NOVELTY - A cross-linked pair of polymerizable monomer units contains polymerizable units, linkers, and electrofunctional unit.    USE - Useful in the preparation of an electrofunctional unit cross-linked polymer (claimed) for a photovoltaic device (claimed).    ADVANTAGE - The structure enables interaction between the porphyrin moiety and the conducting polymer or copolymer with significantly reduced disruption of the polymer or copolymer. The copolymers demonstrate enhanced photovoltaic performance. The porphyrin cross-linked polymers have enhanced photovoltaic and electron transfer performance compared to other porphyrin-containing structures, and provide conducting polymers sensitive to chemicals capable of binding to the porphyrin or other tetrapyrrolic macrocycle.    DETAILED DESCRIPTION - A cross-linked pair of polymerizable monomer units has a structure Q(L)nP(L')mQ' (I).    Q, Q'=polymerizable units;    L, L'=linkers providing direct or indirect electronic communication between P and Q and Q';    P=electrofunctional unit; and    m, n=0-3.    INDEPENDENT CLAIMS are also included for:    (a) a cross-linked quartet of polymerizable monomer units, having a structure of formula (II);    (b) an electrofunctional unit cross-linked polymer, comprising a structure of formula (III) or (IV);    (c) an electrofunctional material, including a base material; and the electrofunctional unit cross-linked polymer or a copolymer;    (d) a method of preparing the electrofunctional material, comprising treating the base material with the cross-linked pair or quartet of polymerizable monomer units; and subsequently polymerizing the cross-linked pair or quartet of polymerizable monomer units;    (e) a method of light harvesting, comprising applying the polymer or copolymer to a surface; applying light to the resultant surface, or exposing the surface to light; and capturing the resultant current; and    (f) a photovoltaic device incorporating the electrofunctional unit cross-linked polymer.