Papamakarios Vasilis, Polydorou Ermioni, Soultati Anastasia, Droseros Nikos, Tsikritzis Dimitris, Douvas Antonios M, Palilis Leonidas, Fakis Mihalis, Kennou Stella, Argitis Panagiotis, Vasilopoulou Maria
Institute of Nanoscience and Nanotechnology (INN), National Center for Scientific Research Demokritos , 15310 Aghia Paraskevi Attikis, Athens Greece.
ACS Appl Mater Interfaces. 2016 Jan 20;8(2):1194-205. doi: 10.1021/acsami.5b09533. Epub 2016 Jan 6.
Modifications of the ZnO electron extraction layer with low-pressure H plasma treatment increased the efficiency of inverted polymer solar cells (PSCs) based on four different photoactive blends, namely, poly(3-hexylthiophene):[6,6]-phenyl C71 butyric acid methyl ester (P3HT:PC71BM), P3HT:1',1″,4',4″-tetrahydro-di[1,4]methanonaphthaleno-[5,6]ullerene-C60 (P3HT:IC60BA), poly[(9-(1-octylnonyl)-9H-carbazole-2,7-diyl)-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]:PC71BM (PCDTBT:PC71BM), and (poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-(2-ethylhexy)carbonyl]thieno[3,4-b]thiophenediyl]]):PC71BM (PTB7:PC71BM), irrespective of the donor:acceptor combination in the photoactive blend. The drastic improvement in device efficiency is dominantly attributable to the reduction in the work function of ZnO followed by a decreased energy barrier for electron extraction from fullerene acceptor. In addition, reduced recombination losses and improved nanomorphology of the photoactive blend in the devices with the H plasma treated ZnO layer were observed, whereas exciton dissociation also improved with hydrogen treatment. As a result, the inverted PSC consisting of the P3HT:PC71BM blend exhibited a high power conversion efficiency (PCE) of 4.4%, the one consisting of the P3HT:IC60BA blend exhibited a PCE of 6.6%, and our champion devices with the PCDTBT:PC71BM and PTB7:PC71BM blends reached high PCEs of 7.4 and 8.0%, respectively.
采用低压氢等离子体处理对氧化锌电子提取层进行改性，提高了基于四种不同光活性共混物的倒置聚合物太阳能电池（PSC）的效率，这四种共混物分别是聚（3 - 己基噻吩）：[6,6] - 苯基C71丁酸甲酯（P3HT:PC71BM）、P3HT:1',1″,4',4″ - 四氢 - 二[1,4]亚甲基萘并[5,6]富勒烯 - C60（P3HT:IC60BA）、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]：PC71BM（PCDTBT:PC71BM）以及（聚[[4,8 - 双[（2 - 乙基己基）氧基]苯并[1,2 - b:4,5 - b']二噻吩 - 2,6 - 二基][3 - 氟 - 2 - （2 - 乙基己基）羰基]噻吩并[3,4 - b]噻吩二基]]）：PC71BM（PTB7:PC71BM），与光活性共混物中的供体 - 受体组合无关。器件效率的显著提高主要归因于氧化锌功函数的降低以及从富勒烯受体提取电子的能垒减小。此外，在具有氢等离子体处理的氧化锌层的器件中，观察到光活性共混物的复合损失减少且纳米形貌得到改善，同时激子解离也因氢处理而得到改善。结果，由P3HT:PC71BM共混物组成的倒置PSC表现出4.4%的高功率转换效率（PCE），由P3HT:IC60BA共混物组成的PSC表现出6.6%的PCE，而我们采用PCDTBT:PC71BM和PTB7:PC71BM共混物的最佳器件分别达到了7.4%和8.0%的高PCE。
