NOVELTY - Method for synthesizing silver powder particles involves (a) preparing acidic aqueous silver salt solution comprising water soluble silver salt dissolved in deionized water, (b) preparing acidic aqueous reducing and particle modifier solution including reducing agent e.g. ascorbic acid, (c) maintaining silver salt solution and modifier solution at same temperature, (d) adding the silver salt solution to modifier solution, stirring solution and maintaining reaction mixture, and (e) increasing temperature of final aqueous solution while continuously stirring solution.    USE - The method is useful for synthesizing silver powder particles used in silver thick film paste, which is used in solar cell (all claimed).    ADVANTAGE - The method produces spherical-shaped silver powder particles with small-sized crystallites having particle size of less than or equal to 32, preferably less than or equal to 30 nm as determined by X-ray diffraction and Scherrer formula, and having d50 particle size of 0.5-3.5 mu m to provide silver thick film paste with improved sintering properties, size distribution such that (d90-d10)/d50 is less than 2.2, solids content in excess of 99% as determined by thermogravimetric analysis.    DETAILED DESCRIPTION - Method for synthesizing silver powder particles involves (a) preparing acidic aqueous silver salt solution comprising water soluble silver salt dissolved in deionized water, (b) preparing acidic aqueous reducing and particle modifier solution comprising (i) reducing agent chosen from ascorbic acid, ascorbates and its mixtures, (ii) nitric acid, (iii) maleic acid and (iv) deionized water, where the pH of the acidic aqueous reducing and particle modifier solution is adjusted using base (2.5-6), (c) maintaining the acidic aqueous silver salt solution and acidic reducing and surface morphology modifier solution at same temperature, where the temperature is at 10-65 degrees C, while stirring each solution during and after preparation, (d) adding the acidic aqueous silver salt solution to acidic aqueous reducing and particle modifier solution and stirring the solution to prepare reaction mixture and maintaining reaction mixture at the above-mentioned temperature to obtain solution containing silver powder particles precipitate, and (e) increasing the temperature of the final aqueous solution to 65-80 degrees C while continuously stirring the solution, where one or both of the acidic aqueous silver salt solution and acidic aqueous reducing and particle modifier solution further comprises gum arabic. An INDEPENDENT CLAIM is included for solar cell.