A vertical antioxidant strategy for high performance wide band gap tin perovskite photovoltaics

Hu, Fan; Chen, Chun‐Hao; Lou, Yanhui; Teng, Tian-Yu; Shi, Yiran; Xia, Yu; Wang, Kaili; Chen, Jing; Wang, Zhao-Kui; Liao, Liang‐Sheng

doi:10.1039/d2ta09363d

Cited by 12 publications

(5 citation statements)

References 44 publications

(57 reference statements)

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“…The content of Sn 4+ from XPS measurement was effectively suppressed when the acidity of the precursor solution increased, and the highest PCE was obtained when pH = 4.62. However, it should be noticed that when pH further lessened, PCE declined, which was mainly attributed to the high doping concentration and the detrimental effect of acidity on perovskites [53]. Yan et al introduced ammonium hypophosphite (AHP, NH 4 H 2 PO 2 ) additive to treat the FASnI 3 perovskite precursor to suppress the oxidation of Sn 2+ .…”

Section: Hydrazine and Its Derivativesmentioning

confidence: 99%

Ligand Engineering in Tin-Based Perovskite Solar Cells

Cao

et al. 2023

Nano-Micro Lett.

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Perovskite solar cells (PSCs) have attracted aggressive attention in the photovoltaic field in light of the rapid increasing power conversion efficiency. However, their large-scale application and commercialization are limited by the toxicity issue of lead (Pb). Among all the lead-free perovskites, tin (Sn)-based perovskites have shown potential due to their low toxicity, ideal bandgap structure, high carrier mobility, and long hot carrier lifetime. Great progress of Sn-based PSCs has been realized in recent years, and the certified efficiency has now reached over 14%. Nevertheless, this record still falls far behind the theoretical calculations. This is likely due to the uncontrolled nucleation states and pronounced Sn (IV) vacancies. With insights into the methodologies resolving both issues, ligand engineering-assisted perovskite film fabrication dictates the state-of-the-art Sn-based PSCs. Herein, we summarize the role of ligand engineering during each state of film fabrication, ranging from the starting precursors to the ending fabricated bulks. The incorporation of ligands to suppress Sn2+ oxidation, passivate bulk defects, optimize crystal orientation, and improve stability is discussed, respectively. Finally, the remained challenges and perspectives toward advancing the performance of Sn-based PSCs are presented. We expect this review can draw a clear roadmap to facilitate Sn-based PSCs via ligand engineering.

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Section: Hydrazine and Its Derivativesmentioning

confidence: 99%

Ligand Engineering in Tin-Based Perovskite Solar Cells

Cao

et al. 2023

Nano-Micro Lett.

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“…One of the most prevalent acids used in Sn-PSCs is PEDOT:PSS. ,− Although PEDOT:PSS generally leads to lower PCEs than alternative hole transport layers, such as Spiro-OMeTAD or PTAA, in Pb-PSCs, PEDOT:PSS is ubiquitous in Sn-PSCs. Here, PEDOT:PSS typically has a pH of 1.0–2.0 for the common VP Al 4083 grade and contains sulfonate groups, which are expected to coordinate to SnI 2 through acting as Lewis bases.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, Sn-HPs are fabricated from a DMF:DMSO cosolvent, with ratios on the order of 4:1 to 13:1. ,, To more directly link our results with Sn-HP precursor solutions used for PV device fabrication, FASnI 3 (FA: formamidinium) solutions in a mixed solvent of DMF and DMSO (6:1) with 5 mol % of p -TSA were heated at 40, 60, and 80 °C for 30 min (Figure b) in a nitrogen-filled glovebox. We find that the solution color changes with 40 °C heating, and with increasing temperature the color change is more intense, indicative of a faster rate of oxidation.…”

Section: Resultsmentioning

confidence: 99%

Oxidation in Tin Halide Perovskites: Influence of Acidic and Basic Additives

Hossain,

Joy,

Draffen

et al. 2023

ACS Appl. Energy Mater.

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“…This indicates that NH 2 group and F 3 group can interact with the perovskite, whereas CH 3 group does not exhibit such interactions. [24,25] After establishing the anchoring issue, we will focus on the diverse effects of molecular dipole moments in different orientations on the buried interface. As shown in Figure 2a, two distinct coupling agent molecules were employed for buried interface modification in the perovskite layer.…”

Section: Methodsmentioning

confidence: 99%

Electronically Manipulated Molecular Strategy Enabling Highly Efficient Tin Perovskite Photovoltaics

Teng,

Su,

et al. 2024

Angew Chem Int Ed

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Buried interface modification can effectively improve the compatibility between interfaces. Given the distinct interface selections in perovskite solar cells (PSCs), the applicability of a singular modification material remains limited. Consequently, in response to this challenge, we devised a tailored molecular strategy based on the electronic effects of specific functional groups. Therefore, we prepared three distinct silane coupling agents, and due to the varying inductive effects of these functional groups, the electronic distribution and molecular dipole moments of the coupling agents are correspondingly altered. Among them, trimethoxy (3,3,3‐trifluoropropyl)‐silane (F3‐TMOS), which possesses electron‐withdrawing groups, generates a molecular dipole moment directed toward the hole transport layer (HTL). This approach lowers the work function of the HTL, optimizes the energy level alignment, reduces the open‐circuit voltage loss, and facilitates carrier transport. Furthermore, through the buffering effect of the coupling agent, the interface strain and lattice distortion caused by annealing the perovskite are reduced, enhancing the stability of the tin‐based perovskite. Encouragingly, tin PSCs treated with F3‐TMOS achieved a champion efficiency of 14.67%. This strategy provides an expedient avenue for the design of buried interface modification materials, enabling precise molecular adjustments in accordance with distinct interfacial contexts to ameliorate mismatched energetics and enhance carrier dynamics.

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A vertical antioxidant strategy for high performance wide band gap tin perovskite photovoltaics

Abstract: Despite the promising charac-teristics of tin-based perovskite solar cells (TPSCs), one obvi-ous limitation is the rapid oxi-dation of Sn2+, resulting in poor device performance and stabil-ity. Here, we introduced differ-ent...

Cited by 12 publications

References 44 publications

Ligand Engineering in Tin-Based Perovskite Solar Cells

Ligand Engineering in Tin-Based Perovskite Solar Cells

Oxidation in Tin Halide Perovskites: Influence of Acidic and Basic Additives

Electronically Manipulated Molecular Strategy Enabling Highly Efficient Tin Perovskite Photovoltaics

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