conducted a study focusing on boosting the efficiency of inverted polymer solar cells using electrodeposited n-type Cu₂O ESTLs. ln this study, n-Cu₂O electrons selective transport layers (ESTL) was incorporated to the inverted device to be the structure of SS/n-Cu₂O/P3HT:PCBM/PEDOT:PSS/Au. However, the performance of the solar cells decreased in the presence of n-Cu₂O ESTL. This may be due to the increased internal resistance. The devices fabricated with n-Cu₂O ESTL annealed at 175⁰C increased the PEC from 0.08 to 0.35%. The improved performance can be attributed to enhanced photo response, and Jsc. The photoresponse spectrum improved significantly after the presence of n-Cu₂O ESTL due to the enhanced electron transferability. The pre-annealing treatment of n-Cu₂O ESTL may have tuned the crystallinity, grain boundary condition and defects condition which led to the Jsc increment.