Moisture Uptake Relaxes Stress in Metal Halide Perovskites at the Expense of Stability

ACS Energy Letters, Год журнала: 2024, Номер 9(8), С. 4153 - 4161

Опубликована: Июль 30, 2024

Previous studies have shown that the degradation rate of metal halide perovskites in an ambient atmosphere increases with amount tensile stress, which primarily arises from coefficient thermal expansion mismatch substrate. In this work, we show first evidence stress relaxation perovskite films resulting moisture uptake. Indeed, for multiple compositions observe tension relaxes rapidly conditions, as compared to inert quartz crystal microbalance measurements showing a mass density increase on similar time scale indicative The uptake at free surfaces, including grain boundaries, can reduce constrained film, how adatom diffusion reduces residual following thin film formation. Unfortunately, catalyze other mechanisms such PbI2 formation or transition nonperovskite structural phase. Stress-induced is especially important problem all-inorganic because they are annealed much higher temperatures, causing high stress. It explains unusually poor stability these perovskites. Using diethyl ether antisolvent bath attach CsPbI2Br substrate lower temperature, reduced initial strain 0.43 ± 0.04% 0.12 0.05%, thus reducing driving force and improving its phase by over factor 15.

Язык: Английский

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Effect of Chlorine Inclusion in Wide Band Gap FAPbBr₃ Perovskites

Advanced Optical Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 25, 2024

Abstract Wide bandgap perovskites have recently gained attention owing to their physical properties, versatility, and potential in various optoelectronic devices including LEDs, detectors, building‐integrated photovoltaics (BIPV). However, BIPV materials must meet conflicting requirements, necessitating high performance, transparency the visible spectrum color neutrality. This study investigates controlled addition of chlorine FAPb(Br 1‐x Cl x ) 3 achieve band gaps exceeding 2.4 eV. Increasing content from = 0.00 0.25 widens gap 2.37 2.52 eV, effectively improving light transparency. Advanced characterization techniques X‐ray diffraction, synchrotron radiation photoelectron spectroscopy, photoluminescence imaging, fast transient absorption complemented by density functional theory, reveal insights into electronic structure, ultrafast recombination dynamics as a function thin film chemical composition. Furthermore, this evaluates energetic disorder, carrier rates, non‐radiative losses for different compositions extracting quantitative parameters such Urbach energy quasi‐Fermi level splitting, offering novel guidelines design optimization emerging photovoltaic (PV) materials. Optimal PV performance metrics are achieved with wide bromine perovskite containing 14% chlorine, striking balance between morphology, transparency, voltage losses.

Язык: Английский

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Roll‐to‐Roll Deposition of Wide‐Bandgap CsFAPbBr₃ Perovskite Solar Cells in Ambient Air with Optimized Ink Formulation

Solar RRL, Год журнала: 2024, Номер unknown

Опубликована: Окт. 4, 2024

The growing demand for sustainable energy solutions has made the development of scalable, efficient, and cost‐effective perovskite solar cells (PSCs) increasingly important. Wide‐bandgap perovskites (WB‐PSCs) stand out due to their efficiency in low‐light conditions use tandem cells. WB‐PSCs are currently behind conventional PSCs upscaling, with limited success printing wide bandgap PSCs. Developing upscaling methods is essential fully realize potential renewable sector. This research addresses roll‐to‐roll (R2R) slot‐die coating Cs 0.05 FA 0.95 PbBr 3 ‐based by focusing on improving film formation process ink formulation. By adding optimal concentration CsBr performing situ characterization, we obtained films enhanced morphology crystallinity ambient (50% RH), without inducing secondary phase formation. In addition, defects eliminated through introducing DMSO: Butanol (9:1) solvent system. R2R coated wide‐bandgap reaches a power conversion (PCE) up 8.97% under 1‐sun 18.3% PCE indoor conditions. corresponding modules 5 × cm 2 active area achieve 5.8%, representing crucial step towards high‐throughput, production modules.

Язык: Английский

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Electron Diffusion Length Effect on Direction of Irradiance in Transparent FAPbBr₃ Perovskite Solar Cells

The Journal of Physical Chemistry Letters, Год журнала: 2024, Номер unknown, С. 10153 - 10161

Опубликована: Сен. 30, 2024

Transparent photovoltaics for building integration represent a promising approach renewable energy deployment. These devices require transparent electrodes to manage transmittance and ensure proper cell operation. In this study, FAPbBr

Язык: Английский

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