Wang Yang, Liao Qiaogan, Chen Jianhua, Huang Wei, Zhuang Xinming, Tang Yumin, Li Bolin, Yao Xiyu, Feng Xiyuan, Zhang Xianhe, Su Mengyao, He Zhubing, Marks Tobin J, Facchetti Antonio, Guo Xugang
Department of Materials Science and Engineering, Southern University of Science and Technology (SUSTech), No. 1088, Xueyuan Road, Shenzhen, Guangdong 518055, China.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
J Am Chem Soc. 2020 Sep 30;142(39):16632-16643. doi: 10.1021/jacs.0c06373. Epub 2020 Sep 10.
As a key component in perovskite solar cells (PVSCs), hole-transporting materials (HTMs) have been extensively explored and studied. Aiming to meet the requirements for future commercialization of PVSCs, HTMs which can enable excellent device performance with low cost and eco-friendly processability are urgently needed but rarely reported. In this work, a traditional anchoring group (2-cyanoacrylic acid) widely used in molecules for dye-sensitized solar cells is incorporated into donor-acceptor-type HTMs to afford MPA-BT-CA, which enables effective regulation of the frontier molecular orbital energy levels, interfacial modification of an ITO electrode, efficient defect passivation toward the perovskite layer, and more importantly alcohol solubility. Consequently, inverted PVSCs with this low-cost HTM exhibit excellent device performance with a remarkable power conversion efficiency (PCE) of 21.24% and good long-term stability in ambient conditions. More encouragingly, when processing MPA-BT-CA films with the green solvent ethanol, the corresponding PVSCs also deliver a substantial PCE as high as 20.52% with negligible hysteresis. Such molecular design of anchoring group-based materials represents great progress for developing efficient HTMs which combine the advantages of low cost, eco-friendly processability, and high performance. We believe that such design strategy will pave a new path for the exploration of highly efficient HTMs applicable to commercialization of PVSCs.
作为钙钛矿太阳能电池（PVSCs）的关键组成部分，空穴传输材料（HTMs）已得到广泛探索和研究。为满足PVSCs未来商业化的要求，迫切需要能以低成本和环境友好的可加工性实现优异器件性能的HTMs，但相关报道很少。在这项工作中，一种广泛用于染料敏化太阳能电池分子中的传统锚定基团（2-氰基丙烯酸）被引入给体-受体型HTMs中，得到MPA-BT-CA，它能有效调节前沿分子轨道能级，对ITO电极进行界面修饰，对钙钛矿层进行高效缺陷钝化，更重要的是具有醇溶性。因此，采用这种低成本HTM的倒置PVSCs表现出优异的器件性能，具有21.24%的显著功率转换效率（PCE），并在环境条件下具有良好的长期稳定性。更令人鼓舞的是，当用绿色溶剂乙醇处理MPA-BT-CA薄膜时，相应的PVSCs也能提供高达20.52%的可观PCE，滞后现象可忽略不计。这种基于锚定基团材料的分子设计代表了在开发兼具低成本、环境友好可加工性和高性能优点的高效HTMs方面取得的巨大进展。我们相信，这种设计策略将为探索适用于PVSCs商业化的高效HTMs开辟一条新途径。
