退火方式及PCBM阴极修饰层对聚合物太阳电池的影响

Effects of annealing processes and the PCBM modified layer for cathode on polymer solar cells

研究了不同退火方式及PCBM阴极修饰层对聚合物太阳电池性能的影响。与前退火相比,后退火的器件性能显著提高,电池的开路电压Voc由0.36V增加到0.60V,能量转换效率η从0.85%提高到1.93%,短路电流密度Jsc和填充因子FF也有不同程度的改善;在电池的活性层与Al电极间沉积一定厚度的PCBM阴极修饰层也能改善电池的性能,当PCBM厚度为3nm时,聚合物太阳电池在100mW.cm-2强度光照下,Voc为0.59V,Jsc为6.43mA.cm-2,FF为55.1%,η为2.09%。

The effects of different annealing processes and the PCBM modified layer for cathode on polymer solar cells are investigated.The performance of the polymer solar cells treated with post-annealing process is effectively improved compared with those treated with pre-annealing process.The open circuit voltage（Voc） and energy conversion efficiency （η） of post-annealing polymer solar cells are improved from 0.36 V and 0.85% to 0.60 V and 1.93%,respectively.The short-circuit current density（Jsc） and fill factor （FF） have more or less improvement at the same time.In addition, the performance of the solar cells is also improved when a certain thickness of PCBM layer is deposited between the active layer and the Al cathode.For the solar cells with a 3 nm PCBM layer, an open circuit voltage of 0.59 V,a short circuit current density of 6.43 mA·cm-2, an fill factor of 55.1% and an power conversion efficiency of 2.09% are achieved under 100 mW·cm-2 solar simulator illumination.