Fan Dongyu, Zhang Ren, Li Yuheng, Shan Chengwei, Li Wenhui, Wang Yunhao, Xu Feiyang, Fan Hua, Sun Zonghao, Li Xuehui, Zhao Mengshuai, Kyaw Aung Ko Ko, Li Gongqiang, Wang Jianpu, Huang Wei
Key Laboratory of Flexible Electronic (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing, China.
Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting, and Department of Electrical & Electronic Engineering Southern University of Science and Technology, Shenzhen, China.
Front Chem. 2021 Oct 25;9:746365. doi: 10.3389/fchem.2021.746365. eCollection 2021.
A new dopant-free hole transporting material (HTM) 4',4‴,4‴'',4‴''''-(adamantane-1,3,5,7-tetrayl)tetrakis(N,N-bis(4-methoxyphenyl)-[1,1'-biphenyl]-4-amine) (Ad-Ph-OMeTAD) (named FDY for short), which consists of a nonconjugated 3D bulky caged adamantane (Ad) as the core, triphenyl amines as side arms, and phenyl units as a linking bridge, is synthesized and applied in an inverted planar perovskite solar cell (PSC). As a result, the champion device with FDY as HTM yields an impressive power of conversion efficiency (PCE) of 18.69%, with J = 22.42 mA cm, V = 1.05 V, and FF = 79.31% under standard AM 1.5G illumination, which is ca. 20% higher than that of the device based on PEDOT:PSS (only 15.41%). Notably, the stability of PSC based on FDY is much better than that of devices based on PEDOT:PSS, and the corresponding devices retain over 90% of their initial PCEs after storing for 60 days in a nitrogen glove box without any encapsulation. Even when stored in an open air condition with 50-60% relative humidity for 188 h, the retained PCE is still over 81% of its initial one. All these results demonstrate that the new design strategy by combing the bulky and nonconjugated (aliphatic) adamantane unit as the core and triphenyl amines as side arms can efficiently develop highly efficient HTMs for PSCs, which is different from the traditional way based on conjugated backbones, and it may open a new way for scientists to design small-molecule HTMs for PSCs.
一种新型无掺杂空穴传输材料4',4‴,4‴'',4‴''''-(金刚烷-1,3,5,7-四亚基)四(N,N-双(4-甲氧基苯基)-[1,1'-联苯]-4-胺)(简称FDY)被合成并应用于倒置平面钙钛矿太阳能电池(PSC)中。该材料以非共轭的三维大体积笼状金刚烷(Ad)为核心，三苯胺为侧链，苯基单元为连接桥。结果表明，以FDY为空穴传输材料的冠军器件在标准AM 1.5G光照下，实现了令人印象深刻的18.69%的功率转换效率(PCE)，其中J = 22.42 mA cm，V = 1.05 V，填充因子(FF) = 79.31%，比基于聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)的器件(仅15.41%)高出约20%。值得注意的是，基于FDY的PSC的稳定性远优于基于PEDOT:PSS的器件，相应器件在氮气手套箱中储存60天且无任何封装后，仍保留其初始PCE的90%以上。即使在相对湿度为50% - 60%的开放空气中储存188小时，保留的PCE仍超过其初始值的81%。所有这些结果表明，将大体积非共轭(脂肪族)金刚烷单元作为核心与三苯胺作为侧链相结合的新设计策略能够有效地开发出用于PSC的高效空穴传输材料，这与基于共轭主链的传统方法不同，可能为科学家设计用于PSC的小分子空穴传输材料开辟一条新途径。
