Directional Transformation of Heterometallic Oxo Clusters: A New Approach to Prepare Wide‐Bandgap Cathode Interlayers for Perovskite Solar Cells

Abstract

Typical wide‐band gap cathode interlayer materials are difficulty in reducing interface recombination without limiting charge transport in perovskite solar cells (PSCs). Here, a lead‐doped titanium‐oxo cluster protected by S‐containing ligands is introduced at the interface of perovskite and SnO2. By in situ heating, the cluster is transformed into PbSO4‐PbTi3O7 heterostructure. The oxygen atoms from sulfate ion in heterostructure connect with iodine from perovskite to boost interfacial electron extraction and reduce charge recombination. While the yielded metallic interface between PbSO4 and PbTi3O7 promotes the electron transport across the interface. Finally, an efficiency as high as 24.2 % for the modified PSC is obtained. The heterostructure well‐stabilize the interface of perovskite and SnO2, to greatly improve the device stability. This work provides a novel strategy to prepare wide‐band gap cathode interlayer by directional transformation of heterometallic oxo clusters.

All-catecholate-stabilized black titanium-oxo clusters for efficient photothermal conversion

“…Titanium-oxo clusters (TOCs) have garnered signicant recent attention owing to their fascinating structures and potential applications in water splitting, 1-3 solar cells, [4][5][6][7] pollutant degradation, 8,9 and catalysis. [10][11][12][13][14][15] The investigation of TOCs is also motivated by their relevance to the structural and reactivity models of TiO 2 materials.…”

Beyond Anion Template: Polyoxometalate as a Property Influencer in High-Nuclearity Silver Thiolate Cluster

“…The ongoing interests in designing and synthesizing high-nuclearity silver nanoclusters with atomic precision stems from the desire to understand their distinctive physicochemical properties and how the properties relate to their structures. − Polyoxometalates (POMs) have been widely employed as anionic templates to construct novel silver clusters because of their adaptable structures, negatively charged nature, and abundant terminal oxygen sites for Ag coordination. − Although this strategy has successfully extended the structural boundaries of silver clusters, the features of POMs, such as structures, compositions, and charge numbers, have barely been utilized to adjust the properties of POM-templated silver clusters. − However, the introduction of heteroatoms into silver nanoclusters at the atomic level can significantly affect their properties, particularly their photophysical properties. − On the basis of these studies, we hypothesize that POM templates with similar structures but varying compositions and charge numbers can influence the behaviors of the resulting silver clusters in properties.…”