Strategies to improve the mechanical robustness of metal halide perovskite solar cells

Li, Muzhi; Johnson, Samuel; Gil-Escrig, Lidon; Sohmer, Maayan; Figueroa Morales, Carlos A.; Kim, Hongki; Sidhik, Siraj; Mohite, Aditya; Gong, Xiwen; Etgar, Lioz; Bolink, Henk J.; Palmstrom, Axel; McGehee, Michael D.; Rolston, Nicholas

doi:10.1039/d3ya00377a

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…The films were aged with a glass substrate placed on top to simulate encapsulation/device integration without adding layers that could electrochemically interact with the MHP. This prevented the expulsion of iodine from the MHP lattice with a surface directly above the film and may explain why the using a solvent exchange technique [41] . The electrode was then hot-pressed onto the 2D MHP layer at 100 psi film degraded significantly more without the additional glass substrate (as shown by the redshift in the photoluminescence peaks in Supplementary Figures 2 and 3, Supplementary Table 1).…”

Section: Resultsmentioning

confidence: 99%

Use of carbon electrodes to reduce mobile ion concentration and improve reliability of metal halide perovskite photovoltaics

Penukula,

Tippin,

et al. 2024

Energy Mater

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Ion migration is one of the prime reasons for the rapid degradation of metal halide perovskite solar cells (PSCs), and we report on a method for quantifying mobile ion concentration (No) using a transient dark current measurement. We perform both ex-situ and in-situ measurements on PSCs and study the evolution of No in films and devices under a range of temperatures. We also study the effect of device architecture, top electrode chemistry, and metal halide perovskite composition and dimensionality on No. Two-dimensional perovskites are shown to reduce the ion concentration along with inert C electrodes that do not react with halides by ~99% while also improving mechanical reliability by ~250%. We believe this work can provide design guidelines for the development of stable PSCs through the lens of minimizing mobile ions and their evolution over time under operational conditions.

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Section: Resultsmentioning

confidence: 99%

Use of carbon electrodes to reduce mobile ion concentration and improve reliability of metal halide perovskite photovoltaics

Penukula,

Tippin,

et al. 2024

Energy Mater

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“…Fracture energy (G c ) results show that 4Cl-BZS increases the mechanical strength of the perovskite-C 60 interface (fig. S2) ( 37 ).…”

Section: Theoretical Investigationsmentioning

confidence: 99%

Improved charge extraction in inverted perovskite solar cells with dual-site-binding ligands

Chen,

Liu,

et al. 2024

Science

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Inverted (pin) perovskite solar cells (PSCs) afford improved operating stability in comparison to their nip counterparts but have lagged in power conversion efficiency (PCE). The energetic losses responsible for this PCE deficit in pin PSCs occur primarily at the interfaces between the perovskite and the charge-transport layers. Additive and surface treatments that use passivating ligands usually bind to a single active binding site: This dense packing of electrically resistive passivants perpendicular to the surface may limit the fill factor in pin PSCs. We identified ligands that bind two neighboring lead(II) ion (Pb 2+ ) defect sites in a planar ligand orientation on the perovskite. We fabricated pin PSCs and report a certified quasi–steady state PCE of 26.15 and 24.74% for 0.05– and 1.04–square centimeter illuminated areas, respectively. The devices retain 95% of their initial PCE after 1200 hours of continuous 1 sun maximum power point operation at 65°C.

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Mechanical and Ionic Characterization for Organic Semiconductor‐Incorporated Perovskites for Stable 2D/3D Heterostructure Perovskite Solar Cells

Sun,

Penukula,

et al. 2024

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Hybrid metal halide perovskite (MHP) materials, while being promising for photovoltaic technology, also encounter challenges related to material stability. Combining 2D MHPs with 3D MHPs offers a viable solution, yet there is a gap in the understanding of the stability among various 2D materials. The mechanical, ionic, and environmental stability of various 2D MHP ligands are reported, and an improvement with the use of a quater‐thiophene‐based organic cation (4TmI) that forms an organic‐semiconductor incorporated MHP structure is demonstrated. It is shown that the best balance of mechanical robustness, environmental stability, ion activation energy, and reduced mobile ion concentration under accelerated aging is achieved with the usage of 4TmI. It is believed that by addressing mechanical and ion‐based degradation modes using this built‐in barrier concept with a material system that also shows improvements in charge extraction and device performance, MHP solar devices can be designed for both reliability and efficiency.

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Strategies to improve the mechanical robustness of metal halide perovskite solar cells

Abstract: We demonstrate the fragility of perovskite solar cells is typically in the small molecule electron transport layer and show strategies for designing more mechanically and operationally robust devices by improving the layers and interfaces.

Cited by 6 publications

References 41 publications

Use of carbon electrodes to reduce mobile ion concentration and improve reliability of metal halide perovskite photovoltaics

Use of carbon electrodes to reduce mobile ion concentration and improve reliability of metal halide perovskite photovoltaics

Improved charge extraction in inverted perovskite solar cells with dual-site-binding ligands

Mechanical and Ionic Characterization for Organic Semiconductor‐Incorporated Perovskites for Stable 2D/3D Heterostructure Perovskite Solar Cells

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