Photoinduced redox-switchable σ-holes: further application to photovoltachromic cells
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σ-hole is a phenomenon in which the atom of group 14-17 elements covalently bond with electron-withdrawing groups, inducing a positive charge on their opposite side. Despite its advantage of two-way directional σ-holes, the applications of ChB are limited due to the constraint of bond angles and weaker σ-hole intensity compared to XB. Therefore, we newly developed a photoinduced redox-switchable ChB using chalcogen bonding dyes (ChB-dyes) to overcome the limitations and promote the scalability of ChB. As a result, one of the ChB-dyes containing selenium atom (PSe) selectively attracts I−/I3− anions through photoactive σ-holes and deactivates the attraction in the absence of dye oxidation. By taking advantage of selective I−/I3− interaction and considering similarities of operating mechanism with dye-sensitized solar cells (DSCs), we integrated the photoactive σ-holes into DSCs bringing σ-hole’s practical applications as photovoltachromic cells (PVCCs).