Novel Organic Photovoltaic Devices Using Chlorinated and Fluorinated Boron Subphthalocyanine Derivatives and Doctor Blade Coating Technique Optimization
Year: 2019
Type: dissertation
Abstract: This thesis explored new materials and methods for the fabrication and performance optimization of organic photovoltaic (OPV) devices. Chlorinated and fluorinated derivatives of boron subphthalocyanine (BsubPc) electron acceptors were combined with an α-sexithiophene electron donor, and structure-property relationships were characterized for optimal OPV performance. Despite overwhelming similarities in material properties, the axially fluorinated BsubPc derivative (F-BsubPc) resulted in a significantly lower (50%) power conversion efficiency (PCE) compared to its chlorinated counterpart (Cl-BsubPc). However, mixtures of Cl-BsubPc and F-BsubPc have yielded greatly improved PCE trends compared to F-BsubPc films alone. This thesis also focused on the blade coating solution deposition technique to transition towards commercially viable OPV fabrication. Considering the complex and multivariant nature of blade coating, process optimization was completed using Six Sigma methodologies. Combination of solution processed and thermally evaporated layers into one OPV device was also investigated for increased OPV absorbance.
Source: TSpace (University of Toronto)
Author: Thanmayee Mudigonda
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3180623302