▎ 摘　　要

Graphene (GN) doping concentration and annealing temperature in blended poly (3-hexylthiophene) and [6,6]-phenyl C61 butyric acid methyl ester (P3HT/PCBM) with GN (P3HT/PCBM/GN) based organic solar cells (OSC) were investigated. Results indicate the power conversion efficiency (PCE) of P3HT/PCBM/GN based OSC can be efficiently increased by 3 wt% GN doping and 120 degrees C annealing. The OSC doped with 3 wt% GN exhibited the highest PCE among OSC doped with 0 similar to 10 wt% GN under the same annealed condition: unannlealed status and 120 degrees C annealing. The PCE of 120 degrees C annealed OSC doped with 3 wt% GN is 2.81, which is almost two times higher than that doped with 10 wt% GN. Thermal desorption spectra of unannealed P3HT/PCBM /3 wt% GN show two desorption peaks at around 130 and 182 degrees C resulting from water vapor. The two temperatures are close to the glass transition temperature of PCBM and melting temperature of P3HT, respectively. The 120 degrees C annealing on P3HT/PCBM/3 wt% GN can make both P3HT and PCBM have relatively good crystallization compared with unannealed status and 170 degrees C annealing. Good crystallization makes charge carriers transport easily in P3HT/PCBM/3 wt % GN based OSC.