The purpose of this research is to learn how to deposit gold layer for Perovskite solar cell (PSC). PSC was manufactured layer by layer and eventually, a manmade device was used to deposit gold layer as a cathode on hole transport material (HTM), with thermal evaporation technique. An ethanol based nanofluid containing a commercial anatase TiO₂ particles with the sizes of around 20 nm was prepared. A compact TiO₂ layer was first spin-coated and subsequently sintered to stabilize particles on FTO glass. In the second step, the anatase TiO₂ nanofluid was deposited, using spin coater technique and sintered to form an electron transport layer. The Perovskite and Spiro-OMeTAD as a HTM were successively deposited with a spin-coater in a glove box at a humidity of less than 20 %. Regarding the gold evaporation, the distance between source and substrate of the thermal evaporation device was 7 cm. One-step gold deposition was conducted at a pressure of 2 × 10^-3 Pa and the source power was adjusted to form gold layer. It was observed that the deposition condition of gold layer had a significant impact on efficiency of PSC, consisting of FTO glass/buffer layer-TiO₂ /nanocrystalline-TiO₂/Perovskite/Spiro-OMeTAD/Au. Knowing that, this study investigated the effects of deposition, such as the thickness of gold layer on light-to-electricity conversion efficiency of PSC in order to optimize the device performance.