退火处理对P3HT与PCBM共混体系的有机太阳能电池的影响

Effect of Annealing Treatment on P3HT∶PCBM Blend Organic Solar Cell

有机太阳能电池是新型太阳能电池的研究热点之一。从紫外-可见光谱、X射线衍射及太阳电池光电性能方面,分析了退火处理对具有聚三己基噻吩(P3HT)与6,6-苯基-C61-丁酸甲酯(PCBM)共混层的太阳能电池性能的影响。紫外可见光谱表明,退火处理使P3HT与PCBM共混体系所成膜的吸收峰增强并红移,有利于增加器件对太阳光的吸收范围。X射线衍射图表明退火处理使P3HT结晶性增强,有利于提高空穴的传输能力。活性层吸收光强度的增加及电荷传输能力的增大是退火器件性能提高的根本原因。退火处理使得太阳能电池器件光电转换效率提高2倍。其退火处理的太阳能电池在100mW.cm-2强度光照下,开路电压为0.62 V,短路电流密度为5.85 mA.cm-2,填充因子为61.3%,能量转换效率为2.29%。

The study of organic solar cell is one hotspot of new type solar cell.We study the annealing treatment effect on the performances of solar cell devices with poly（3-hexylthiophene）（P3HT） and 6,6-phenyl C61-butyric acid methyl ester（PCBM） blend system by UV-Vis absorption spectroscopy and X-ray diffraction.The UV-Vis absorption peaks of P3HT∶PCBM thin film showed enhancement and a red-shift after annealing,which is benefitial to increasing absorption intensity of sun light for the device.The XRD peak of P3HT appeared in the P3HT∶PCBM blend system by annealing treatment,which is benefitial for the hole transport due to the crystalline of P3HT.So the device performance improved were due to the increase of light absorption and charge transport enhancements for the P3HT∶PCBM blend system by annealing treatment.The power conversion efficiency（PCE） of the solar cell with P3HT∶PCBM blend system was double improved by annealing treatment.For the devices with annealing treatment,open circuit voltage of 0.62 V,short circuit current density of 5.85 mA·cm-2,fill factor of 61.3% and power conversion efficiency（PCE） of 2.29% were achieved under 100 mW·cm-2 illumination.