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中文摘要：
富勒烯及其衍生物是一类重要的n-型电子受体材料，在有机太阳能电池器件中发挥了至关重要的作用．但由于富勒烯材料吸光波长较窄、亲和能高、溶解性差等，严重限制了富勒烯作为有机太阳能电池n-型电子受体材料的更广泛应用和器件性能的进一步提升．非富勒烯n-型电子受体材料具有能级可调、合成简便、加工成本低、溶解性能优异等特点，更重要的是，此类材料在可见太阳光光谱中比富勒烯及其衍生物材料有更加宽广的吸收范围；近年来，受到越来越多的关注和研究．本文较为系统地阐述了非富勒烯小分子材料作为有机太阳能电池n-型电子受体材料的研究进展，并对其发展前景作了展望．
英文摘要：
Bulk heterojunction organic photovoltaics have been the subject of intensive academic interest over the past two decades. Numerous recent efforts have been directed towards this area with the vision of developing next-generation low-cost solar cells. In the field of bulk heterojunction organic photovoltaics, fullerene and its derivatives are an important class of n-type electron acceptor materials. However, their disadvantages such as narrow wavelength absorption, high affinity, poor solubility, have severely limited their wide application as electron acceptors for organic solar cells and have largely hampered further improvement of the device performance. Recently, a number of research efforts have been focused on the development of novel non-fullerene n-type small-molecule acceptors. Various design rules and interesting new materials have been explored. The non-fullerene n-type small-molecule acceptors usually appear to possess lots of attractive advantages, such as adjustable energy levels, facile synthesis, good solubility, low processing cost. More important, when compared to the fullerene and its derivatives, this kind of small-molecule acceptors has wider spectral absorption that allows to absorb more sunlight to generate electricity. Recent breakthroughs rely mostly on the development of novel high-performance acceptor materials and optimization of the device structures. The up-to-date power conversion efficiencies exceeding 4% with using non-fullerene small-molecule acceptor materials in bulk heterojunction organic solar cells have been achieved. In this review, recent advances of non-fullerene small-molecule n-type acceptor materials for organic solar cells are reviewed, including rylene diimide-based acceptors, pentacene-based acceptors, benzothiadiazole-based acceptors, 1,4-diketopyrrolo-[3,4-c]- pyrrole （DPP）-based acceptors, fluorene-based acceptors, fluoranthene-fused imide-based acceptors and so on. Meanwhile, the future trends on material design and development have also been discussed. This
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