期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 6, 页码 2664-2670出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta10461h
关键词
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资金
- National Natural Science Foundation of China [51673201, 91333204, 21325419, 91633301]
- Chinese Academy of Sciences [XDB12030200]
- NRF of Korea [2015M1A2A2057506, 2015R1D1A1A09056905]
- National Research Foundation of Korea [2015R1D1A1A09056905] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Here, the crucial role of intermolecular pi-pi interactions in A-D-A-type acceptors is examined and a simple yet effective modulation method is presented. By side chain manipulation, two small molecule acceptors, IDT-C6 and IDT-PhC6, are designed and synthesized with different crystalline morphologies. Since n-hexyl side chains have less steric hindrance than hexylphenyl side chains, IDT-C6 exhibits enhanced intermolecular pi-pi interactions relative to IDT-PhC6. Benefiting from the improved charge transport properties of the IDT-C6-based device, a high PCE of 12.5% is recorded, whereas those of the IDT-PhC6-based device delivers a moderate PCE of just 5.6%.
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