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Bifacial Passivation of Organic Hole Transport Interlayer for NiOx-Based p-i-n Perovskite Solar Cells

Title
Bifacial Passivation of Organic Hole Transport Interlayer for NiOx-Based p-i-n Perovskite Solar Cells
Author
박희준
Keywords
defect passivation; hole transport materials; perovskite solar cells; UV durability
Issue Date
2019-03
Publisher
WILEY
Citation
ADVANCED SCIENCE , v.6 , NO.6 , no. 1802163
Abstract
Methoxy-functionalized triphenylamine-imidazole derivatives that can simultaneously work as hole transport materials (HTMs) and interface-modifiers are designed for high-performance and stable perovskite solar cells (PSCs). Satisfying the fundamental electrical and optical properties as HTMs of p-i-n planar PSCs, their energy levels can be further tuned by the number of methoxy units for better alignment with those of perovskite, leading to efficient hole extraction. Moreover, when they are introduced between perovskite photoabsorber and low-temperature solution-processed NiOx interlayer, widely featured as an inorganic HTM but known to be vulnerable to interfacial defect generation and poor contact formation with perovskite, nitrogen and oxygen atoms in those organic molecules are found to work as Lewis bases that can passivate undercoordinated ion-induced defects in the perovskite and NiOx layers inducing carrier recombination, and the improved interfaces are also beneficial to enhance the crystallinity of perovskite. The formation of Lewis adducts is directly observed by IR, Raman, and X-ray photoelectron spectroscopy, and improved charge extraction and reduced recombination kinetics are confirmed by time-resolved photoluminescence and transient photovoltage experiments. Moreover, UV-blocking ability of the organic HTMs, the ameliorated interfacial property, and the improved crystallinity of perovskite significantly enhance the stability of PSCs under constant UV illumination in air without encapsulation.
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/advs.201802163http://repository.hanyang.ac.kr/handle/20.500.11754/109919
ISSN
2198-3844
DOI
10.1002/advs.201802163
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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