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    Mesoporous silica hybrids as an antireflective coating to enhance light harvesting and achieve over 16% efficiency of organic solar cells

    Year: 2019

    Journal: J. Mater. Chem. C, Volume 7, DEC 21, page 14962–14969

    Authors: Wang, Yalun; Chen, Mengxue; Li, Donghui; Huang, Zhiwei; Mao, Yuchao; Han, Wenjiao; Wang, Tao; Liu, Dan

    Organizations: Natural Science Foundation of Hubei ProvinceNatural Science Foundation of Hubei Province [2019CFB575]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21774097]

    Grafted with hexamethyldisiloxane (HMDS), mesoporous silica nanoparticle (MSN) hybrids have been synthesized and explored as an antireflective coating (ARC) to enhance the power conversion efficiency (PCE) of non-fullerene organic solar cells (OSCs). The ARC consisting of HMDS-MSN hybrids and silica oligomer binders can increase the transmittance of the OSC glass substrate from a maximum value of around 90% to 95%, allowing more visible light to be absorbed by the photoactive layer of OSCs and be converted to free charges. After coating of an ARC, the short-circuit current density and PCE of PBDB-T:ITIC OSCs increased from 15.5 mA cm(-2) and 9.7% to 16.1 mA cm(-2) and 10.1%, with those of PBDB-T-2F:BTP-4F OSCs increasing from 25.2 mA cm(-2) and 15.4% to 26.7 mA cm(-2) and 16.2%, which is among the highest reported efficiency of single-junction OSCs in the literature. Meanwhile, the fill factor and open-circuit voltage of those OSCs remain unaffected. Our results suggest that an ARC is a superior approach to enhance the efficiency of organic solar cells.
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