Engineering of dendritic dopant-free hole transport molecules: enabling ultrahigh fill factor in perovskite solar cells with optimized dendron construction
- Authors
- Chen, Wei; Wang, Yang; Liu, Bin; Gao, Yajun; Wu, Ziang; Shi, Yongqiang; Tang, Yumin; Yang, Kun; Zhang, Yujie; Sun, Weipeng; Feng, Xiyuan; Laquai, Frederic; Woo, Han Young; Djurisic, Aleksandra B.; Guo, Xugang; He, Zhubing
- Issue Date
- 1월-2021
- Publisher
- SCIENCE PRESS
- Keywords
- dendritic molecules; hole-transporting materials; dopant-free; ultrahigh fill factor; perovskite solar cells
- Citation
- SCIENCE CHINA-CHEMISTRY, v.64, no.1, pp.41 - 51
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENCE CHINA-CHEMISTRY
- Volume
- 64
- Number
- 1
- Start Page
- 41
- End Page
- 51
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/50211
- DOI
- 10.1007/s11426-020-9857-1
- ISSN
- 1674-7291
- Abstract
- Developing dopant-free hole-transporting materials (HTMs) for high-performance perovskite solar cells (PVSCs) has been a very active research topic in recent years since HTMs play a critical role in optimizing interfacial charge carrier kinetics and in turn determining device performance. Here, a novel dendritic engineering strategy is first utilized to design HTMs with a D-A type molecular framework, and diphenylamine and/or carbazole is selected as the building block for constructing dendrons. All HTMs show good thermal stability and excellent film morphology, and the key optoelectronic properties could be fine-tuned by varying the dendron structure. Among them, MPA-Cz-BTI and MCz-Cz-BTI exhibit an improved interfacial contact with the perovskite active layer, and non-radiative recombination loss and charge transport loss can be effectively suppressed. Consequently, high power conversion efficiencies (PCEs) of 20.8% and 21.35% are achieved for MPA-Cz-BTI and MCz-Cz-BTI based devices, respectively, accompanied by excellent long-term storage stability. More encouragingly, ultrahigh fill factors of 85.2% and 83.5% are recorded for both devices, which are among the highest values reported to date. This work demonstrates the great potential of dendritic materials as a new type of dopant-free HTMs for high-performance PVSCs with excellent FF.
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