期刊
MACROMOLECULES
卷 54, 期 15, 页码 7102-7112出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.1c01215
关键词
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资金
- National Research Foundation of Korea [NRF-2020M3D1A2102869, 2020M3H4A1A02084906]
- Korea Research Institute of Chemical Technology (KRICT)
- Ministry of SMEs and Startups of the Korean Government [1425144083]
- National Research Foundation of Korea [2020M3H4A1A02084906] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Interlayers in organic solar cells play a critical role in determining their performance, efficiency, and stability. In this study, two NDI-based n-type polymers with OEG side chains were designed as new electron transport layers in OSCs, showing enhanced efficiency and reproducibility compared to traditional ETLs. The OEG-based ETLs also exhibited higher storage stability and better film uniformity, providing valuable insights for the fabrication of high-performance and stable OSCs.
Interlayers in organic solar cells (OSCs) play a crucial role in determining their charge extraction properties, device performance, and stability. In this work, two naphthalene diimide (NDI)-based n-type polymers (P(NDIDEG-T) and P(NDITEG-T)) incorporating oligo(ethylene glycol) (OEG) side chains of different lengths are designed and used as new electron transport layers (ETLs) in OSCs. The hydrophilic OEG side chains enable the processing of these n-type polymers using eco-friendly water/ethanol mixtures. In addition, the polar OEG groups effectively modify the work function of the Ag cathode, enabling the polymers to function as efficient ETLs. Consequently, when these OEG-based ETLs are applied to PM6:Y6-based OSCs, a maximum power conversion efficiency (PCE) of 15.43% is achieved, which is substantially higher than that of a reference OSC without an ETL (9.93%) and comparable to that of an OSC with a representative high-performance PFN-Br ETL (15.34%). We demonstrate that 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 compared to 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.
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