A series of spiro-type hole transporting materials, spiro-OMe TAD, spiro-SMe TAD and spiro-OSMe TAD,with methoxy, methylsulfanyl or half methoxy and half methylsulfanyl terminal groups are designed and prepared. The i...A series of spiro-type hole transporting materials, spiro-OMe TAD, spiro-SMe TAD and spiro-OSMe TAD,with methoxy, methylsulfanyl or half methoxy and half methylsulfanyl terminal groups are designed and prepared. The impact of varied terminal groups on bulk properties, such as photophysical, electrochemical, thermal, hole extraction, and photovoltaic performance in perovskite solar cells is investigated.It is noted that the terminal groups of the hole transporting material with half methoxy and half methylsulfanyl exhibit a better device performance and decreased hysteresis compared with all methoxy or methylsulfanyl counterparts due to better film-forming ability and improved hole extraction capability.Promisingly, the spiro-OSMe TAD also shows comparable performance than high-purity commercial spiro-OMe TAD. Moreover, the highest power conversion efficiency of the optimized device employing spiro-OSMe TAD exceeding 20% has been achieved.展开更多
空穴传输层在钙钛矿太阳电池(Perovskite solar cell, PSC)中起着抽取和传输钙钛矿层产生的光生空穴、抑制电子回流等重要作用,是构成高性能器件的重要组成部分.经典的空穴传输材料,如2,2',7,7'-四[N,N-二(4-甲氧基苯基)氨基]-9...空穴传输层在钙钛矿太阳电池(Perovskite solar cell, PSC)中起着抽取和传输钙钛矿层产生的光生空穴、抑制电子回流等重要作用,是构成高性能器件的重要组成部分.经典的空穴传输材料,如2,2',7,7'-四[N,N-二(4-甲氧基苯基)氨基]-9,9'-螺二芴(spiro-OMe TAD)、聚[双(4-苯基)(2,4,6-三甲基苯基)胺](PTAA)等,空穴迁移率低、价格昂贵等缺点限制了其规模化应用.近年来,在反式PSC中自组装单分子层(self-assembledmonolayers,SAM)作为空穴传输层广泛应用,提升了器件性能.SAM分子结构中含有锚定官能团,可以在衬底上形成单分子薄膜,有着材料消耗小、无需添加剂、寄生吸收低、能够兼容叠层器件和有利于大面积制造等优点,已成为PSC领域的研究热点.本综述结合PSC发展,按照SAM分子结构中锚定基团的不同,对近年来基于SAM的空穴传输层的研究进行了分类和归纳,结合分子骨架变化分析了结构变化对其特性及器件性能的影响.最后,对SAM作为空穴传输层的发展做了总结和展望.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2020YFB1506400)the National Natural Science Foundation of China(Grant Nos.61904053,51702096,U1705256,51961165106)the Fundamental Research Funds for the Central Universities(Grant Nos.2019MS026,2019MS027,2020MS080)。
文摘A series of spiro-type hole transporting materials, spiro-OMe TAD, spiro-SMe TAD and spiro-OSMe TAD,with methoxy, methylsulfanyl or half methoxy and half methylsulfanyl terminal groups are designed and prepared. The impact of varied terminal groups on bulk properties, such as photophysical, electrochemical, thermal, hole extraction, and photovoltaic performance in perovskite solar cells is investigated.It is noted that the terminal groups of the hole transporting material with half methoxy and half methylsulfanyl exhibit a better device performance and decreased hysteresis compared with all methoxy or methylsulfanyl counterparts due to better film-forming ability and improved hole extraction capability.Promisingly, the spiro-OSMe TAD also shows comparable performance than high-purity commercial spiro-OMe TAD. Moreover, the highest power conversion efficiency of the optimized device employing spiro-OSMe TAD exceeding 20% has been achieved.
文摘空穴传输层在钙钛矿太阳电池(Perovskite solar cell, PSC)中起着抽取和传输钙钛矿层产生的光生空穴、抑制电子回流等重要作用,是构成高性能器件的重要组成部分.经典的空穴传输材料,如2,2',7,7'-四[N,N-二(4-甲氧基苯基)氨基]-9,9'-螺二芴(spiro-OMe TAD)、聚[双(4-苯基)(2,4,6-三甲基苯基)胺](PTAA)等,空穴迁移率低、价格昂贵等缺点限制了其规模化应用.近年来,在反式PSC中自组装单分子层(self-assembledmonolayers,SAM)作为空穴传输层广泛应用,提升了器件性能.SAM分子结构中含有锚定官能团,可以在衬底上形成单分子薄膜,有着材料消耗小、无需添加剂、寄生吸收低、能够兼容叠层器件和有利于大面积制造等优点,已成为PSC领域的研究热点.本综述结合PSC发展,按照SAM分子结构中锚定基团的不同,对近年来基于SAM的空穴传输层的研究进行了分类和归纳,结合分子骨架变化分析了结构变化对其特性及器件性能的影响.最后,对SAM作为空穴传输层的发展做了总结和展望.
