Poly(hydroxymethylated-3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT-MeOH:PSS) conducting polymers are synthesized and incorporated in inverted structured perovskite solar cells (PVSCs) as hole transport materials. The highest occupied molecular orbital of PEDOT-MeOH is lowered by adding a hydroxymethyl (−MeOH) functional group to ethylenedioxythiophene (EDOT), and thus, the work function of PEDOT-MeOH:PSS is increased. Additionally, hydrogen bonding can be formed among EDOT-MeOH monomers and between EDOT-MeOH monomers and sulfate groups on PSS, which promotes PEDOT-MeOH chain growth and enhances PSS doping. The electronic, microstructural, and surface morphological properties of PEDOT-MeOH:PSS are modified by changing the amounts of PSS and the ferric oxidizing agent used in the polymerization and by adding ethylene glycol in the postsynthesis treatment. The PVSCs based on ethylene-glycol-treated PEDOT-MeOH:PSS overperform the PVSCs based on commercial PEDOT:PSS because of the better energetic alignment and the enhancement of PEDOT-MeOH:PSS electrical conductivity. This work opens the way to develop new hole transport materials for highly efficient inverted PVSCs.

中文翻译：

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用于钙钛矿太阳能电池的羟甲基官能化PEDOT-MeOH：PSS

合成了聚（羟甲基化3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT-MeOH：PSS）导电聚合物，并将其作为空穴传输材料掺入倒置的钙钛矿型太阳能电池（PVSC）中。通过在乙二氧基噻吩（EDOT）中添加羟甲基（-MeOH）官能团，可以降低PEDOT-MeOH的最高占据分子轨道，从而提高PEDOT-MeOH：PSS的功函。此外，可以在EDOT-MeOH单体之间以及EDOT-MeOH单体与PSS上的硫酸根之间形成氢键，从而促进PEDOT-MeOH链的生长并增强PSS掺杂。PEDOT-MeOH的电子，微观结构和表面形态特性：通过改变聚合反应中使用的PSS和铁氧化剂的量以及在合成后处理中添加乙二醇，可以对PSS进行改性。基于乙二醇处理的PEDOT-MeOH：PSS的PVSC优于基于商业PEDOT：PSS的PVSC，因为它的能量排列更好，并且PEDOT-MeOH：PSS的电导率增强。这项工作为开发用于高效反向PVSC的新型空穴传输材料开辟了道路。