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-OMeTAD)、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-assembled monolayers,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,己成为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.
Research Progress of Self-assembled Hole-transporting Monolayers in Inverted Perovskite Solar Cells
Hole transport layer plays an important role in extracting and transporting photogenerated holes from the perov-skite layer and suppressing back electron in Perovskite solar cell(PSC).It is an important component of high-performance devices.Classic hole transport materials,such as 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene(spi-ro-OMeTAD),poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA),etc.,have high prices and low hole mobility,which limit the large-scale application.In recent years,self-assembled monolayers(SAM)have been widely used as hole transport layers in inverted PSC to improve device performance.SAM molecular structure contains anchoring functional groups,which can form a single molecule film on the substrate.It has the advantages of low material consumption,no need for additives,low parasitic absorption,compatibility with tandem devices,and is conducive to large-scale manufacturing.It has become a research hotspot in the field of perovskite solar cells.In the light of the development of PSC,this review classifies and sum-marizes the recent studies on SAM-based hole transport layers according to the different anchoring groups in the SAM mo-lecular structure,and analyzes the effects of the molecular structure changes on the molecular properties and device per-formance.Finally,the development of SAM as a hole transport layer is summarized and prospected.
perovskite solar cellhole transporting materialsself-assembled monolayersphotoelectric conversion efficien-cystability
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