NOVELTY - The module (10) has a hollow funnel portion (34) focusing solar rays onto a quadrangular receiver die and including a first section (42). The first section extends from a quadrangular base portion and transitions to a second section (44) that defines a distal rim (46), where the first section comprises quadrangular cross-sectional configuration and increasing length and width dimensions from an opening in a horizontal top wall to the second section. The second section comprises a circular cross-sectional configuration and increasing diameter from the first section to the rim.    USE - Concentrated photovoltaic (CPV) module.    ADVANTAGE - The module provides a reflective internal surface of the funnel portion created by material from which the funnel portion is fabricated or application of the reflective film to the inner surface is operative to guide focused solar rays to the front surface of the receiver die, which is aligned with the first section of the funnel portion. The module realizes gradual shape transformation of the funnel portion from the circular second section to a quadrangular or square end of the first section integrally connected to the top wall of the base portion to reduce geometry mismatch between a circular focused spot shape and a square-faced prism, thus improving light gathering efficiency of the light guide. The light guide includes the hollow funnel portion as an alternative to a solid glass prism, thus reducing internal absorption loss in the CPV module since solar rays are channeled to the front surface of the receiver die through the funnel portion without utilizing different materials such as optical adhesive materials, to attach the prism to the receiver die, and hence reducing Fresnel reflective loss in the CPV module as a result of inclusion of the light guide.    DETAILED DESCRIPTION - The first section is a lower section. The second section is upper section.    DESCRIPTION OF DRAWING(S) - The drawing shows a top perspective view of a CPV module.    CPV module (10)    Substrate (12)    Hollow funnel portion (34)    Sections (42, 44)    Distal rim (46)