AI Article Synopsis
- The study focuses on porphyrins with an A-π-D-π-A configuration, aiming to enhance their properties through variations in the π-bridge components (thiophene and selenophene) and connection types (single, ethylenic, or fused bonds).
- It highlights the importance of π-bridges in influencing molecular structure and performance, while revealing that their primary role is to enable strong interactions between donor and acceptor fragments, rather than merely showcasing their own characteristics.
- Results indicate that optimizing π-bridge properties can lead to improved electronic performance, such as higher open circuit voltages and stable film morphologies, suggesting a new descriptor for evaluating π-bridges in molecular design.
Article Abstract
Establishing the structure of porphyrins with a A-π-D-π-A configuration is one of the effective strategies to maintain their dominance and compensate shortcomings through flexible changes in fragments. In this regard, π-bridges have attracted wide attention as a parameter affecting molecular backbones, electron transfer, energy levels, absorption, and other properties. However, the essence and influence of π-bridges have not yet been confirmed. In order to satisfy the requirements of intelligent application in molecular design, this study aimed to investigate the control effect of differences in π-bridge composition (thiophene and selenophene) and connection type (single bonds, ethylenic bonds and fused) on photoelectric performance. Y6 and PCBM were used as acceptors to build donor/acceptor (D/A) interfaces and characterize the film morphology in three dimensions. Results showed that the essence of π-bridges involves a strong bridging effect (adjusting ability) between A and D fragments rather than highlighting its own nature. The large value could obtain high open circuit voltages (), large separation and small recombination rates as well as stable and tight morphology. Therefore, adjusting ability is a unified descriptor for evaluating π-bridges, and it is an effective strategy to adjust material properties and morphology. This insight and discovery may provide a new evaluation descriptor for the screening and design of π-bridges.
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| http://dx.doi.org/10.1039/d4cp02787f | DOI Listing |
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