Refined Vertical Phase Separation in Layer-by-Layer Organic Solar Cells through Independent Processing Additive Control
발표자
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초록
내용
In organic solar cells (OSC), the morphology transition of the photoactive layer is the key factor influencing device performance of OSC. Many studies are addressing the key factor through solvents, additives, and ternary strategies, but a precise understanding of the impact on morphology is still limited by issues such as vertical phase separation and poor miscibility between donor and acceptor. To mitigate this, we conduct independent additive control for morphology optimization of OSCs using the polymer donor, PM6, and the non-fullerene acceptor, BTP-eC9, via the sequential deposition method. The morphology transition of the active layer is monitored using grazing incident wide-angle X-ray (GIWAXS), Time-of-flight secondary ion mass spectrometry (ToF-SIMS). Furthermore, nanosecond transient absorption spectroscopy (ns-TAS) is employed to investigate the behavior of the charge carrier dynamics.