混合溶剂对基于PCDTBT∶PC71BM光伏器件性能的影响

Effects of Mixed Solvents on PCDTBT∶PCB71M-based Solar Cells

摘要:

选用聚[9-(1-辛基壬基)-9H-咔唑-2,7-二基]-2,5-噻吩二基-2,1,3-苯并噻二唑-4,7-二基-2,5-噻吩二基](PCDTBT)作为电子给体, [6,6]-苯基-碳71-丁酸甲酯(PC71BM)作为电子受体, 分别以邻二氯苯(ODCB)、氯仿(CF)以及邻二氯苯/氯仿(ODCB/CF)不同比例混合溶剂作为活性层溶剂制备有机薄膜太阳电池, 研究了不同溶剂对光伏电池光电性能的影响。结果表明: 合适比例的ODCB/CF(1/1)作为溶剂对制备的光伏器件紫外吸收光谱和外量子效率曲线都起到了积极的作用, 此时器件能量转换效率最高, 为2.28%, 较单一溶剂ODCB下制备的器件效率提高了42%。通过原子力显微镜表征发现此时器件光活化层有较好的相分离。

Abstract:

Solar cells based on blends of PCDTBT as the donor and PC71BM as the acceptor were fabricated using all kinds of solvents such as ODCB, CF and mixed solvent(ODCB/CF) with different ratios. The effects of different solvents on the performance of batteries were stydied. The experiments show that appropriate proportion of ODCB / CF (1/1) as a solvent plays a positive role in the UV-Vis absorption spectrum and external quantum, thus the device can own the highest energy conversion efficiency of 2.28%, which is 42% higher than that of the device fabricated with single solvent ODCB. AFM images show that the photoactivation layer can ralize better phase separation.