NOVELTY - Solar module (200) comprises either: photovoltaic cell (202), and resonant cavity waveguide having non-planar configuration and optically coupled to photovoltaic cell, where resonant cavity waveguide comprises outer reflector, inner reflector and emission layer disposed between outer reflector and inner reflector with respect to anti-node position; or photovoltaic cell, and spectral concentrator (206) comprising luminescent material (I), optically coupled to photovoltaic cell and including outer surface (210) having non-planar shape and facing incident solar radiation.    USE - Used as the solar module.    ADVANTAGE - The solar module has: high solar conversion efficiency and improved photon quantum efficiency by allowing higher intensities of emissions to reach photovoltaic cell and reducing or eliminating loss of emissions that are guided towards the photovoltaic cell; additional structural rigidity and environmental protection due to incorporation of the luminescent stack having encapsulants; reduced manufacturing costs because of the spectral concentrator, which allows significant reduction in silicon consumption; and improved convective cooling and reduced susceptibility to performance degradations resulting from dirt or other contamination on the outer surface, due to the non-planar configuration of the spectral concentrator.    DETAILED DESCRIPTION - Solar module comprises either: a photovoltaic cell, and a resonant cavity waveguide having a non-planar configuration and optically coupled to the photovoltaic cell, where the resonant cavity waveguide comprises an outer reflector, inner reflector and an emission layer disposed between the outer reflector and the inner reflector with respect to an anti-node position within the resonant cavity waveguide, the emission layer configured to absorb incident solar radiation and emit radiation that is guided towards the photovoltaic cell, and the emitted radiation includes an energy band having a peak emission wavelength that is substantially matched to a band gap energy of the photovoltaic cell; or a photovoltaic cell, and a spectral concentrator optically coupled to the photovoltaic cell and including an outer surface having a non-planar shape and facing incident solar radiation, where the spectral concentrator including a luminescent material is of formula ((A1)p(B1)qXm) (I).    A1 = K, Rb or Cs;    B1 = Sn (preferred), Ge or Pb;    X = Cl, Br or I;    a = 1-9, preferably 1;    b = 1-5; and    m = a+2b, preferably (1+2b).    DESCRIPTION OF DRAWING(S) - The figure shows a solar module.    Solar module (200)    photovoltaic cell (202)    Side surface (204)    Spectral concentrator (206)    Outer surface (210)