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FDTD simulation studies on improvement of light absorption in organic solar cells by dielectric nanoparticles
摘要： In this paper, we present a systematic design and analysis of organic solar cell (OSC) by embedding dielectric nanoparticles layer at anode. Using numerical simulations, we show that there is improvement in the light absorption in the active layer of the device using nanoparticles. The nanoparticles will act as scattering medium for the incident light and hence trap the light inside the device. For the light scattered at different angles, the optical path length in the active medium is increased and this leads to more absorption of light in the active layer and thereby increase in the efficiency. The scattering efficiency and hence the absorption of solar radiation for generation of current depends on the particle size, inter-particle separation and the refractive index contrast between the particles and the embedding medium. Mie theory has been used to calculate the scattering efficiency of nanoparticles. The effect on light absorption and current density of OSC due to nanoparticles has been carried out using finite difference time domain analysis. It is shown that the proposed OSC structure increases the light absorption in the active layer of the device by 40% and short circuit current density by 34%.
关键词： Organic solar cell,Dielectric nanoparticles,Light absorption,Scattering efficiency,Optical simulation
更新于2025-09-23 15:19:57
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Scattering in graphene quantum dots under generalized uncertainty principle
摘要： In this article, the Dirac electron scattering problem on circular barrier of radius R is studied under the generalized uncertainty principle (GUP). The expressions of scattering coefficients, scattering cross-section and scattering efficiency of massless Dirac particle are obtained by solving the massless Dirac equation under GUP and discussed by numerical methods. It shows that the scattering coefficient, the scattering cross-section, and the scattering efficiency depend explicitly on the GUP parameter α. For the scattering coefficient Rl, GUP may cause slight shift in the oscillation position of |Rl|2 and make some peaks value of |Rl|2 smaller. For scattering cross-section and scattering efficiency, GUP may also lead to slight shift in their oscillation position and increase of amplitude when the GUP parameter increases.
关键词： generalized uncertainty principle (GUP),scattering cross-section,Graphene,scattering efficiency,scattering coefficients
更新于2025-09-12 10:27:22