“…However, in terms of the structure–properties relationship, as a result of the twisted spiro carbon atom at the center of the Spiro‐OMeTAD structure, intermolecular π–π interactions and those within moieties connected by the spiro center are significantly inhibited, and in consequence, Spiro‐OMeTAD has fairly low hole conductivity . To enhance the conductivity of Spiro‐OMeTAD, numerous additives have been used, including oxygen, SnCl 4 , ( p ‐BrC 6 H 4 ) 3 NSbCl 6 , Co III complexes, protic ionic liquids, lithium bis(trifluoromethanesulfonyl)imide (Li‐TFSI), silver bis(trifluoromethanesulfonyl)imide (Ag‐TFSI), tetrafluorotetracyanoquinodimethane (F4TCNQ), and 1,1,2,2‐tetracholoroethane (TeCA), all of which significantly enhance device performance in ssDSCs. Benzoquinone‐based 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) (Figure S2) as a strong electron acceptor is easily hydrogenated by an electron donor to form a donor–DDQ complex .…”