NOVELTY - Solar cell module comprises a solar cell assembly comprising at least one solar cells and a poly(vinyl butyral) encapsulant, where the solar cell assembly further comprises a metal component, which comprises an oxidizable elemental metal and is in contact with the poly(vinyl butyral) encapsulant, and the poly(vinyl butyral) encapsulant comprises a poly(vinyl butyral) polymer, at least one plasticizers (15-45 wt.%) and at least one aldehyde scavengers (0.1-2 wt.%), based on the total weight of the poly(vinyl butyral) encapsulant.    USE - The solar cell module is useful for converting solar energy to electricity.    ADVANTAGE - The solar cell module utilizes the poly(vinyl butyral) encapsulate, which exhibits reduced yellowing after prolonged contact with silver-containing components of the solar cell module.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a pre-lamination assembly for preparing a solar cell module, comprising the solar cell assembly, and a poly(vinyl butyral) sheet having a thickness of 0.25-1.2 mm and comprising a poly(vinyl butyral)encapsulant, which comprises a poly(vinyl butyral) resin, at least one plasticizers (15-45 wt.%) and at least one aldehyde scavengers (0.1-2 wt.%), based on the total weight of the poly(vinyl butyral) encapsulant, optionally where the poly(vinyl butyral) sheet has a yellowness index of less than or equal to 60 when measured in accordance with ASTM E313-05 after 1000 hours under a bias of 1000V and at 85 degrees C and 85% relative humidity, and the poly(vinyl butyral) sheet is in contact with the metal component; and (2) reducing or preventing discoloration of poly(vinyl butyral) encapsulant in a solar cell module, comprising: providing the poly(vinyl butyral) sheet comprising the poly(vinyl butyral) encapsulant; forming a solar cell module by encapsulating a solar cell assembly in the poly(vinyl butyral) sheet, where the solar cell assembly comprises a metal component that is in contact with the poly(vinyl butyral) sheet; and operating the solar cell module under a set of conditions for a period of time, where the yellowness index of the poly(vinyl butyral) encapsulant will be unchanged after the period of operation, or the change in the yellowness index of the poly(vinyl butyral) encapsulant after the period of operation is smaller than the change in the yellowness index of a second poly(vinyl butyral) encapsulant after the same period of operation under the same set of conditions in a second solar cell module that is substantially identical to the solar cell module, and the second poly(vinyl butyral) encapsulant does not comprise an unsaturated heterocyclic compound.