Effect of Thermal Stress on Morphology in High-Performance Organic Photovoltaic Blends.

ABSTRACT: Thermal stress is a critical factor causing long-term instability in bulk heterojunction (BHJ) layers of organic photovoltaic (OPV) devices. This study provides direct insights into the thermal properties of Y6, PM6, and their binary blends by employing fast differential scanning calorimetry (flash DSC) to analyze their chain dynamics. The glass transition temperatures (T _g) of Y6 and PM6 were measured, with Y6 exhibiting a T _g of 175.2 °C and PM6 showing two T _gs at 39.7 and 107.6 °C. Our findings indicate that average OPVs' operational temperatures are lower than the blend's primary T _g of 138.2 °C. Thus, the mobility of PM6 and Y6 is not the critical factor that results in drastic drifts in the device morphology. In

SUBMITTER: Zhao H 

PROVIDER: S-EPMC11600174 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature