Study of High-efficiency Flexible Polymer Solar Cells Based on PET Substrates
Date Issued
2009
Date
2009
Author(s)
Tsai, Kao-Hua
Abstract
Conjugated polymer-based organic solar cells have attracted considerable attention in recent years because they have many advantages, such as low-cost, processing with low temperature, flexibility, large area production and so on. In this study, we use poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) to fabricate the conventional polymer solar cells on glasses. The hole conductive layer (PEDOT:PSS) is modified to increase its conductivity and improve the device performance. However, the conventional structure has the disadvantages of the high annealing temperature of the active layer and the etching reaction of the PEDOT:PSS with ITO. The efficiency of the conventional polymer solar cell on polyester (PET) is very low. Besides, the efficiency of the conventional polymer solar cell in air decreases very fast with time. he inverted polymer solar cell on PET substrate with a non-annealing active layer is investigated. The atomic force microscope images show that the morphology of the non-annealing active layer of the inverted plastic solar cell evolves with time, which improves the performance of the solar cell. The easily processed inverted device with a non-annealing active layer on the indium-tin-oxide coated PET substrate exhibits a high power conversion efficiency of ~3.66%, which is comparable to the device on the glass substrate. Besides, we use the new materials Plexcore® PV2000 to fabricate the inverted polymer solar cells on PET and have a high power conversion efficiency of ~3.83%. The inverted structure has air-stable characteristics and can be processed easily, so it has the potential for polymer solar cells on PET substrates.
Subjects
PET substrate
polymer
flexible solar cells
bulk heterojunction structure
anneal
Type
thesis
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