Fabrications of Organic Polymer/Inorganic Semiconductor Hybrid Solar Cells
Date Issued
2009
Date
2009
Author(s)
Wang, Ding-shin
Abstract
In this study, we focus on fabrications of organic polymer/Inorganic semiconductor hybrid solar cells. In the first part of the work, large-area GaAs nanowires are fabricated using SiO2 nanoparticles monolayer as the etching mask. SiO2 nanoparticles monolayer is spin-coated on the GaAs substrate. To obtain a uniform monolayer of SiO2 nanoparticles across the substrate, raised temperature, adequate solution concentration, and the substrate treated with a solvent for interface activation are required. With the monolayer of SiO2 nanoparticles as the etching mask, the GaAs substrate is etched by Induced-Coupled Plasma Reactive Ion Etcher to form GaAs nanowires with a high aspect ratio. The diameter and length of GaAs nanowires can be controlled by the size of SiO2 nanoparticles and etching time of ICP-RIE. Then, we transferred GaAs nanowires onto the glass substrate with the P3HT:PCBM. We combined GaAs nanowires with P3HT:PCBM to fabricate conjugated polymer-based organic solar cells.n the second part of the work, we used solution process to replace deposition to spin NiO layer on polymer. NiO layer acts as an interfacial electron-blocking layer/hole-transporting layer (EBL/HTL). Utilizing its higher LUMO (lowest unoccupied molecular orbital) could block electron leakage to anode to recombine with hole. The leakage current is reduced to improve the power conversion efficiency of inverted structure with organic polymer/ZnO semiconductor hybrid solar cells. Our investigations show that utilizing NiO as an interfacial layer increases the shunt resistance from 502 W-cm2 to 632 W-cm2 , the filling factor from 53 % to 59 % , and the power conversion efficiency from 3.3% to 3.8%. Besides, the stability in the air of cells with NiO film has good performance. After 60 days, the power conversion efficiency of the cell reaches constant with 2.91%.
Subjects
gallium arsenide nanowire
SiO2 nanoparticles
polymer
hybrid solar cells
bulk heterojunction structure
electron blocking layer
Type
thesis
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