-T3-A/PCBM, F-B-Edot-B-T3-A/PCBM, and A-B-Edot-B-T3-A/PCBM based devices (7.330, 6.622, 7.226, and 7.327%). More importantly, the P3-B-Edot-B-T3-A/PCBM and P3-B-Edot-B-P3-A/PCBM -based device delivered the highest PCE of 14.432% and 15.031% respectively, when we deposit a layer of PEDOT between the indium tin oxide (ITO) and the active layer, which is a clear improvement over other results in the literature.
Highlights
The reference scenario of the international energy agency (IEA) forecasts that global primary energy needs will increase by 55% between 2005 and 2030, due in particular to exponential growth in emerging countries [1]
In this part of the work, we will focus our efforts on the characterization of an indium tin oxide (ITO)/T3-B-EDOT-B-T3-A / PCBM/Al type organic photovoltaic cell as it is shown in Figure 4. [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is a derivative of Buckminster's C60 fullerene, it has been widely used in combination with P3HT and other donors in organic solar cells due to its high electron mobilit y properties [35,36] and its ability to organize into a structure favorable for good electronic conductivity [37]
For a fixed temperature (300 K), we will study the impact of the active layer thickness on the properties of the organic solar cell based on T3-B-EDOT-B-T3-A/ PCBM (Figure 5)
Summary
The reference scenario of the international energy agency (IEA) forecasts that global primary energy needs will increase by 55% between 2005 and 2030, due in particular to exponential growth in emerging countries [1]. The value of the power conversion efficiency (PCE) for organic solar cells remains lower if compared to the efficiency obtained by other technologies (Silicium 25% [4]), several reasons justify the efforts made to develop the organic sector, and which lie in the advantages of organic materials This technology would allow access to flexible photovoltaic modules and/or large surfaces. Electronic conduction in the case of organic materials requires the possibility of creation or injection of free charge carriers This implies easy ionization; either by ejection of electrons form HOMOS in the molecule (Highest Occupied Molecular Orbitals), or by electron capture in LUMOs (Lowest Unoccupied Molecular Orbitals). The second objective is to study the influence of the addition of a PEDOT layer between the anode (ITO) and the active layer on the performance of the photovoltaic solar cell
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