Strengthening Durability of Electron Selective Layer and Interface via Trifluoromethoxy-Functionalized Biguanide Cation Toward High-performance Air-Processed n-i-p Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 41185466.
- Also identified by DOI 10.1002/adma.202518388.
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Abstract
The poor stability of the electron-selective layer (ESL) and buried interface hampers the realization of long-term operationally stable air-processed n-i-p perovskite solar cells (PSCs). Herein, ESL and the buried interface are stabilized through a trifluoromethoxy-functionalized biguanide cation strategy. The multisite 1-[4-(trifluoromethoxy) phenyl] biguanide hydrochloride (TOPBCl) is pre-embedded in SnO<sub>2</sub> nanoparticles to fulfil simultaneous manipulation of both ESL and buried interface. The rich chemical bonds are formed at the buried interface by the synergy of trifluoromethoxy and biguanide cation, accomplishing a chemical bridge between ESL and perovskite layer, which enables dropped interface defects, facilitates perovskite crystallization, and ameliorates energy band alignment. Owing to saliently suppressed interfacial non-radiative recombination, the TOPBCl-modified PSCs achieve an excellent power conversion efficiency (PCE) of 25.79%, which is one of the highest efficiencies reported for air-processed PSCs. Benefiting from reinforced longevity of ESL and buried interface, the unencapsulated TOPBCl-modulated devices demonstrate superior operational stability, maintaining 90.04% of their initial PCE after 927 h of continuous maximum power point tracking at 40 ± 5°C. This study provides a biguanide cation functionalization strategy to synchronously stabilize ESL and interface for realizing high-performance air-processed PSCs.