Li Xianda, Tang Ailing, Guo Qing, Guo Xugang, Chen Jianhua, Guo Qiang, Ji Mengwei, Meng Yuhan, Li Xiangyu, Zhou Erjun
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, China.
CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
ACS Appl Mater Interfaces. 2022 Jul 20;14(28):32308-32318. doi: 10.1021/acsami.2c07251. Epub 2022 Jul 6.
As one of the polymer modification strategies, carboxylate functionalization has proved effective in downshifting the energy levels and enhancing polymer crystallinity and aggregation. However, high-performance carboxylate-containing polymers are still limited for organic solar cells (OSCs), especially with open-circuit voltage () above 1.0 V. Herein, we utilize two carboxylate-functionalized wide-band gap (WBG) donor polymers ( and ) to pair with two WBG electron acceptors ( and for high-voltage OSCs. Due to the deeper molecular energy levels, chlorinated polymer shows higher than fluorinated polymer . Furthermore, because of the stronger aggregation in the film, the -based devices attain suppressed energetic disorders and trap-assisted recombination, decreasing voltage loss and loss. Finally, the : blend achieves a higher of 1.17 V and an excellent PCE of 10.98%, one of the best results for high-voltage carboxylate-containing polymers. In addition, the : combination demonstrates the highest of 1.25 V with an ultralow nonradiative energy loss of 0.17 eV. Our results indicate that the carboxylate-containing polymer donors have significant application potential for high-voltage OSCs due to reduced energy loss and improved charge transport and dissociation. Furthermore, the matched absorption spectra with the indoor light sources and low voltage loss promote these material combinations to construct high-performance indoor photovoltaics.
作为聚合物改性策略之一，羧基官能化已被证明在降低能级、提高聚合物结晶度和聚集方面是有效的。然而，对于有机太阳能电池（OSC）而言，含羧基的高性能聚合物仍然有限，特别是开路电压（）高于1.0 V的情况。在此，我们利用两种羧基官能化的宽带隙（WBG）供体聚合物（和）与两种WBG电子受体（和）配对用于高压OSC。由于分子能级更深，氯化聚合物比氟化聚合物表现出更高的。此外，由于薄膜中更强的聚集，基于的器件实现了能量无序和陷阱辅助复合的抑制，降低了电压损失和损失。最后，: 共混物实现了1.17 V的更高以及10.98%的优异功率转换效率（PCE），这是含羧基高压聚合物的最佳结果之一。此外，: 组合展示了1.25 V的最高以及0.17 eV的超低非辐射能量损失。我们的结果表明，含羧基聚合物供体由于能量损失降低、电荷传输和解离改善，在高压OSC中具有显著的应用潜力。此外，与室内光源匹配的吸收光谱和低电压损失促使这些材料组合构建高性能室内光伏器件。
