Lim Jihyun, Kim Min-Sung, Jang Woongsik, Park Jin Kuen, Wang Dong Hwan
School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjack-gu, Seoul, 06974, Republic of Korea.
Department of Chemistry, Hankuk University of Foreign Studies, Yongin, 17035, Gyeonggi-do, Republic of Korea.
ChemSusChem. 2021 Dec 6;14(23):5167-5178. doi: 10.1002/cssc.202101785. Epub 2021 Sep 28.
Polyvinyl carbazole (P0)-based pendant polymers were synthesized by modifying carbazole motifs with pyrene derivatives (P1 and P4) to manipulate the bandgap and frontier orbital energy levels. To establish the electronic properties of pendant polymers according to structural differences, the polymers were utilized as additional hole transport layers in planar-type perovskite solar cells and organic photovoltaic cells. When P4 with thiophene-pyrene pendant was used as hole transport layer, all device parameters, except open-circuit voltage, were significantly improved in comparison with P0 and P1 (conjugated with t-butyl pyrene derivatives). Since P4 had more electrically conductive thiophene units than benzene units with fewer alkyl groups, the supramolecular assembly of P4 was found to be more favorable in electronic devices. Furthermore, devices with P4 demonstrated lower dark current than others, which could potentially be useful for charge carrier transport and sensitive photo detecting devices.
通过用芘衍生物（P1和P4）修饰咔唑基序来合成基于聚乙烯基咔唑（P0）的侧基聚合物，以调控带隙和前沿轨道能级。为了根据结构差异确定侧基聚合物的电子性质，将这些聚合物用作平面型钙钛矿太阳能电池和有机光伏电池中的附加空穴传输层。当使用带有噻吩 - 芘侧基的P4作为空穴传输层时，与P0和P1（与叔丁基芘衍生物共轭）相比，除开路电压外的所有器件参数均得到显著改善。由于P4具有比苯单元更多的导电噻吩单元且烷基较少，发现P4的超分子组装在电子器件中更有利。此外，具有P4的器件表现出比其他器件更低的暗电流，这对于电荷载流子传输和灵敏的光检测器件可能具有潜在用途。
