Fan Ruiting, Song Li, Hu Yongsheng, Guo Xiaoyang, Liu Xingyuan, Wang Lishuang, Geng Chong, Xu Shu, Zhang Yonghui, Zhang Zihui, Luan Nannan, Bi Wengang
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, 5340 Xiping Road, Tianjin 300401, P. R. China.
Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, 5340 Xiping Road, Tianjin 300401, P. R. China.
ACS Appl Mater Interfaces. 2020 Sep 23;12(38):43331-43338. doi: 10.1021/acsami.0c13214. Epub 2020 Sep 10.
Properties of the underlying hole transport layer (HTL) in perovskite light-emitting devices (PeLEDs) play a critical role in determining the optoelectronic performance through influencing both the charge transport and the quality of the active perovskite emission layer (EML). This work focuses on manipulating the carrier transport behavior and obtaining a high-quality EML film by tailoring the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) HTL with previously unused amino alcohol 3-amino-1-propanol (3AP). The modified PEDOT:PSS rendered a deeper work function that is more suitable for the hole injection from the HTL to EML. More importantly, the 3AP-modified PEDOT:PSS film can induce a low-dimensional perovskite phase that can passivate the defects in the EML, resulting in a significantly improved light emission. Such ameliorations consequently result in a dramatical enhancement in performance of PeLED with a low turn-on voltage of 2.54 V, a maximum luminance of 23033 cd/m, a highest current efficiency of 29.38 cd/A, a corresponding maximum external quantum efficiency of 9.4%, and a prolonged lifetime of 6.1 h at a proper Cs/Pb ratio.
钙钛矿发光器件（PeLEDs）中底层空穴传输层（HTL）的性质，通过影响电荷传输和活性钙钛矿发光层（EML）的质量，在决定光电器件性能方面起着关键作用。这项工作聚焦于通过用此前未使用过的氨基醇3-氨基-1-丙醇（3AP）对聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）空穴传输层进行定制，来操控载流子传输行为并获得高质量的EML薄膜。改性后的PEDOT:PSS具有更深的功函数，更适合空穴从空穴传输层注入到发光层。更重要的是，3AP改性的PEDOT:PSS薄膜能够诱导出低维钙钛矿相，该相可以钝化发光层中的缺陷，从而显著改善发光效果。这些改进最终使得PeLED的性能得到显著提升，开启电压低至2.54 V，最大亮度为23033 cd/m²，最高电流效率为29.38 cd/A，相应的最大外量子效率为9.4%，并且在合适的铯/铅比例下寿命延长至6.1小时。
