▎ 摘　　要

P-type nanocomposites of reduced graphene oxide/Pt nanoparticles (NPs), rGO/Pt(NPs), were synthesized through in-situ crystallization method and applied as a novel hole transporting layer (HTL) in polymer solar cells (PSCs). Three types of rGO/Pt NPs nanocomposites were synthesized by applying ethylene glycol (EG), sodium citrate (SC) and ascorbic acid (AA) as reducing agents through the in-situ crystallization method. The physicochemical and electrochemical characteristics of rGO/Pt(NPs) nanocomposites were compared to investigate the influences of the reducing agent type. Results revealed that the reducing agent type greatly affects the elimination level of oxygen-containing functional groups from GO nanosheets, the structural disorders induced in the resulting rGOs, and the size and the dispersion homogeneity of N NPs deposited onto the rGO nanosheets. This led to considerable changes in the electrical conductivity and the charge transfer resistance of the prepared nanocomposites. The rGO/Pt(NPs) sample synthesized using EG showed the lowest sheet resistance of 15 k Omega/sq, the lowest charge transfer resistance of 81 Omega and the highest flat-band potential (U-F) of -4.82 eV. The PSCs prepared based on this sample exhibited 210 % and 35 % enhancement in PCE compared to the PSCs fabricated based on rGO/Pt(NPs) synthesized by SC and AA, respectively, due to easier charge extraction/collection. The PCE of this device was also about 10 % higher than that achieved for the reference PSC prepared using PEDOT:PSS.