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Hybrid gold-based perovskite derivatives typically exhibit low optical bandgaps and high optical absorption coefficients, rendering them promising for photovoltaic applications. In this study, we successfully synthesized six new hybrid gold-based perovskite derivatives, namely [(C6H8N2)(AuI4)(AuI2)](3AMPY), [(C6H14N2)(AuI4)(AuI2)](3AMP), [(C8H12N)(AuI4)](2PEAI), [(C4H14N2O)(AuI4)2](OBA), [(C6H18N2O2)3(AuI4)4(I3)2](DDA), and [(C10H26N2O3)(AuI4)(I3)](TOTA), through a straightforward and efficient hydrothermal method, achieving millimeter-sized single crystals. The structural analysis of the single crystals revealed variations in crystal structures arising from differences in constituent units and their spatial positioning relationships. First-principles calculations ascertained their high optical absorption coefficients in the visible light spectrum and indirect bandgap properties. Theoretical models indicated that the spectroscopic limited maximum efficiency (SLME) values of 3AMPY, 2PEAI, DDA, and TOTA approached approximately 30% in films of 0.5 μm thickness, signifying their potential candidacy as solar cell absorbers. [ABSTRACT FROM AUTHOR]

In the theoretical investigation of Cs 2 TlBiX 6 (X = Cl, Br, I) perovskites, it was observed that Cs 2 TlBiI 6 exhibits excellent thermodynamic phase stability, a direct bandgap of 1.83 eV (HSE06), a remarkably high light absorption coefficient of 105 cm−1, and an elevated spectroscopic limited maximum efficiency of 25.93%. [Display omitted] • The first-principles methods are utilized to investigate the geometrical and electronic structures, photoelectric properties, and defect effects of Cs 2 TlBiX 6 (X = Cl, Br, I) perovskites. • The calculated results reveal that these compounds exhibit excellent structural stability, ideal direct bandgaps, and notable light absorption coefficients (105 cm−1). • Mechanical and thermal stability are evaluated based on structure factors, elastic constants, and regions of stable chemical potential. Numerous endeavors are committed to investigating innovative perovskite materials characterized by superior thermal stability, aimed at their application in the next-generation of photovoltaic technologies. We employ density functional theory to compute the geometrical and electronic structures and to quantify the photoelectric properties of Cs 2 TlBiX 6 (X = Cl, Br, I) perovskites. These compounds exhibit excellent structural stability, ideal direct bandgaps, and high light absorption coefficients (105 cm−1), rendering them well-suited for application as photovoltaic absorbers. We assess mechanical and thermal stability by evaluating structure factors, elastic constants, and regions of stable chemical potential. Additionally, we explore the impact of defects in Cs 2 TlBiI 6 on its photovoltaic performance. [ABSTRACT FROM AUTHOR]

Although perovskite films have excellent extinction coefficients, further increase of the light‐absorbing capacity by increasing the thickness of the active layer is always required in perovskite solar cells (PSCs). However, to maintain the morphology quality of the perovskite layer, the film thickness is subject to certain restrictions. To increase the light absorbance without significantly inflating the perovskite film while keeping the high quality of the perovskite film, herein, we added an aqueous solution of gold nanorods (AuNRs) to the perovskite precursor solution via a so‐called asynchronous synergistic effect (ASE) strategy of water and AuNR. The former improves the quality of the perovskite film during the crystallization process to reduce defect density and enhance carrier mobility. Simultaneously, the latter increases the light absorption of the perovskite layer through the localized surface plasmon resonance (LSPR) effect when the device is exposed to light. We show that the ASE strategy leads to an excellent power conversion efficiency (PCE) of 21.73 % and outstanding long‐term stability, which can retain 95 % of its initial PCE after storage for three months in an air atmosphere. [ABSTRACT FROM AUTHOR]

