A novel buffer layer copper iodide (CuI)was introduced into PCDTBT,PC70BM polymer solar cells (PSCs),where the CuI acts simultaneously as of hole transport layer (HTL) and electron block layer (EBL).Through depositing the CuI between the polymer and Ag and Au anodes,the hole collection ability has been increased.By optimizing the thickness of CuI and top anode,simultaneous enhancement of short-circuit current density (J sc ),open-circuit voltage (V oc ),and fill factor (FF)has been achieved,leading to a dramatic increase of device efficiency, from 0.67% to 5.47% with 3 nm CuI and Au anode in comparison with the device without CuI. With thicker CuI,the efficiency decreases noticeably both for Au and Ag anodes due to the block effect.The result indicates that the CuI is an effective buffer layer for PCDTBT,PC70BM PSCs.%针对碘化铜在器件中既是空穴传输层,又是电子阻挡层的特点,提出在PCDTBT、PC70 BM聚合物太阳能电池中引入了碘化铜(CuI)传输层.将碘化铜淀积到顶电极银和聚合物材料之间,有效地提高了器件的空穴传输能力.实验优化了碘化铜传输层的厚度,研究了不同顶电极对聚合物太阳能电池的影响,证明了碘化铜能够同时提高电池的短路电流密度、开路电压和填充因子,因此得到了效率显著提高的太阳能电池.对于使用金电极的电池,碘化铜厚度为3 nm时,电池效率从0.67%提高到5.47%,当进一步提高碘化铜厚度时,对于金、银两种电极,电池效率均由于阻挡效应而下降.实验结果表明,碘化铜是PCDTBT、PC70 BM聚合物太阳能电池的一种有效的传输层材料.
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