Novel A-D-A type small molecules with β-alkynylated BODIPY flanks for bulk heterojunction solar cells
Novel A-D-A type small molecules with β-alkynylated BODIPY flanks for bulk heterojunction solar cells
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用于本体异质结太阳能电池的具有 β-炔基化 BODIPY 侧翼的新型 A-D-A 型小分子
DOI：
10.1016/j.orgel.2017.06.054
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发表时间：
2017-10-01
影响因子：
3.2
通讯作者：
Fang, Yutang
中科院分区：
文献类型：
--
作者：
Liao, Junxu;Xu, Yongjun;Fang, Yutang
设计并合成了一系列以芴、咔唑、苯并二噻吩和吩噻嗪为给电子单元，通过炔基连接BODIPY的新型A-D-A型小分子化合物F-BDP、C-BDP、BBDP和P-BDP。炔基桥的引入导致分子吸收光谱扩展到320-700 nm范围，具有高的摩尔消光系数（10（5）cm（-1）M-1）和强的荧光猝灭。分子显示出相对低的HOMO，范围为-5.02至-5.24 eV，如从循环伏安法测量估计的。有趣的是，以BDT为给体的B-BDP在固态下比F-BDP、C-BDP和P-BDP表现出更明显的吸收红移。此外，基于B-BDP/PC 71 BM的溶液处理的本体异质结有机太阳能电池呈现出上级电荷传输性能和更有利的纳米尺度形貌，导致显著高于其他对应物的11.84 mA cm（2）的J（sc）和FF，从而实现了4.65%的较高PCE，这是迄今报道的基于BODIPY的有机太阳能电池中的最佳值之一。(C)2017 Elsevier B. V.版权所有。
A serial of novel A-D-A type small molecules with BODIPY linked through alkynyl with various electron donor units such as fluorene, carbazole, benzodithiophene and phenothiazine, namely F-BDP, C-BDP, BBDP and P-BDP, respectively, were designed and synthesized. Introducing the alkynyl bridge leads to extending the molecular absorption spectrum to the range of 320-700 nm with high molar extinction coefficients (10(5) cm(-1) M-1) and strong fluorescence quenching. The molecules showed relatively low HOMO ranging from -5.02 to -5.24 eV as estimated from cyclic voltammetry measurements. Interestingly, B-BDP with BDT as donor exhibits more obviously red-shifted absorption in the solid state compared to F-BDP, C-BDP and P-BDP. Furthermore, the solution-processed bulk-heterojunction organic solar cell based on B-BDP/PC71BM present superior charge transport property and more favorable nanoscale morphology, resulting in a significant higher J(sc) of 11.84 mA cm(2) and FF than the other counterparts, thus achieved a higher PCE of 4.65%, which is one of the best values among the ever reported BODIPY based organic solar cells. (C) 2017 Elsevier B.V. All rights reserved.