Engineering of dendritic dopant-free hole transport molecules: enabling ultrahigh fill factor in perovskite solar cells with optimized dendron construction
Woo, Han Young
Djurišić, Aleksandra B.
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Material Science and Engineering Program
KAUST Solar Center (KSC)
Online Publication Date2020-10-15
Print Publication Date2021-01
Embargo End Date2021-10-17
Permanent link to this recordhttp://hdl.handle.net/10754/665712
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AbstractDeveloping 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.
CitationChen, W., Wang, Y., Liu, B., Gao, Y., Wu, Z., Shi, Y., … He, Z. (2020). Engineering of dendritic dopant-free hole transport molecules: enabling ultrahigh fill factor in perovskite solar cells with optimized dendron construction. Science China Chemistry. doi:10.1007/s11426-020-9857-1
SponsorsThis work was supported by the National Natural Science Foundation of China (21805128, 21774055, 61775091), Shenzhen Key Laboratory Project (ZDSYS201602261933302), Shenzhen Innovation Committee (JCYJ20180504165851864), Shenzhen Innovation Committee (JCYJ20170818141216288), and the Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong. We are grateful to the assistance of SUSTech Core Research Facilities.
JournalScience China Chemistry