A Multifunctional Molecular Bridging Layer for High Efficiency, Hysteresis-Free, and Stable Perovskite Solar Cells


Yin, Li, Ding, Changzeng, Liu, Chenguang, Zhao, Chun, Zha, Wusong, Mitrovic, Ivona Z ORCID: 0000-0003-4816-8905, Lim, Eng Gee, Han, Yunfei, Gao, Xiaomei, Zhang, Lianping et al (show 7 more authors) (2023) A Multifunctional Molecular Bridging Layer for High Efficiency, Hysteresis-Free, and Stable Perovskite Solar Cells. ADVANCED ENERGY MATERIALS, 13 (25).

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Abstract

<jats:title>Abstract</jats:title><jats:p>At present, the dominating electron transport material (ETL) and hole transport material (HTL) used in the state‐of‐the‐art perovskite solar cells (PSCs) are tin oxide and 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenyl‐amine)‐9,9′‐spirobifluorene (Spiro‐OMeTAD). However, the surface hydroxyl groups of the SnO<jats:sub>2</jats:sub> layer and the Li<jats:sup>+</jats:sup> ions within the Spiro‐OMeTAD HTL layer generally cause surface charge recombination and Li<jats:sup>+</jats:sup> migration, significantly reducing the devices' performance and stability. Here, a molecule bridging layer of 3,5‐bis(fluorosulfonyl)benzoic acid (FBA) is introduced onto the SnO<jats:sub>2</jats:sub> surface, which provides appropriate surface energy, reduces interfacial traps, forms a better energy level alignment, and, most importantly, anchors (immobilizes) Li<jats:sup>+</jats:sup> ions in the ETL, and consequently improves the device power conversion efficiency (PCE) up to 24.26% without hysteresis. Moreover, the device with the FBA passivation layer shows excellent moisture and operational stability, maintaining over 80% of the initial PCE after 1000 h under both aging conditions. The current work provides a comprehensive understanding of the influence of the extrinsic Li<jats:sup>+</jats:sup> ion migration within the cell on the device's performance and stability, which helps design and fabricate high‐performance and hysteresis‐free PSCs.</jats:p>

Item Type: Article
Uncontrolled Keywords: high moisture and operation stability, hysteresis-free, Li+ ion migration, multifunctional molecular bridging layers
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Sep 2023 07:28
Last Modified: 19 Sep 2023 07:28
DOI: 10.1002/aenm.202301161
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3172871
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