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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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High-Performance Inverted Perovskite Solar Cells with Operational Stability via n-Type Small Molecule Additive-Assisted Defect Passivation

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Title
High-Performance Inverted Perovskite Solar Cells with Operational Stability via n-Type Small Molecule Additive-Assisted Defect Passivation
Author
Koo, DonghwanCho, YongjoonKim, UngsooJeong, GyujeongLee, JunghyunSeo, JihyungYang, ChangdukPark, Hyesung
Issue Date
2020-10
Publisher
Wiley-VCH Verlag
Citation
Advanced Energy Materials
Abstract
Significant efforts have been devoted to modulating the grain size and improving the film quality of perovskite in perovskite solar cells (PSCs). Adding materials to the perovskite is especially promising for high-performance PSCs, because the additives effectively control the crystal structure. Although the additive engineering approach has substantially boosted the efficiency of PSCs, instability of the perovskite film has remained a primary bottleneck for the commercialization of PSCs. Herein, a newly conceived bithiophene-based n-type conjugated small molecule (Y-Th2) is introduced to PSCs, which simultaneously enhances the performance and stability of the cell. The Y-Th2 effectively passivates the defect states in perovskite through Lewis acid–base interactions, increasing the grain size and quality of the perovskite absorber. An inverted PSC containing the Y-Th2 additive achieves a power conversion efficiency of 21.5%, versus 18.3% in the reference device. The operational stability is also considerably enhanced by the improved hydrophobicity and intermolecular hydrogen bonds in the perovskite. © 2020 Wiley-VCH GmbH
URI
https://scholarworks.unist.ac.kr/handle/201301/48771
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.202001920
DOI
10.1002/aenm.202001920
ISSN
1614-6832
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