Discipline: Nanoscience
Subcategory: Materials Science
Session: 1
Room: Exhibit Hall A
Tia Wright - Fayetteville State University
Co-Author(s): Michael Rose, Fayetteville State University, Fayetteville,NC; Bhoj Gautam, Fayetteville State University, Fayetteville, NC.
Both morphology and chemical composition (e.g. fluorination) of charge transfer copolymers impact power conversion efficiency in bulk heterojunction solar cells. Here we used absorption and emission spectroscopy to elucidate the impact of these differences on the aggregation behavior of medium band gap copolymers (PBnDT-XTAZ, where X= F or H). We observed the differences in optical cross section strengths for their 0-0 and 0-1 vibronic transitions. This suggests that intrachain and interchain electronic coupling depends on the choice of solvent used and the molecular chemistry. These differences due to morphological and chemical structure variations can impact the photovoltaic performance of the bulk heterojunction made from these polymers.
Funder Acknowledgement(s): This work was supported by NSF RIA 1900998.
Faculty Advisor: Bhoj Gautam, bgautam@uncfsu.edu
Role: Sample preparation, data collection, and data analysis.