TY - JOUR
T1 - Tailoring Ionic Liquid Chemical Structure for Enhanced Interfacial Engineering in Two-Step Perovskite Photovoltaics
AU - Wang, Fei
AU - Ma, Jing
AU - Duan, Dawei
AU - Liang, Xiao
AU - Zhou, Kang
AU - Sun, Yonggui
AU - Wang, Taomiao
AU - Yang, Guo
AU - Pei, Guoxian
AU - Lin, Haoran
AU - Shi, Yumeng
AU - Zhu, Quanyao
AU - Li, Gang
AU - Hu, Hanlin
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/12
Y1 - 2023/12
N2 - Ionic liquids (ILs) have emerged as versatile tools for interfacial engineering in perovskite photovoltaics. Their multifaceted application targets defect mitigation at SnO2-perovskite interfaces, finely tuning energy level alignment, and enhancing charge transport, meanwhile suppressing non-radiative recombination. However, the diverse chemical structures of ILs present challenges in selecting suitable candidates for effective interfacial modification. This study adopted a systematic approach, manipulating IL chemical structures. Three ILs with distinct anions are introduced to modify perovskite/SnO2 interfaces to elevate the photovoltaic capabilities of perovskite devices. Specifically, ILs with different anions exhibited varied chemical interactions, leading to notable passivation effects, as confirmed by Density Functional Theory (DFT) calculation. A detailed analysis is also conducted on the relationship between the ILs' structure and regulation of energy level arrangement, work function, perovskite crystallization, interface stress, charge transfer, and device performance. By optimizing IL chemical structures and exploiting their multifunctional interface modification properties, the champion device achieved a PCE of 24.52% with attentional long-term stability. The study establishes a holistic link between IL structures and device performance, thereby promoting wider application of ILs in perovskite-based technologies.
AB - Ionic liquids (ILs) have emerged as versatile tools for interfacial engineering in perovskite photovoltaics. Their multifaceted application targets defect mitigation at SnO2-perovskite interfaces, finely tuning energy level alignment, and enhancing charge transport, meanwhile suppressing non-radiative recombination. However, the diverse chemical structures of ILs present challenges in selecting suitable candidates for effective interfacial modification. This study adopted a systematic approach, manipulating IL chemical structures. Three ILs with distinct anions are introduced to modify perovskite/SnO2 interfaces to elevate the photovoltaic capabilities of perovskite devices. Specifically, ILs with different anions exhibited varied chemical interactions, leading to notable passivation effects, as confirmed by Density Functional Theory (DFT) calculation. A detailed analysis is also conducted on the relationship between the ILs' structure and regulation of energy level arrangement, work function, perovskite crystallization, interface stress, charge transfer, and device performance. By optimizing IL chemical structures and exploiting their multifunctional interface modification properties, the champion device achieved a PCE of 24.52% with attentional long-term stability. The study establishes a holistic link between IL structures and device performance, thereby promoting wider application of ILs in perovskite-based technologies.
KW - chemical structure
KW - interface engineering
KW - ionic liquid
KW - perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85178921084&partnerID=8YFLogxK
U2 - 10.1002/smll.202307679
DO - 10.1002/smll.202307679
M3 - Journal article
AN - SCOPUS:85178921084
SN - 1613-6810
JO - Small
JF - Small
M1 - 2307679
ER -