Tandem solar cells (TSCs) comprising stacked narrow‐bandgap and wide‐bandgap subcells are regarded as the most promising approach to break the Shockley–Queisser limit of single‐junction solar cells. As the game‐changer in the photovoltaic community, organic–inorganic hybrid perovskites became the front‐runner candidate for mating with other efficient photovoltaic technologies in the tandem configuration for higher power conversion efficiency, by virtue of their tunable and complementary bandgaps, excellent photoelectric properties, and solution processability. In this review, a perspective that critically dilates the progress of perovskite material selection and device design for perovskite‐based TSCs, including perovskite/silicon, perovskite/copper indium gallium selenide, perovskite/perovskite, perovskite/CdTe, and perovskite/GaAs are presented. Besides, all‐inorganic perovskite CsPbI3 with high thermal stability is proposed as the top subcell in TSCs due to its suitable bandgap of ≈1.73 eV and rapidly increasing efficiency. To minimize the optical and electrical losses for high‐efficiency TSCs, the optimization of transparent electrodes, recombination layers, and the current‐matching principles are highlighted. Through big data analysis, wide‐bandgap perovskite solar cells with high open‐circuit voltage (Voc) are in dire need in further study. In the end, opportunities and challenges to realize the commercialization of TSCs, including long‐term stability, area upscaling, and mitigation of toxicity, are also envisioned. [ABSTRACT FROM AUTHOR]

Perovskite solar cells (PSCs) have been widely studied during the past 10 years. Albeit the excellent light‐absorption ability, the thickness of the perovskite layer is limited to maintain effective control over morphology and carrier migration. Meanwhile, the quality of perovskite films is a crucial factor affecting the performance of final devices. The traditional one‐step process for preparing triple‐cation perovskite films suffers from small grain size, low crystallization quality, and many surface defects. Herein, in the process of triple‐cation perovskite‐based solar cells, a facile dosing strategy of a silver nanorods (AgNR) aqueous solution into the perovskite precursor is adopted. The localized surface plasmon resonance effect of AgNR enhances the light‐capture ability of the perovskite layer without increasing the thickness. At the same time, the presence of appropriate water helps to obtain high‐quality perovskite films with larger grain size and fewer defects. It is found that the synergy of AgNR and water successfully reduces the defect density and increases mobility significantly. Consequently, a power conversion efficiency of 20.18% and a short‐circuit current (JSC) of 22.08 mA cm−2 is achieved. Meanwhile, an excellent fill factor beyond 82% is reported, which is one of the highest values for triple‐cation hybrid PSCs. [ABSTRACT FROM AUTHOR]

Low-dimensional organo-inorganic hybrid halide perovskites with broadband emission characteristics are crucial for achieving excellent color rendering indices in solid-state lighting devices. Tin-based perovskites are promising lead-free candidates for their narrow band gaps, high charge mobility, and low toxicity. However, the susceptibility of Sn2+ to oxidation results in poor stability and strict synthetic conditions, posing a challenge for commercial applications. Herein, two tin-based perovskites, [Br(CH 2) 2 NH 3 ] 4 SnBr 6 ((BEA) 4 SnBr 6) and [Br(CH 2) 3 NH 3 ] 4 SnBr 6 ((BPA) 4 SnBr 6), were synthesized using an economical and environmental-friendly micromechanical chemical method under air conditions. Both perovskites exhibit a stable broadband orange-red light emission. Despite similar emission wavelengths (∼610 nm) and full width at half maximum (FWHM) (∼110 nm), they show a huge difference in lifetimes and photoluminescence quantum yields (PLQYs). (BPA) 4 SnBr 6 has a much longer lifetime (3.12 μs) and higher PLQY (79 %) than that of (BEA) 4 SnBr 6 due to its triplet self-trapped excitons (STEs) luminescence mechanism. Both compounds demonstrated good air stability; their photoluminescence intensity can be recovered to more than one times the initial value after 18 days in the air. Moreover, a stable warm white LED device with a color rendering index of 95.1 % was fabricated by coating blue phosphor BaMgAl 10 O 17 : Eu2+, green (Sr,Ba) 2 SiO 4 : Eu2+, and orange-red (BPA) 4 SnBr 6 on a commercial 365 nm LED chip. This study provides a novel approach for rapidly synthesizing high-performance tin-based perovskites and fabricating white LED devices with superior color rendering indices. • Two tin-based perovskites of (BEA) 4 SnBr 6 and (BPA) 4 SnBr 6 were prepared by a simple micromechanical chemical method. • The two tin-based perovskites showed excellent stability after 18 days in the air environment. • A broadband emission with a FWHM of ∼112–115 nm and a large Stokes shift of ∼264–270 nm was obtained. • The PLQY of (BPA) 4 SnBr 6 is up to 79 %. • The white LED prepared by (BPA) 4 SnBr 6 achieves a color rendering index of 95.1 %. [ABSTRACT FROM AUTHOR]