天津大学李祥高团队通过氟化钝化剂与空穴传输掺杂剂的协同作用使钙钛矿型太阳能电池的效率接近24%。相关研究成果发表在2021年2月18日出版的《美国化学会杂志》。

钙钛矿型太阳能电池（PSCs）的长期耐久性对其商业化至关重要。钙钛矿的离子特性和空穴传输层（HTL）常用添加剂的亲水性，如锂双（三氟甲磺酰）酰亚胺（Li-TFSI）和叔丁基吡啶（tBP），使得PSCs容易受潮，影响其长期稳定性。

该文中，研究人员开发了一种三氟甲基化策略来克服这一缺点，并提高PSC的太阳能电力转换效率（PCE）。研究人员采用4-（三氟甲基）苄基碘化铵（TFMBAI）作为两亲性改性剂来减少界面缺陷，4-（三氟甲基）吡啶（TFP）作为添加剂来增强HTL的疏水性。用TFMBAI对三元阳离子钙钛矿进行表面处理，在很大程度上抑制了非辐射电荷载流子复合，使PCE从20.9%提高到23.9%，并抑制了迟滞，同时在HTL中添加TFP，在保持较高PCE的同时提高了PCS的抗湿性。

利用这两种氟甲基化改性剂的协同效应，制备了TFMBAI/TFP基高效PSC，具有优异的操作稳定性和防潮性，在模拟1次太阳照射下，500小时最大功率点跟踪（MPPT）后，其初始效率保持在96%以上；在相对湿度为60–70%的环境条件下，1100小时暴露后，其初始效率保持在97%以上。

附：英文原文

Title: Synergistic Effect of Fluorinated Passivator and Hole Transport Dopant Enables Stable Perovskite Solar Cells with an Efficiency Near 24%

Author: Hongwei Zhu, Yameng Ren, Linfeng Pan, Olivier Ouellette, Felix T. Eickemeyer, Yinghui Wu, Xianggao Li, Shirong Wang, Hongli Liu, Xiaofei Dong, Shaik M. Zakeeruddin, Yuhang Liu, Anders Hagfeldt, Michael Grtzel

Issue&Volume: February 18, 2021

Abstract: Long-term durability is critically important for the commercialization of perovskite solar cells (PSCs). The ionic character of the perovskite and the hydrophilicity of commonly used additives for the hole-transporting layer (HTL), such as lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) and tert-butylpyridine (tBP), render PSCs prone to moisture attack, compromising their long-term stability. Here we introduce a trifluoromethylation strategy to overcome this drawback and to boost the PSC’s solar to electric power conversion efficiency (PCE). We employ 4-(trifluoromethyl)benzylammonium iodide (TFMBAI) as an amphiphilic modifier for interfacial defect mitigation and 4-(trifluoromethyl)pyridine (TFP) as an additive to enhance the HTL’s hydrophobicity. Surface treatment of the triple-cation perovskite with TFMBAI largely suppressed the nonradiative charge carrier recombination, boosting the PCE from 20.9% to 23.9% and suppressing hysteresis, while adding TFP to the HTL enhanced the PCS’s resistance to moisture while maintaining its high PCE. Taking advantage of the synergistic effects resulting from the combination of both fluoromethylated modifiers, we realize TFMBAI/TFP-based highly efficient PSCs with excellent operational stability and resistance to moisture, retaining over 96% of their initial efficiency after 500 h maximum power point tracking (MPPT) under simulated 1 sun irradiation and 97% of their initial efficiency after 1100 h of exposure under ambient conditions to a relative humidity of 60–70%.

DOI: 10.1021/jacs.0c12802

Source: https://pubs.acs.org/doi/10.1021/jacs.0c12802