We investigated inverted bulk heterojunction solar cells fabricated with gold (Au) leaf as laminated top electrodes. We demonstrate that the Au leaf can be successfully transferred from a supporting poly(ethylene terephthalate) (PET) substrate to the surface of poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) because PEDOT:PSS has a sufficiently higher work of adhesion than PET. Under optimized lamination conditions, the contact between the Au leaf and the PEDOT:PSS becomes homogeneous, and the power conversion efficiency (PCE) improves. When a naphtho[1,2- c:5,6-c′]bis[1,2,5]thiadiazole-based polymer is used as the p-type semiconductor, the PCE reaches 5.07%. The laminated devices exhibit excellent stability comparable to that of evaporated devices.
ASJC Scopus subject areas
- Physics and Astronomy(all)