Type
Text
Type
Dissertation
Advisor
koga, tadanori | sokolov, jonathan | venkatesh, t.a. | nam, chang-yong.
Date
2015-05-01
Keywords
Materials Science | bulk heterojunction solar cell, p3ht-pcbm, supercritical co2
Department
Department of Materials Science and Engineering.
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/76280
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
It is known that morphological, optical and electrical properties of polymer-fullerene nanoparticle organic photovoltaic devices (OPVs) are significantly influenced by individual and integrated structures of the components blended together as photovoltaic active layers. In many cases, conventional thermal and solvent annealing processes do not provide robust control over multi-interfacial systems; therefore, the true potentials of OPVs are still limited with these post-processing treatments available up to now. In this thesis, I report alternative use of supercritical CO2 (scCO2) as a low-temperature and green plasticization agent. A poly(3hexylthiophene)-phenyl-C61-butyric acid methyl ester (P3HT-PCBM) blend system was used as a model system, and the effects of various CO2 process conditions, thickness of the blend films, filler concentrations on the structures were investigated by using a suite of surface sensitive techniques including X-ray diffraction, neutron reflectivity, and atomic force microscopy. In addition, I performed conductivity experiments for the scCO2 treated P3HT/PCBM films, demonstrating that the defect densities, charge trap densities, and carrier concentrations are significantly improved by the optimized scCO2 condition. The understanding of the structure-property relationship would lead to development of new polymer-based OPVs. | 154 pages
Recommended Citation
Sendogdular, Levent, "Green CO2 Processing for Manipulating Structures and Electrical Properties of Organic Photovoltaic Devices" (2015). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 2206.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/2206