Journal
NANOSCALE
Volume 13, Issue 25, Pages 11128-11137Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr09090e
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Funding
- National Natural Science Foundation of China [12047537, 12074229, 62075155]
- Chinese Postdoctoral Science Foundation [2017M622251]
- Shandong Provincial Natural Science Foundation, China [ZR2017BF027, ZR2018MA040]
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Sarcosine as an ETL successfully improved the performance of inverted organic solar cells by reducing the work function and increasing surface energy of ITO or ITO/ZnO, optimizing the morphology and molecular arrangement of the active layers, promoting charge transport and collection, and ultimately enhancing the power conversion efficiency.
The natural biomaterial sarcosine as an electron transport layer (ETL) to modify ITO or ITO/ZnO was successfully introduced into inverted organic solar cells (OSCs) with PM6:BTP-BO-4Cl as the active layer. The introduction of sarcosine on the surface of ITO or ITO/ZnO resulted in lower work function (WF) and higher surface energy. The active layers processed on the surfaces of ITO or ITO/ZnO presented a more optimized morphology and a more ordered molecular arrangement after their modification with sarcosine. The introduction of sarcosine as an ETL promoted charge transport and collection in the OSCs. Therefore, the power conversion efficiency (PCE) of the OSCs increased to 13.53% from 3.86% by modifying ITO with sarcosine. The PCE of the OSCs with ZnO as ETLs improved to 16.45% from 14.85% by modifying ZnO with sarcosine. The improved PCEs benefited from the simultaneously improved short-circuit current density (J(SC)), fill factor (FF), and open-circuit voltage (V-OC). Therefore, this work demonstrates that sarcosine has great potential as an ETL to improve the performance of OSCs.
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