We report the efficiency enhancement of polymer solar cells by incorporating a silver nanodisks' self-assembled layer, which was grown on the indium tin oxide (ITO) surface by the electrostatic interaction between the silver particles and modified ITO. Polymer solar cells with a structure of ITO (with silver nanodisks)/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) (Clevious P VP AI 4083)/poly(3-hexylthiopbene):[6,6]-phenyl-[C61] butyric acid methyl ester (P3HT:PC61BM)/LiF/Al exhibited an open circuit voltage (V-OC) of 0.61 +/- 0.01 V, short-circuit current density (J(SC)) of 9.24 +/- 0.09 rnA/cm(2), a fill factor (FF) of 0.60 +/- 0.01, and power conversion efficiency (PCE) of 3.46 +/- 0.07% under one sun of simulated air mass 1.5 global (AM1.5G) irradiation (100 mW/cm(2)). The PCE was increased from 2.72 +/- 0.08% of the devices without silver nanodisks to 3.46 +/- 0.07%, mainly from the improved photocurrent density as a result of the excited localized surface plasmon resonance (LSPR) induced by the silver nanodisks. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.