研究了聚乙烯吡络烷酮(PVP)作为阴极缓冲层对P3HT/PCBM基聚合物太阳能电池光电性能的影响.PVP分别溶于二甲基乙酰胺(DMAC)、N-甲基吡咯烷酮(NMP)、乙二醇乙醚、丙酮等不同溶剂中,研究了其旋涂过程及其对活性层薄膜的影响.结果表明:PVP作为P3HT∶ PCBM的阴极缓冲层,由于其产生的自集聚效应使活性层与阴极之间形成良好的欧姆接触,有利于电子的传输.当在活性层上面旋涂溶于N-甲基吡咯烷酮(NMP)的聚乙烯吡络烷酮(PVP)的溶液时,聚合物太阳能电池的开路电压Voc为0.57 V,短路电流为Jsc为10.9 mA/cm2,填充因子FF为62％,能量转换效率PCE为3.95％.与未加阴极缓冲层PVP的标准电池器件效率(2.62％)相比,效率提高了50％.
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