STUDY EFFECT OF SURFACE PLASMON RESONANCE (SPR) FROM GOLD NANOPARTICLES TO ENHANCE HYBRID BULK HETEROJUNCTION SOLAR CELL PERFORMANCE
Organic solar cells are second generation solar cells that have advantages in terms of cheap and easy fabrication, flexibility compared to inorganic solar cells. However, its efficiency is still low. In general, organic solar cells have a Planar Heterojunction (PHJ) configuration, but in its develop...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/45272 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Organic solar cells are second generation solar cells that have advantages in terms of cheap and easy fabrication, flexibility compared to inorganic solar cells. However, its efficiency is still low. In general, organic solar cells have a Planar Heterojunction (PHJ) configuration, but in its development, solar cell configurations are accommodated using Bulk Heterojunction (BHJ) structure, using organic-inorganic hybrid materials, using inverted configurations to improve the efficiency of the device's performance. The mechanism of organic solar cells involves electronic processes such as charge transfer which are limited by diffusion length and weak absorption.
In recent years the use of metal nanoparticles has been developed into the structure of solar cell devices by utilizing the localized surface plasmon resonance effect (LSPR) of nanoparticles to assist the process of absorbing light, as well as functioning as a transport layer of electron / holes. Although this study has been carried out both in theory and experiment, the mechanism of LSPR in the device has not yet reached satisfactory results. The mechanism of solar cells in general includes the process of photons absorption by the polymer, exciton generation, exciton dissociation (electrons to the acceptor and holes to the donor), and transfer hole passes through the electron blocking layer to the anode and the electron passes through the hole blocking layer to the cathode.
In this study, we investigated the mechanism of the generation of charge carriers and their transport processes in the structure of inverted hybrid bulk heterojunction solar cells by utilizing the localized surface plasmon resonance (LSPR) effect of gold nanoparticles. The gold nanoparticles in this study were incorporated with a P3HT: PCBM polymer that functions as an active layer of a hybrid solar cell device to increase light absorption and the next processes at the interface area of the active layer.
Synthesis of gold nanoparticles using oleylamine as a stabilizing agent (AuOA) was carried out by the reduction method. Fabrication of solar cells in a structure of ITO/ZnO/P3HT:PCBM:AuOA/PEDOT:PSS/Ag was done by used of spin coating technique. Furthermore, the formation of AuOA was characterized by UV-Vis and FT-IR spectroscopy while the performance of solar cell devices was conducted by current-voltage (J-V) measurement equipped by AM 1.5G solar simulator. The absorbance spectrum of AuOA shows a plasmonic peak in the ~ 529 nm with a spherical shape and ~ 20 nm of diameter size. On the other hand, absorbance spectra of P3HT: PCBM with incorporation of AuOA shows an enhancement in absorbance band and the active polymer solution is quite stable in certain concentrations (less than 10 wt%) of AuOA. The results of J-V characterization of hybrid solar cell devices with the addition of AuOA into active layer showed an enhancement in efficiency compared to solar cell devices without AuOA. The solvent used in making Zn Ac solution and the thickness of the ZnO layer gives an influence on PCE of BHJ solar cells. Solar cells with methoxy ethanol as the solvent for Zn Ac solution with seven layers ZnO shows better performance than 2-propanol solvent. |
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