Electron Transporting Layers Based on OEG-Incorporated Polymers Enabling Reproducible Fabrication of High-Performance Organic Solar Cells
발표자
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초록
내용
Two NDI-based polymers, P(NDIDEG-T) and P(NDITEG-T), incorporated with different lengths of oligoethylene glycol (OEG) side chains are used as electron transporting layers (ETLs). By depositing the ETLs on PM6:Y6 with eco-friendly water/ethanol co-solvents, a power conversion efficiency (PCE) of 15.43% is achieved, which is substantially higher than that of an OSC without an ETL (9.93%) and comparable to that of an OSC with a representative PFN-Br ETL (15.34%). The P(NDIDEG-T)–based OSCs show both enhanced PCEs and better reproducibility than their P(NDITEG-T)–based counterparts, which are attributed to the lower surface tension and improved film uniformity of the P(NDIDEG-T) ETL. Also, the P(NDIDEG-T) ETL realizes OSCs with higher storage stability and more thickness-tolerant performance than the P(NDITEG-T) and PFN-Br ETLs. Our study provides useful guidelines for the design of ETLs suitable for the fabrication of high-performance, reproducible, and stable OSCs.