Affiliation:
1. State Key Laboratory and Institute of Elemento‐Organic Chemistry Frontiers Science Center for New Organic Matter The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Renewable Energy Conversion and Storage Center (RECAST) Tianjin Key Laboratory of functional polymer materials College of Chemistry Nankai University Tianjin 300071 China
2. State Key Laboratory of Separation Membranes and Membrane Processes School of Chemistry Tiangong University Tianjin 300387 China
3. School of Materials Science and Engineering National Institute for Advanced Materials Renewable Energy Conversion and Storage Center (RECAST) Nankai University Tianjin 300350 China
Abstract
Abstract2D conjugated extension on central units of small molecular acceptors (SMAs) has gained great successes in reaching the state‐of‐the‐art organic photovoltaics. Whereas the limit size of 2D central planes and their dominant role in constructing 3D intermolecular packing networks are still elusive. Thus, by exploring a series of SMAs with gradually enlarged central planes, it is demonstrated that, at both single molecular and aggerated levels, there is an unexpected blue‐shift for their film absorption but preferable reorganization energies, exciton lifetimes and binding energies with central planes enlarging, especially when comparing to their Y6 counterpart. More importantly, the significance of well‐balanced molecular packing modes involving both central and end units is first disclosed through a systematic single crystal analysis, indicating that when the ratio of central planes area/end terminals area is no more than 3 likely provides a preferred 3D intermolecular packing network of SMAs. By exploring the limit size of 2D central planes, This work indicates that the structural profiles of ideal SMAs may require suitable central unit size together with proper heteroatom replacement instead of directly overextending 2D central planes to the maximum. These results will likely provide some guidelines for future better molecular design.
Funder
Ministry of Science and Technology of the People's Republic of China
National Key Research and Development Program of China
National Natural Science Foundation of China
Higher Education Discipline Innovation Project
Cited by
3 articles.
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