Fig. 1: Tensile testing of BHJ films based on different electron acceptor materials.
From: Multi-scale mechanical properties of bulk-heterojunction films in polymer solar cells
a Molecular structures of the photovoltaic materials used in the study. b Schematic illustration of the tensile test of films on water. The film is firstly spin-coated on the substrate, then etched into a dog-bone shape by laser etching, and finally, a high-precision force sensor and a linear displacement stage are used for data acquisition. The stress-strain curves of c PM6, d PTB7-Th, and e D18-Cl-based blend layers. f Schematic diagram of the films under no stress and fracture.
