Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/32943
Title: A STUDY OF DYE SENSITIZED SOLAR CELLS WITH IN-SITU POLYMERIZED POLY (3,4-ETHYLENEDIOXYTHIOPHENE) AS HOLE TRANSPORTING MATERIAL
Authors: CHENG YUEMING
Keywords: Organic dye, Hole transporting materials, PEDOT, In-situ polymerization, Dye sensitized solar cells
Issue Date: 15-Aug-2011
Source: CHENG YUEMING (2011-08-15). A STUDY OF DYE SENSITIZED SOLAR CELLS WITH IN-SITU POLYMERIZED POLY (3,4-ETHYLENEDIOXYTHIOPHENE) AS HOLE TRANSPORTING MATERIAL. ScholarBank@NUS Repository.
Abstract: Dye sensitized solar cells (DSSCs) are considered as one of the candidates to replace conventional silicon based solar cells due to the low cost and easy fabrication. Generally, high efficiency DSSCs employing iodide/triiodide redox couple in electrolyte which have toxicity and electrode corrosion problems. For long-term application consideration, solid-state DSSCs (ssDSSCs) were developed. One kind of attracting ssDSSCs is using conjugated polymer as hole transporting materials (HTMs). In this work we use in-situ polymerized poly(3,4-ethylenedioxythiophene) as HTM to develop ssDSSCs with high efficiencies. Bis-EDOT monomer molecules diffuse and polymerize in the titanium dioxide electrode to improve the HTM penetration. ssDSSCs sensitized with different indoline sensitizers D102, D131 and D149 were used to show the influence of chemical structure of sensitizer on the performance of ssDSSCs. Our studies reveal that devices based on different sensitizers obtained similar charge-collection efficiencies. The key factor for dye selection is the total light absorption ability of sensitizers. With the largest total light response, ssDSSCs with D149 as sensitizer have shown the best efficiency of 5.98% under the air mass 1.5 global (AM 1.5G) sunlight condition, while D102 and D131 based devices fabricated under the same conditions yield efficiencies of 5.17% and 2.44%, respectively. To enhance incident light utilization without changing titanium dioxide electrode thickness, the influence of nanowire scattering layer on ssDSSCs with in-situ polymerized PEDOT as HTM was investigated. Intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS) results show that the charge transporting time is decreased while the electron lifetime is increased with addition of scattering layer. As a result, ssDSSCs with a scattering layer obtained better charge-collection efficiencies. ssDSSCs with scattering layer have shown a remarkable efficiency of 6.21% under the air mass 1.5 global (AM 1.5G) sunlight condition.
URI: http://scholarbank.nus.edu.sg/handle/10635/32943
Appears in Collections:Master's Theses (Open)

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