NOVELTY - An encapsulant resin member for a semiconductor having an additive dissolved therein such that additive concentration has a gradient across the thickness of the encapsulant resin member.    USE - The encapsulant is particularly useful for encapsulating a photovoltaic element in production of solar cell modules.    ADVANTAGE - The concentration gradient of the additive allows the use of a lower amount of additive to produce the required effect than when the additive is uniformly distributed. It can also eliminate the negative effects of excess additive which may be evaporated or decomposed during lamination and form bubbles on the module surface. Antagonistic reaction between additives can also be prevented and synergistic effects promoted.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (a) Production of a semiconductor or a solar cell module, comprising stacking on a surface of a semiconductor element or photovoltaic element at least 2 types of organic polymer resin members having different concentrations of additive dissolved therein, and encapsulating the semiconductor or photovoltaic element with the resin;    (b) Production of a semiconductor or a solar cell module, comprising applying an electric field to an encapsulant resin member to effect electrophoresis of a polar additive dissolved in the encapsulant resin thereby establishing a concentration gradient of the additive across the thickness of the encapsulant resin member, and encapsulating a surface of a semiconductor or a photovoltaic element with the encapsulant resin;    (c) A semiconductor element encapsulated with an encapsulant resin wherein an additive dissolved in the encapsulant resin has a concentration gradient across the thickness of the encapsulant resin;    (d) Production of a semiconductor element encapsulated with an encapsulant resin, comprising providing an additive dissolved in the encapsulant resin with a concentration gradient across the thickness of the encapsulant resin.