Yu Yang-Yen, Chen Hung-Cheng, Shih Kai-Yu, Peng Yan-Cheng, Jiang Bing-Huang, Liu Chao-I, Hsu Ming-Wei, Kuo Chi-Ching, Chen Chih-Ping
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung 81148, Taiwan.
Polymers (Basel). 2022 Oct 21;14(20):4466. doi: 10.3390/polym14204466.
In this study, we prepared three benzo[]perylenetriimide (BPTI) conjugated molecules as electron-transporting surface-modifying layers for polymer solar cells (PSCs). These three BPTI derivatives differed in the nature of their terminal functionalities, featuring butylamine (CNH), propylammonium iodide (CNHI), and butyldimethylamine (CDMA) units, respectively. We evaluated the optoelectronic properties of PTB7-Th: PCBM blends modified with these interfacial layers, as well as the performance of resulting PSCs. We used UV-Vis spectroscopy, atomic force microscopy, surface energy analysis, ultraviolet photoelectron spectroscopy, and photoelectric flow measurements to examine the phenomena behind the changes in the optoelectronic behavior of these blend films. The presence of a BPTI derivative changed the energy band alignment at the ZnO-active layer interface, leading to the ZnO film behaving more efficiently as an electron-extraction electrode. Modifying the ZnO surface with the BPTI-CNHI derivative resulted in a best power conversion efficiency (PCE) of 10.2 ± 0.53% for the PTB7-Th:PCBM PSC (cf. PCE of the control device of 9.1 ± 0.13%). In addition, modification of a PM6:Y6:PCBM PSC with the BPTI-CNHI derivative increased its PCE from 15.6 ± 0.25% to 16.5 ± 0.18%. Thus, BPTI derivatives appear to have potential as IFLs when developing high-performance PSCs, and might also be applicable in other optoelectronic devices.
在本研究中，我们制备了三种苯并[ ]苝四酰亚胺（BPTI）共轭分子，作为聚合物太阳能电池（PSC）的电子传输表面改性层。这三种BPTI衍生物的末端官能团性质不同，分别具有丁胺（CNH）、丙基碘化铵（CNHI）和丁基二甲基胺（CDMA）单元。我们评估了用这些界面层改性的PTB7-Th:PCBM共混物的光电性能，以及由此产生的PSC的性能。我们使用紫外-可见光谱、原子力显微镜、表面能分析、紫外光电子能谱和光电流测量来研究这些共混膜光电行为变化背后的现象。BPTI衍生物的存在改变了ZnO-活性层界面处的能带排列，使得ZnO膜作为电子提取电极的效率更高。用BPTI-CNHI衍生物对ZnO表面进行改性后，PTB7-Th:PCBM PSC的最佳功率转换效率（PCE）为10.2±0.53%（对照器件的PCE为9.1±0.13%）。此外，用BPTI-CNHI衍生物对PM6:Y6:PCBM PSC进行改性，其PCE从15.6±0.25%提高到了16.5±0.18%。因此，BPTI衍生物在开发高性能PSC时似乎具有作为界面层（IFL）的潜力，并且也可能适用于其他光电器件。
