期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201701370
关键词
morphology; non-fullerene; organic solar cells; photovoltaics; surface tension; small molecular acceptors; ternary blends
类别
资金
- National Basic Research Program of China (973 Program) [2013CB834701, 2014CB643501]
- ShenZhen Technology and Innovation Commission [JCYJ20170413173814007]
- Hong Kong Research Grants Council [T23-407/13 N, N_HKUST623/13, 16305915, 16322416, 606012, 16303917]
- HK JEBN Limited
- HKUST president's office [FP201]
- National Science Foundation of China [21374090]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/083/15]
Ternary organic solar cells (OSCs) have attracted much research attention, as they can maintain the simplicity of the single-junction device architecture while broadening the absorption range of OSCs. However, one main challenge that limits the development of ternary OSCs is the difficulty in controlling the morphology of ternary OSCs. In this paper, an effective approach to control the morphology is presented that leads to multiple cases of efficient nonfullerene ternary OSCs with efficiencies of up to 11.2%. This approach is based on a donor polymer with strong temperature dependent aggregation properties processed from hot solutions without any solvent additives and a pair of small molecular acceptors (SMAs) that have similar surface tensions and thus low propensity to form discrete phases. Such a ternary blend exhibits a simplified bulk-heterojunction morphology that is similar to the morphology of previously reported binary blends. As a result, an almost linear relationship between V-OC and film composition is observed for all nonfullerene ternary devices. Meanwhile, by carefully designing a control system with a large interfacial tension, a different phase separation and V-OC dependence is demonstrated. This morphology control approach can be applicable to more material systems and accelerates the development of the ternary OSC field.
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