A novel strategy to improve the performance of fibre-shaped dye-sensitized solar cells (FDSSCs) has been successfully implemented using a polar polymer interlayer made of poly(2-ethyl-2-oxazoline) (PEOx). The inclusion of the PEOx interlayer reduces the typical defect sites and interband trap sites that exist on the TiO₂-nanotube-based photoanode of the FDSSC. A local built-in electric field, induced by the interfacial intrinsic polarity of the PEOx interlayer, promotes facile photogenerated charge injection/extraction kinetics at the TiO₂/dye interface. The negative polarity present on the bottom part of the PEOx chain exhibits an electronic doping-like behaviour, passivating the TiO₂ defect sites and reducing trap-assisted recombination, while the positive polarity present on the top part of the PEOx chain provides dye-rich anchoring sites to improve the N719 dye adsorption loading on the TiO₂ surface. The charge collection efficiency, short-circuit current density, open-circuit voltage, and fill factor of FDSSCs with the novel TiO₂@PEOx photoanodes are superior than those of FDSSCs with traditional TiO₂ photoanodes, by approximately 16.94%, 8.57%, 14.08%, and 6.58%, respectively. Consequently, the power conversion efficiency (PCE) of the proposed FDSSC is considerably improved, reaching 11.22%. Thus, the PCE of the proposed FDSSC is improved by approximately 32.16% compared with that of the traditional FDSSC.

中文翻译：

---

化学调谐的双功能极性中间层，用于纤维状染料敏化太阳能电池中的TiO2光阳极

使用由聚（2-乙基-2-恶唑啉）（PEOx）制成的极性聚合物中间层，已成功实施了一种提高纤维状染料敏化太阳能电池（FDSSCs）性能的新策略。PEOx夹层的包含减少了FDSSC的基于TiO ₂纳米管的光阳极上存在的典型缺陷位点和带间陷阱位点。由PEOx中间层的界面固有极性引起的局部内置电场可促进TiO ₂ /染料界面处的简便光生电荷注入/提取动力学。PEOx链底部存在的负极性表现出类似电子掺杂的行为，使TiO ₂钝化缺陷位点和减少陷阱辅助的重组，而PEOx链顶部的正极性提供了富染料的锚定位，以改善TiO ₂表面上N719染料的吸附量。带有新型TiO ₂ @PEOx光电阳极的FDSSC的电荷收集效率，短路电流密度，开路电压和填充系数比具有传统TiO ₂光电阳极的FDSSC的电荷收集效率，短路电流密度，开路电压和填充因子优越，分别约为具有传统TiO ₂光电阳极的FDSSC的16.94％，8.57％，14.08 ％和6.58％。因此，所提议的FDSSC的功率转换效率（PCE）大大提高，达到11.22％。因此，与传统的FDSSC相比，拟议的FDSSC的PCE提高了约32.16％。