Liu Xuan, Jiang Xin, Wang Kaifeng, Miao Chunyang, Zhang Shiming
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, China.
Jiangsu Seenbom Flexible Electronics Institute Co., Ltd., Level 2 Building 5, Zhida Road 6, Nanjing 210043, China.
Materials (Basel). 2022 Nov 8;15(22):7883. doi: 10.3390/ma15227883.
Due to the low cost, light weight, semitransparency, good flexibility, and large manufacturing area of organic solar cells (OSCs), OSCs have the opportunity to become the next generation of solar cells in some specific applications. So far, the efficiency of the OSC device has been improved by more than 20%. The optical band gap between the lowest unoccupied molecular orbital (LUMO) level and the highest occupied molecular orbital (HOMO) level is an important factor affecting the performance of the device. Selenophene, a derivative of aromatic pentacyclic thiophene, is easy to polarize, its LUMO energy level is very low, and hence the optical band gap can be reduced. In addition, the selenium atoms in selenophene and other oxygen atoms or sulfur atoms can form an intermolecular interaction, so as to improve the stacking order of the active layer blend film and improve the carrier transport efficiency. This paper introduces the organic solar active layer materials containing selenium benzene in recent years, which can be simply divided into donor materials and acceptor materials. Replacing sulfur atoms with selenium atoms in these materials can effectively reduce the corresponding optical band gap of materials, improve the mutual solubility of donor recipient materials, and ultimately improve the device efficiency. Therefore, the sulfur in thiophene can be completely replaced by selenium or oxygen of the same family, which can be used in the active layer materials of organic solar cells. This article mainly describes the application of selenium instead of sulfur in OSCs.
由于有机太阳能电池（OSC）成本低、重量轻、具有半透明性、柔韧性好且制造面积大，在某些特定应用中，有机太阳能电池有机会成为下一代太阳能电池。到目前为止，有机太阳能电池器件的效率已提高了20%以上。最低未占据分子轨道（LUMO）能级与最高占据分子轨道（HOMO）能级之间的光学带隙是影响器件性能的重要因素。硒吩作为芳香族五环噻吩的衍生物，易于极化，其LUMO能级非常低，因此可以减小光学带隙。此外，硒吩中的硒原子与其他氧原子或硫原子可形成分子间相互作用，从而改善活性层共混膜的堆积顺序并提高载流子传输效率。本文介绍了近年来含硒苯的有机太阳能活性层材料，可简单分为供体材料和受体材料。在这些材料中用硒原子取代硫原子可有效降低材料相应的光学带隙，提高供体-受体材料的互溶性，最终提高器件效率。因此，噻吩中的硫可完全被同族的硒或氧取代，可用于有机太阳能电池的活性层材料。本文主要描述了硒取代硫在有机太阳能电池中的应用。
