With the inereasing, demand of energy, the development and utilization of new energy sources havebecome an immediate task, "he performanee of lead sulfide colloidal quantum dot solar cells has always beenimpeded by the interfaee defects of transport layer, Commonly, 1, 2-ethanedithiol ( EDT) serves as the holetransport layer in lead sulfide colloidal quantum dot solar cells, Nevertheless ,the rapid reaction during the ligandexchange process tends to generate cracks in the hole transport layer film, resulting in deereased performanee.Hence , this paper designs experiments by addingethyl acetate to the aeetonitrile solution,efieetively slow downthe ligand exchange rate , preparing high-quality hole transport layer film,This enables students to gain a deeperunderstanding of the significant role of quantum dot materials in the photovoltaie field,and ineorporate seientifieknowledge into undergraduate teaching,enhaneing their thinking and practical abilities.