A strategy to assist crystallization for effective as well as stable perovskite solar cells

Nov 29, 2022 04:34 PM ET
  • Recent growths have enabled perovskite solar cells (PSCs) to achieve power conversion effectiveness going beyond 25.7%; thus, these tools are considered increasing stars in the photovoltaics area. Nonetheless, the uniform crystallization of perovskite may bring about disordered crystalline positionings as well as defects in the bulk phase and also grain limits, thereby restricting the performance and also stability of PSCs. Defect passivation and also crystallization law are considered reliable strategies to boost the performance of these gadgets.
A strategy to assist crystallization for effective as well as stable perovskite solar cells
Image: Journal of Energy Chemistry

Metal-organic framework (MOF) products play a vital role in regulating perovskite crystallization and passivation defects and boosting service provider flexibility owing to their highly permeable structures, solid functional framework design, as well as various other benefits. Nonetheless, present study suggests that most MOFs put on PSCs do not have the functional design of their frameworks. In this instance, a mixed-ligands strategy can not just layout useful MOFs with novel frameworks yet additionally passivate defects and manage perovskite crystallization by means of the synergistic result of the chosen ligands.

Aide scientist Yayu Dong, teachers Yulin Yang and also Ruiqing Fan, associate professor Jian Zhang, and also others of Harbin Institute of Technology recently released a manuscript, labelled "Metal-Organic Frameworks with Mixed-Ligands Strategy as Heterogeneous Nucleation Center to Assist Crystallization for Reliable as well as Stable Perovskite Solar Cells," in the Journal of Energy Chemistry.

The flexible organic ligand 5-(4-(1H-1,2,4-triazole-1-yl)benzyl)-1 H-tetrazole (Httb) was selected to construct a novel 3D MOF (Cd-Httb). A second ligand, 1,4-dicarboxybenzene (H2BDC), was after that introduced to this MOF to efficiently create one more novel 3D MOF (Cd-Httb-BDC).

Compared with the control as well as Cd-Httb, Cd-Httb-BDC created with combined ligands served as a nanostructured heterogeneous nucleation seed and also properly assisted the crystallization of high-grade large-grain perovskite movies. It also decreased the thickness of defect states, thereby boosting the performance as well as stability of PSCs.

This work offers a theoretical basis for synthesizing novel functionalized MOFs to prepare PSCs, which is of great relevance for the commercialization of perovskite-based photovoltaic tools.

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