NOVELTY - A modular semiconductor device comprises a container including a chamber provided with penetrating surface to allow passage of radiation and/or light, and an optical collating region to converge, collect or spread and diffuse the radiation and/or light. Liquid refrigerant is filled in the chamber. An evaporator having capillary unit is provided in the chamber. Part of capillary unit contacts the liquid refrigerant. A semiconductor element with driving surface is arranged in the chamber and thermally connected with the evaporator, and exposed to the liquid refrigerant.    USE - Modular semiconductor device.    ADVANTAGE - The device has enhanced heat emission function.    DETAILED DESCRIPTION - A modular semiconductor device comprises a container including a chamber provided with a penetrating surface to allow passage of radiation and/or light, and an optical collating region to converge, collect or spread and diffuse the radiation and/or light. Liquid refrigerant comprising water, methanol, ethanol, acetone, ammonia and/or chlorofluorocarbon is filled in the chamber. An evaporator having capillary unit is provided in the chamber. Part of capillary unit contacts the liquid refrigerant. The liquid refrigerant is heated by the evaporator and volatilized into gaseous refrigerant, and filled the chamber. The gaseous refrigerant is condensed on the chamber and recovered into liquid refrigerant. A semiconductor element with driving surface (preferably solar cell, illuminating diode, or heat-power generator) is arranged in the chamber and thermally connected with the evaporator, and exposed to the liquid refrigerant. An optical element, particularly optical lens, is provided in the chamber to gather and uniformly diffuse the radiation and/or light to the driving surface. The chamber wall comprises glass and/or metal materials. The optical collating region is a part of chamber wall and comprises glass material having optical reflection layer or semi-transparent coating on surface or having rough surface obtained by hydrofluoric acid erosion or sand blasting. The penetrating surface comprises glass material having semi-transparent coating on surface or having rough surface obtained by hydrofluoric acid erosion or sand blasting.