Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 11, Issue 4, Pages 1810-1816Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta07856b
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Glucose was used to passivate free OH traps of ZnO through hydrogen-bonding interaction, which improved the electron extraction capability and reduced the trap defect density. As a result, high efficiency in organic solar cells was achieved.
Electron transport layers (ETLs) with excellent electron extraction capability are essential for realizing high efficiency in organic solar cells (OSCs). A sol-gel-processed ZnO ETL is widely used in OSCs due to its high mobility and suitable work function. However, the existence of defects usually results in low photovoltaic performance during the operation of OSCs. In this work, glucose (Gl) was used to passivate free OH traps via hydrogen-bonding interaction and formed ZnO/Gl ETLs with ZnO, which exhibited improved electron extraction capability and reduced trap defect density. Thus, a champion efficiency of 18.03% was obtained in a PM6:Y6 light absorber-based cell, which is >11% higher than that of the reference cell (16.15%) with a pristine ZnO ETL. Impressive enhancements by >11% were also observed in different fullerene and non-fullerene light absorber-based cells relative to that of the reference cell. This study demonstrates a new strategy to design ETLs for realizing high efficiency in OSCs.
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