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Reducing Interfacial Recombination in Inverted Perovskite Solar Cells With Selenophene-Substituted PCBM: Comparison
Andrea Cabrera-Espinoza1, José G Sánchez2, Wenhui Li2
1POLYMAT, University of the Basque Country (UPV/EHU), Avenida Tolosa 72, 20018, Donostia/San Sebastián, Spain.
Chemsuschem
|October 16, 2024
Summary
This study introduces selenophene substitution in phenyl-butyric acid methyl ester (PCBM) to boost perovskite solar cell (PSC) performance. Selenophene-modified PCBM enhances charge transfer and reduces recombination, improving PSC efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) require efficient charge transport layers (CTLs) to minimize interfacial recombination and enhance performance.
- Phenyl-butyric acid methyl ester (PCBM) is a common CTL material, but its efficiency can be limited by charge transfer and recombination issues.
Purpose of the Study:
- To investigate the impact of selenophene substitution in PCBM on the performance and stability of inverted PSCs.
- To compare selenophene-based PCBM with thiophene and furan substituted analogs, as well as unsubstituted PCBM.
- To explore the influence of fullerene cages (C70 vs. C60) within the PCBM structure on device characteristics.
Main Methods:
- Synthesis and characterization of PCBM derivatives with selenophene, thiophene, and furan substitutions.
- Fabrication and testing of inverted PSCs utilizing these modified PCBM electron transport layers (ETLs).
- Photovoltaic performance analysis, including efficiency, charge mobility, and recombination studies.
Main Results:
- Selenophene substitution in PCBM significantly enhances photovoltaic parameters of PSCs, attributed to reduced trap-assisted recombination and increased electron mobility.
- Optimized thickness of the selenophene-based ETL leads to improved charge extraction processes and overall device performance.
- Utilizing C70 fullerene cages in PCBM facilitates systematic analysis by allowing comparable ETL thicknesses, isolating the electronic effects of the chalcogenophene moiety.
Conclusions:
- Selenophene-modified PCBM is a promising strategy for developing high-performance and stable PSCs.
- The electronic properties introduced by selenophene substitution are key to overcoming limitations in charge transport and recombination.
- The choice of fullerene cage (C70 vs. C60) impacts device fabrication and analysis, with C70 offering advantages for systematic electronic property studies.
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