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A difluorobenzothiadiazole-based conjugated polymer with alkylthiophene as the side chains for efficient, additive-free and thick-film polymer solar cells
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2017-09-05 00:00:00 , DOI: 10.1039/c7ta06332f Mu He 1, 2, 3, 4, 5 , Miaomiao Li 5, 6, 7, 8, 9 , Xin Dong 1, 2, 3, 4, 5 , Hongkun Tian 1, 2, 3, 4, 5 , Hui Tong 1, 2, 3, 4, 5 , Jun Liu 1, 2, 3, 4, 5 , Zhiyuan Xie 1, 2, 3, 4, 5 , Yanhou Geng 1, 2, 3, 4, 5 , Fosong Wang 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2017-09-05 00:00:00 , DOI: 10.1039/c7ta06332f Mu He 1, 2, 3, 4, 5 , Miaomiao Li 5, 6, 7, 8, 9 , Xin Dong 1, 2, 3, 4, 5 , Hongkun Tian 1, 2, 3, 4, 5 , Hui Tong 1, 2, 3, 4, 5 , Jun Liu 1, 2, 3, 4, 5 , Zhiyuan Xie 1, 2, 3, 4, 5 , Yanhou Geng 1, 2, 3, 4, 5 , Fosong Wang 1, 2, 3, 4, 5
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Two donor–acceptor (D–A) conjugated polymers with alkylthiophene as side chains, i.e., poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3′′′-di(2-(2-decyltetradecyl)thiophene-5-yl)-2,2′;5′,2′′;5′′,2′′′-quaterthiophene-5,5′′′-diyl)] (P-2T) and poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(2,5-bis(3-(2-decyltetradecyl)thiophene-5-yl)thiophen-2-yl)thieno[3,2-b]thiophene] (P-TT), are designed and synthesized. Both polymers exhibit temperature-sensitive aggregation in solution. Polymer solar cells (PSCs) based on them are fabricated with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor material. The devices based on P-TT deliver power conversion efficiency (PCE) up to 9.96% while no additive is used. Moreover, the photovoltaic performance of P-TT is insensitive to the polymer:PC71BM ratio and active layer thickness, and PCEs are all above 9% with the donor
:acceptor (D:A) weight ratio of 1:1–1:1.8 (wt/wt) and film thickness of 200–360 nm. The high photovoltaic performance of P-TT is ascribed to its high and balanced charge carrier mobilities (4.51 × 10−3 and 3.44 × 10−3 cm2 V−1 s−1 for holes and electrons, respectively), owing to the favorable face-on packing of the conjugated backbones as well as the desired morphology of the blend films. Our study demonstrates that alkylthiophenes are one kind of promising synthon of oligothiophene based D–A conjugated polymers, which can serve as side chains for tuning the aggregation of the polymer in solution and the packing mode of the conjugated backbones in the film state.
中文翻译：
以烷基噻吩为侧链的基于二氟苯并噻二唑的共轭聚合物，用于高效，无添加剂和厚膜聚合物太阳能电池
两个带有烷基噻吩作为侧链的供体-受体（DA）共轭聚合物，即聚[（5,6-二氟-2,1,3-苯并噻二唑-4,7-二基）-alt-（3,3' ′′-二（2-（2-（2-癸基十四烷基）噻吩-5-基）-2,2′; 5′，2′′; 5′′，2′′′-季噻吩-5,5′′′-二基）]（P-2T）和聚[（5,6-二氟-2,1,3-苯并噻二唑-4,7-二基）-alt-（2,5-双（3-（2-癸基十四烷基）噻吩-设计并合成了5-基）噻吩-2-基）噻吩并[3,2- b ]噻吩[ P-TT ] 。两种聚合物在溶液中均表现出对温度敏感的聚集。用[6,6]-苯基-C 71-丁酸甲酯（PC 71）制造基于它们的聚合物太阳能电池（PSC）BM）作为受体材料。基于P-TT的设备可提供高达9.96％的功率转换效率（PCE），而无需使用任何添加剂。此外，所述光伏性能P-TT是不敏感的聚合物：PC 71 BM比和活性层的厚度，和的PCE都与供体9％以上：受体（d ：A）重量比为1 ：1-1 ：1.8（wt / wt）和200–360 nm的膜厚度。P-TT的高光伏性能归因于其高且平衡的载流子迁移率（4.51×10 -3和3.44×10 -3 cm 2 V -1 s空穴和电子分别为-1），这是由于共轭主链的良好面对面堆积以及所需的共混薄膜形态。我们的研究表明，烷基噻吩是一种基于寡聚噻吩的D–A共轭聚合物的有前途的合成子，可作为侧链调节溶液中聚合物的聚集以及薄膜状态下共轭主链的堆积方式。
更新日期：2017-09-21
:acceptor (D:A) weight ratio of 1:1–1:1.8 (wt/wt) and film thickness of 200–360 nm. The high photovoltaic performance of P-TT is ascribed to its high and balanced charge carrier mobilities (4.51 × 10−3 and 3.44 × 10−3 cm2 V−1 s−1 for holes and electrons, respectively), owing to the favorable face-on packing of the conjugated backbones as well as the desired morphology of the blend films. Our study demonstrates that alkylthiophenes are one kind of promising synthon of oligothiophene based D–A conjugated polymers, which can serve as side chains for tuning the aggregation of the polymer in solution and the packing mode of the conjugated backbones in the film state.
中文翻译：
以烷基噻吩为侧链的基于二氟苯并噻二唑的共轭聚合物，用于高效，无添加剂和厚膜聚合物太阳能电池
两个带有烷基噻吩作为侧链的供体-受体（DA）共轭聚合物，即聚[（5,6-二氟-2,1,3-苯并噻二唑-4,7-二基）-alt-（3,3' ′′-二（2-（2-（2-癸基十四烷基）噻吩-5-基）-2,2′; 5′，2′′; 5′′，2′′′-季噻吩-5,5′′′-二基）]（P-2T）和聚[（5,6-二氟-2,1,3-苯并噻二唑-4,7-二基）-alt-（2,5-双（3-（2-癸基十四烷基）噻吩-设计并合成了5-基）噻吩-2-基）噻吩并[3,2- b ]噻吩[ P-TT ] 。两种聚合物在溶液中均表现出对温度敏感的聚集。用[6,6]-苯基-C 71-丁酸甲酯（PC 71）制造基于它们的聚合物太阳能电池（PSC）BM）作为受体材料。基于P-TT的设备可提供高达9.96％的功率转换效率（PCE），而无需使用任何添加剂。此外，所述光伏性能P-TT是不敏感的聚合物：PC 71 BM比和活性层的厚度，和的PCE都与供体9％以上
：受体（d ：A）重量比为1 ：1-1 ：1.8（wt / wt）和200–360 nm的膜厚度。P-TT的高光伏性能归因于其高且平衡的载流子迁移率（4.51×10 -3和3.44×10 -3 cm 2 V -1 s空穴和电子分别为-1），这是由于共轭主链的良好面对面堆积以及所需的共混薄膜形态。我们的研究表明，烷基噻吩是一种基于寡聚噻吩的D–A共轭聚合物的有前途的合成子，可作为侧链调节溶液中聚合物的聚集以及薄膜状态下共轭主链的堆积方式。
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