Investigating the effect of heteroatom substitution in 2,1,3-benzoxadiazole and 2,1,3-benzothiadiazole compounds for organic photovoltaics
Investigating the effect of heteroatom substitution in 2,1,3-benzoxadiazole and 2,1,3-benzothiadiazole compounds for organic photovoltaics
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研究 2,1,3-苯并恶二唑和 2,1,3-苯并噻二唑化合物中杂原子取代对有机光伏的影响
DOI：
10.1039/c7tc05075e
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发表时间：
2018
影响因子：
6.4
通讯作者：
Cameron J
中科院分区：
文献类型：
--
作者：
Cameron J
提出了两种新的供体-受体-供体分子，其特征是 2,1,3-苯并噻二唑 (BT) 或 2,1,3-苯并恶二唑 (BO)，并由苯并呋喃基-噻吩基基团封端。这些新型化合物的结构仅在受体单元中的一个杂原子不同。用氧取代 BT 中的硫原子可显着改善 PC61BM 混合物在本体异质结有机光伏 (BHJ OPV) 器件中的性能：当改用 BO 类似物时，观察到 PCE 增加了 10 倍。这部分是由于用氯化溶剂旋涂形成的供体-富勒烯共混物具有更好的形态。
Two new donor–acceptor−donor molecules, featuring either 2,1,3-benzothiadiazole (BT) or 2,1,3-benzoxadiazole (BO) and capped by benzofuranyl-thienyl groups, are presented. The structures of these novel compounds differ only in the identity of one heteroatom in the acceptor unit. Replacement of the sulfur atom in BT with oxygen results in a marked improvement in the performance of PC61BM blends in bulk heterojunction organic photovoltaic (BHJ OPV) devices: a 10-fold increase in PCE is observed when switching to the BO analogue. This is partly due to a preferable morphology in the donor-fullerene blends formed upon spin-coating from chlorinated solvents.