Impact of 2D Ligands on Lattice Strain and Energy Losses in Narrow-Bandgap Lead–Tin Perovskite Solar Cells

Zhang K, Vincze A, Metwalli E, Zhang J, Liu C, Meng W, Zhang B, Tian J, Heumüller T, Xie Z, Luo J, Osvet A, Unruh T, Lüer L, Li N, Brabec C (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Advanced Functional Materials Wiley-VCH Verlag

DOI: 10.1002/adfm.202303455

Abstract

Mixed lead and tin (Pb/Sn) hybrid perovskites exhibit a great potential in fabricating all-perovskite tandem devices due to their easily tunable bandgaps. However, the energy deficit and instability in Pb/Sn perovskite solar cells (PSCs) constrain their practical applications, which renders defect passivation engineering indispensable to develop highly efficient and long-term stable PSCs. Herein, the mechanisms of strain tailoring and defect passivation in Pb/Sn PSCs by 2D ligands are investigated. The 2D ligands include electroneutral cations with long alkyl chain (LAC), iodates with relatively short alkyl chain (SAC) and their mixtures. This study reveals that LAC ligands facilitate the relaxation of tensile strain in perovskite films while SAC ligands cause strain buildup. By mixing LAC/SAC ligands, tensile strain in perovskite films can be balanced which improves solar cell performance. PSCs with admixed β-guanidinopropionic acid (GUA)/phenethylammonium iodide (PEAI) exhibit enhanced open circuit voltage and fill factor, which is attributed to reduced nonradiative recombination losses in the bulk and at the interfaces. Furthermore, the operational stability of PSCs is slightly improved by the mixed 2D ligands. This work reveals the mechanisms of 2D ligands in strain tailoring and defect passivation toward efficient and stable narrow-bandgap PSCs.

Authors with CRIS profile

Kaicheng Zhang Institute Materials for Electronics and Energy Technology (i-MEET) Jiyun Zhang Institute Materials for Electronics and Energy Technology (i-MEET) Chao Liu Institute Materials for Electronics and Energy Technology (i-MEET) Wei Meng Institute Materials for Electronics and Energy Technology (i-MEET) Jingjing Tian Institute Materials for Electronics and Energy Technology (i-MEET) Thomas Heumüller Institute Materials for Electronics and Energy Technology (i-MEET) Zhiqiang Xie Institute Materials for Electronics and Energy Technology (i-MEET) Junsheng Luo Institute Materials for Electronics and Energy Technology (i-MEET) Andres Osvet Institute Materials for Electronics and Energy Technology (i-MEET) Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden) Larry Lüer Institute Materials for Electronics and Energy Technology (i-MEET) Ning Li Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Additional Organisation(s)

Graduiertenkolleg 2495 Energiekonvertierungssysteme: von Materialien zu Bauteilen (Energy Conversion Systems: From Materials to Devices)

Involved external institutions

Institut de Recherche de Chimie Paris (IRCP) FR France (FR) International Laser Centre Bratislava SI Slovenia (SI)

How to cite

APA:

Zhang, K., Vincze, A., Metwalli, E., Zhang, J., Liu, C., Meng, W.,... Brabec, C. (2023). Impact of 2D Ligands on Lattice Strain and Energy Losses in Narrow-Bandgap Lead–Tin Perovskite Solar Cells. Advanced Functional Materials. https://doi.org/10.1002/adfm.202303455

MLA:

Zhang, Kaicheng, et al. "Impact of 2D Ligands on Lattice Strain and Energy Losses in Narrow-Bandgap Lead–Tin Perovskite Solar Cells." Advanced Functional Materials (2023).

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