The Optical And Electrical Properties Of Inorganic/Organic Hybrid Solar Cells Due To Localized Surface Plasmon Resonance

At present,inorganic/organic hybrid cells based on silicon have attracted great attention in a variety of solar cells,because this kind of batteries is a combination of the advantages of inorganic and organic materials.In order to utilize the solar energy as far as possible,it is very necessary to improve the conversion efficiency of solar cells.The most direct and effective way to improve the efficiency of batteries is to enhance the light absorption.In this letter,the metal nanoparticles were introduced into the hybrid solar cells,which benefited to increased light harvesting efficiency,so as to improve the conversion efficiency of the batteries finally.The results of this thesis are as follows:1?Firstly,the optimal size of the AgNPs was chosen by using Lumerical FDTD Solutions,which is based on the finite-difference time-domain method.Then we successfully demonstrated a modified EE method to fabricate AgNPs/SiNHs nanocomposite films.The absorption spectra of the films with different etching time and the films without AgNPs were investigated.It could be clearly seen that the absorption peak of the samples.Besides,compared with the films without AgNPs,the optical absorption of the films with AgNPs was remarkably increased throughout the wavelength range of 400nm-700nm.An enhancement of 3.2 times in total integrated absorption was obtained(the integrated wavelength range is 400nm-700nm)for the films with AgNPs with 30 min etching,in comparison with AgNPs-free films.The enhancement of the light absorption at the short wavelength could be attributed to localized surface plasmon resonance(LSPR)effect and increased light scattering of Ag NPs.To verify the experimental results mentioned above,the light absorption and the electric field intensities |E|2 at the interface between AgNPs and Si nanoholes were simulated by using Lumerical FDTD Solutions,and the experimental results were consistent with the experiments results.2?The PEDOT:PSS/(AgNPs/SiNHs nanocomposite films)hybrid solar cells were fabricated by the spin coating.The performances of the solar cells were measured,and the performances of the devices with AgNPs were improved compared to those of the devices without AgNPs.When the etching time was 20 min,the conversion efficiency(?)was boosted to 4.8%in the case of the cells with AgNPs from 2.4%of the reference devices.Besides,a highest EQE value of 75.5%in the short-wavelength spectral region,while the value of samples without Ag NPs was only 48.0%.These enhancements were caused by the increased light absorption in the cells with AgNPs3?In order to improve the conversion efficiency of hybrid solar cells,two methods were took on the batteries.Firstly,to reduce the recombination of charge carriers,surface passivation of the SiNHs was accomplished chemically.In this way,the fill factor(FF)was increased from 39.4%to 41.6%,and the conversion efficiency had an enhancement up to 25%.Secondly,the AuNPs were introduced into the organic materials,which can boost the light absorption efficiency of the solar cells.From the absorption spectra and the photovoltaic parameters,it could be found that there was a clear enhancement of the light absorption.What's more,the conversion efficiency was increased from 5.5%for the reference cells to 6.1%for the devices with AuNPs,and the short-circuit current had an enhancement up to 7%.