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A narrow-bandgap donor polymer for highly efficient as-cast non-fullerene polymer solar cells with a high open circuit voltage
Organic Electronics ( IF 2.7 ) Pub Date : 2018-04-03 , DOI: 10.1016/j.orgel.2018.04.001
Chunmei Chang , Wanbin Li , Xia Guo , Bing Guo , Chennan Ye , Wenyan Su , Qunping Fan , Maojie Zhang

A new narrow-bandgap copolymer PBFTT, based on 4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene (BDT-2F) as donor unit and octyl-3-fluorothieno[3,4-b]thiophene-2-carboxylate (TT) as acceptor unit, was synthesized as donor material for non-fullerene (NF) polymer solar cells (PSCs) application. Compared to the analogue polymer PTB7-Th, PBFTT with two fluorine atoms in the conjugated side chains of BDT possesses a deeper HOMO energy level of −5.47 eV and a slightly enhanced hole mobility of 3.13 × 10−3 cm2 V-1 s-1 versus (vs.) a HOMO energy level of −5.30 eV and a hole mobility of 1.11 × 10−3 cm2 V-1 s-1 for PTB7-Th. Hence, the corresponding PSCs based on PBFTT:ITIC exhibited an optimal PCE of 9.1% with a Voc of 0.94 V, a Jsc of 16.0 mA cm−2, and a FF of 60.5% compared to a PCE of 6.8% with a Voc of 0.81 V, a Jsc of 14.2 mA cm−2 and a FF of 59.1% for PTB7-Th:ITIC-based PSCs. Notably, this PCE is among the highest values for the NF-PSCs based on narrow-bandgap polymer without extra treatments. These results indicate that PBFTT is a promising narrow-bandgap polymer donor material for NF-PSCs application.



中文翻译:

一种窄带隙供体聚合物,用于具有高开路电压的高效铸态非富勒烯聚合物太阳能电池

基于4,8-双(5-(2-(乙基乙基己基)-4-氟噻吩-2-基)苯并[1,2-b:4,5-b']二噻吩(BDT)的新型窄带隙共聚物PBFTT合成了作为供体单元的-2F)和作为受体单元的3-氟噻吩并[3,4- b ]噻吩-2-羧酸辛基酯(TT)作为非富勒烯(NF)聚合物太阳能电池(PSC)应用的供体材料。相比于模拟聚合物PTB7-Th时,PBFTT在BDT的共轭侧链具有两个氟原子具有-5.47电子伏特的更深的HOMO能级和3.13×10稍微增强的空穴迁移率-3 厘米2  V -1 小号- 1与(vs.)HOMO能级为-5.30 eV和空穴迁移率为1.11×10 -3PTB7-Th的 cm 2  V -1  s -1 因此,与PBFTT:ITIC对应的PSC的最佳PCE为9.1%,V oc为0.94 V,J sc为16.0 mA cm -2,FF为60.5%,而PCE的最佳PCE为6.8%。对于基于PTB7-Th:ITIC的PSC ,V oc为0.81 V,J sc为14.2 mA cm -2,且FF为59.1%。值得注意的是,该PCE是基于窄带隙聚合物的NF-PSC的最高值,而无需额外的处理。这些结果表明PBFTT 是用于NF-PSC的有前途的窄带隙聚合物供体材料。

更新日期:2018-04-03
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