Molecular-Perspective Insights into Top Interface Passivation in Inverted Perovskite Solar Cells.

Inverted perovskite solar cells (IPSCs) have emerged as a promising research focus in photovoltaics due to their outstanding optoelectronic properties. However, the further development of IPSCs on efficiency and stability is still limited by the rich defects of perovskites, especially at the top interface of the film. To address the challenge of defects, researchers have demonstrated various studies to suppress the defect effects and enhance the device performance of IPSCs.

Multidimensional Modulation via Tailored Covalent Organic Frameworks Enables Stable Inverted Perovskite Solar Cells with 26.21% Efficiency.

Despite the remarkable advancements in inverted perovskite solar cells, their commercialization remains hindered by critical bottlenecks in efficiency and stability stemming from inadequate crystallization and unfavorable interfacial states. Herein, for the first time, a judiciously designed hydrazine-linked covalent organic framework (COF) with long alkane phosphate branch chains, named 12-SD-COF, is synthesized and integrated into the perovskite precursor to achieve multidimensional regulation of crystallization, defect states, and charge separation synergistically. It is found that the 12-SD-COF featuring periodic pores, large planar structure, and abundant binding groups is extruded from the precursor solution onto the buried interface, surface, and grain boundaries, facilitating oriented crystallization while eliminating defects of perovskites, thereby yielding high-quality crystals with suppressed non-radiative recombination.

A Versatile Bridging Molecule Managed the Buried SnO/Perovskite Interface for Efficient and Stable Perovskite Solar Cells.

Buried interface in perovskite solar cells (PSCs) is a critical determination for the performance and stability because it dominates the crystallization of the perovskite layer, non-radiative recombination, and ion migration at the interfaces. Herein, a novel versatile modifier, potassium sucrose octasulfate (KSOS) which is rich in sulfonic groups and potassium ions, is introduced for bridging the buried perovskite and SnO interface, to improve the interfacial states and further the device performance. It is found that KSOS serves as a bridge that can not only passivate defects in perovskite and SnO through multi-site strengthening chemical binding, thus effectively inhibiting non-radiation recombination and suppressing ion migration, but also can optimize the surface state of SnO layer, improve the crystallization of perovskite absorber, thus ultimately achieving a gratifying efficiency of 25.

Optimal Methylammounium Chloride Additive for High-Performance Perovskite Solar Cells.

Organic-inorganic lead halide perovskite solar cells (PSCs) have presented promising improvements within recent years due to the superior photophysical properties of perovskites. The efficiency of PSCs is closely related to the quality of the of the perovskite film. Additive engineering is an effective strategy to regulate the crystallization of perovskite film.

Micromolecule Postdeposition Process for Highly Efficient Inverted Perovskite Solar Cells.

Inverted perovskite solar cells (PSCs) have achieved great development, contributed by the advance of self-assembled monolayer (SAM) hole-transporting layers (HTLs) due to their distinctive molecular designability. However, SAM HTLs still present challenges of achieving a compact and ordered surface, resulting in vacancies and defects at the interface as well as adversely affecting the growth of perovskites. In this work, we propose a micromolecule postdeposition process to design the SAM HTL interface and form high-quality perovskites to achieve highly efficient inverted PSCs.

SnO-Based Interfacial Engineering towards Improved Perovskite Solar Cells.

Interfacial engineering is of great concern in photovoltaic devices. Metal halide perovskite solar cells (PSCs) have garnered much attention due to their impressive development in power conversion efficiencies (PCEs). Benefiting from high electron mobility and good energy-level alignment with perovskite, aqueous SnO as an electron transport layer has been widely used in n-i-p perovskite solar cells.

Recent Advances in Self-Assembled Molecular Application in Solar Cells.

Perovskite solar cells (PSCs) have attracted much attention due to their low cost, high efficiency, and solution processability. With the development of various materials in perovskite solar cells, self-assembled monolayers (SAMs) have rapidly become an important factor in improving power conversion efficiency (PCE) due to their unique physical and chemical properties and better energy level matching. In this topical review, we introduced important categories of self-assembled molecules, energy level modulation strategies, and various characteristics of self-assembled molecules.