Liu Chang, Zhang Lin, Xiao Liangang, Peng Xiaobin, Cao Yong
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology , 381 Wushan Road, Guangzhou 510640, China.
ACS Appl Mater Interfaces. 2016 Oct 19;8(41):28225-28230. doi: 10.1021/acsami.6b10264. Epub 2016 Oct 7.
By doping ZnO with porphyrin small molecules (FNEZnP-OE and FNEZnP-T) as cathode electron transport layers (ETLs), the inverted polymer solar cells (i-PSC) with PTB7:PCBM (PTB7: polythieno[3,4-b]-thiophene-co-benzodithiophene, PCBM:[6, 6]-phenyl-C-butyric acid methyl ester) as the active materials exhibit enhanced device performance. While the power conversion efficiency (PCE) of the PSCs with pure ZnO ETL is 7.52%, that of the devices with FNEZnP-T-doped ZnO ETL shows a slightly improved PCE of 8.09%, and that of the PSCs with FNEZnP-OE-doped ZnO ETL is further enhanced up to 9.24% with an over 20% improvement compared to that with pure ZnO ETL. The better performance is contributed by the better interfacial contact and reduced work function induced by 9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorenes and 3,4-bis(2-(2-methoxy-ethoxy)-ethoxy)-phenyls in the porphyrin small molecules. More importantly, the PCE is still higher than 8% even when the thickness of FNEZnP-OE-doped ZnO ETL is up to 110 nm, which are important criteria for eventually making organic photovoltaic modules with roll-to-roll coat processing.
通过将卟啉小分子（FNEZnP - OE和FNEZnP - T）掺杂到ZnO中作为阴极电子传输层（ETL），以PTB7:PCBM（PTB7：聚噻吩并[3,4 - b]噻吩 - 共 - 苯并二噻吩，PCBM：[6,6] - 苯基 - C - 丁酸甲酯）作为活性材料的倒置聚合物太阳能电池（i - PSC）展现出增强的器件性能。纯ZnO ETL的PSC的功率转换效率（PCE）为7.52%，而具有FNEZnP - T掺杂ZnO ETL的器件的PCE略有提高，为8.09%，具有FNEZnP - OE掺杂ZnO ETL的PSC的PCE进一步提高到9.24%，与纯ZnO ETL相比提高了20%以上。更好的性能得益于卟啉小分子中9,9 - 双（30 - （N，N - 二甲基氨基）丙基） - 2,7 - 芴和3,4 - 双（2 - （2 - 甲氧基 - 乙氧基） - 乙氧基） - 苯基所诱导的更好的界面接触和降低的功函数。更重要的是，即使FNEZnP - OE掺杂ZnO ETL的厚度高达110 nm时，PCE仍高于8%，这对于最终采用卷对卷涂层工艺制造有机光伏组件来说是重要标准。
