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Alkylthienyl substituted asymmetric 2D BDT and DTBT-based polymer solar cells with a power conversion efficiency of 9.2%†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7ta10247j Chuantao Gu 1, 2, 3, 4, 5 , Deyu Liu 5, 6, 7, 8, 9 , Junyi Wang 5, 6, 7, 8, 9 , Qingfen Niu 5, 10, 11, 12, 13 , Chunyang Gu 5, 6, 7, 8, 9 , Bilal Shahid 5, 6, 7, 8, 9 , Bing Yu 1, 2, 3, 4, 5 , Hailin Cong 1, 2, 3, 4, 5 , Renqiang Yang 5, 6, 7, 8, 9
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7ta10247j Chuantao Gu 1, 2, 3, 4, 5 , Deyu Liu 5, 6, 7, 8, 9 , Junyi Wang 5, 6, 7, 8, 9 , Qingfen Niu 5, 10, 11, 12, 13 , Chunyang Gu 5, 6, 7, 8, 9 , Bilal Shahid 5, 6, 7, 8, 9 , Bing Yu 1, 2, 3, 4, 5 , Hailin Cong 1, 2, 3, 4, 5 , Renqiang Yang 5, 6, 7, 8, 9
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An alkyl thiophene unit was employed for the first time as a side chain substituent on an asymmetric benzodithiophene (BDT) building block in the design of novel light-harvesting polymers. A new D–A type polymer (PBDTTh–DTffBT) based on alkylthienyl asymmetric BDT and the well-known 4,7-di(thiophen-2-ethylhexyl)-5,6-difluoro-2,1,3-benzothiadiazole (DTffBT) was synthesized through a palladium catalyzed Stille coupling reaction. Efficient bulk heterojunction solar cells were fabricated by blending PBDTTh–DTffBT with PC71BM. The optimized PBDTTh–DTffBT-based photovoltaic device exhibits an open circuit voltage (VOC) of 0.87 V, a short-circuit current density (JSC) of 15.06 mA cm−2, a fill factor (FF) of 70.4% and a high power conversion efficiency (PCE) of 9.22%. The PCE was higher than the polymers which have the same backbone structure but also have the 1D or 2D symmetric BDT unit. In addition, a PCE of 7.83% with a VOC of 0.91 V, a JSC of 13.62 mA cm−2, and an FF of 63.2% was obtained for PBDTTh–DTffBT/ITIC, which is also impressive for non-fullerene PSCs. The results indicate that our design strategy of introducing an alkylthienyl unit as side chain to fabricate asymmetric BDT-based polymer is efficient in improving the photovoltaic performance.
中文翻译：
炔基取代的不对称2D BDT和DTBT基聚合物太阳能电池，功率转换效率为9.2％†
在新型光收集聚合物的设计中，首次将烷基噻吩单元用作不对称苯并二噻吩（BDT）结构单元上的侧链取代基。一种基于烷基噻吩基不对称BDT和著名的4,7-二（噻吩-2-乙基己基）-5,6-二氟-2,1,3-的新型D-A型聚合物（PBDT Th -DT ff BT）通过钯催化的Stille偶联反应合成了苯并噻二唑（DT ff BT）。通过将PBDT Th –DT ff BT与PC 71 BM混合，可以制造出高效的块状异质结太阳能电池。经过优化的基于PBDT Th –DT ff BT的光伏器件具有开路电压（VOC）为0.87 V，短路电流密度（ J SC）为15.06 mA cm -2，填充系数（FF）为70.4％，高功率转换效率（PCE）为9.22％。PCE高于具有相同主链结构但也具有1D或2D对称BDT单元的聚合物。另外，7.83％以一个PCE V OC 0.91 V，一个的Ĵ SC的13.62毫安厘米-2为PBDT获得，和63.2％的FF钍-DT FFBT / ITIC，这对于非富勒烯PSC而言也令人印象深刻。结果表明，我们的设计策略是引入烷基噻吩单元作为侧链，以制备不对称的基于BDT的聚合物，这在提高光伏性能方面是有效的。
更新日期：2018-01-04
中文翻译：
炔基取代的不对称2D BDT和DTBT基聚合物太阳能电池，功率转换效率为9.2％†
在新型光收集聚合物的设计中，首次将烷基噻吩单元用作不对称苯并二噻吩（BDT）结构单元上的侧链取代基。一种基于烷基噻吩基不对称BDT和著名的4,7-二（噻吩-2-乙基己基）-5,6-二氟-2,1,3-的新型D-A型聚合物（PBDT Th -DT ff BT）通过钯催化的Stille偶联反应合成了苯并噻二唑（DT ff BT）。通过将PBDT Th –DT ff BT与PC 71 BM混合，可以制造出高效的块状异质结太阳能电池。经过优化的基于PBDT Th –DT ff BT的光伏器件具有开路电压（VOC）为0.87 V，短路电流密度（ J SC）为15.06 mA cm -2，填充系数（FF）为70.4％，高功率转换效率（PCE）为9.22％。PCE高于具有相同主链结构但也具有1D或2D对称BDT单元的聚合物。另外，7.83％以一个PCE V OC 0.91 V，一个的Ĵ SC的13.62毫安厘米-2为PBDT获得，和63.2％的FF钍-DT FFBT / ITIC，这对于非富勒烯PSC而言也令人印象深刻。结果表明，我们的设计策略是引入烷基噻吩单元作为侧链，以制备不对称的基于BDT的聚合物，这在提高光伏性能方面是有效的。
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