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Phthalimide-Based Wide Bandgap Donor Polymers for Efficient Non-Fullerene Solar Cells
Macromolecules ( IF 5.1 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acs.macromol.7b01958 Jianwei Yu 1, 2 , Jie Yang 1 , Xin Zhou 1 , Simiao Yu 2 , Yumin Tang 1 , Hang Wang 1, 2 , Jianhua Chen 1 , Shiming Zhang 2 , Xugang Guo 1
Macromolecules ( IF 5.1 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acs.macromol.7b01958 Jianwei Yu 1, 2 , Jie Yang 1 , Xin Zhou 1 , Simiao Yu 2 , Yumin Tang 1 , Hang Wang 1, 2 , Jianhua Chen 1 , Shiming Zhang 2 , Xugang Guo 1
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Organic solar cells (OSCs) have achieved rapid progress, recently, due to the breakthrough of using fused-ring electron acceptors (FREAs), which show broad absorption and narrow bandgap compared to fullerene derivatives. To further improve the device performance of OSCs, it is highly desired to develop suitable donor polymers which feature complementary absorption and favorable energy levels to match the non-fullerene acceptors. We report here the synthesis of two phthalimide-based wide bandgap polymers TPhI-BDT and TffPhI-DBT. The TffPhI-BDT is based on a new electron acceptor unit, difluorophthalimide (ffPhI). The fluorine addition leads to TffPhI-DBT with comparable absorption but lower-lying frontier molecular orbitals versus the non-fluorinated analogue TPhI-BDT. When incorporated into non-fullerene OSCs, polymer TPhI-BDT shows a PCE of 8.31% with a Voc of 0.90 V, a Jsc of 14.07 mA cm–2, and a FF of 66.0%. The fluorine-containing analogue polymer TffPhI-BDT exhibits an improved PCE of 9.48% with a larger Voc of 0.93 V, a Jsc of 15.92 mA cm–2, and a FF of 63.9%. The performance improvement of TffPhI-BDT is mainly attributed to its lower-lying FMOs and improved charge transport characteristics. The results demonstrate that phthalimides are highly promising building blocks for enabling wide bandgap polymers, and fluorine addition leads to polymer TffPhI-DBT with further optimized electrical properties for applications in non-fullerene solar cells.
中文翻译：
用于高效非富勒烯太阳能电池的基于邻苯二甲酰亚胺的宽带隙给体聚合物
最近，由于使用稠环电子受体（FREA）的突破，有机太阳能电池（OSC）取得了飞速发展，与富勒烯衍生物相比，该技术显示出宽的吸收和窄的带隙。为了进一步改善OSC的装置性能，非常需要开发合适的供体聚合物，其特征在于互补的吸收和有利的能级以匹配非富勒烯受体。我们在这里报告了两种邻苯二甲酰亚胺基宽带隙聚合物TPhI-BDT和TffPhI-DBT的合成。TffPhI-BDT基于新的电子受体单元二氟邻苯二甲酰亚胺（ffPhI）。与未氟化的类似物TPhI-BDT相比，氟的添加导致TffPhI-DBT具有相当的吸收率，但前沿分子轨道较低。当掺入非富勒烯OSC中时，聚合物TPhI-BDT的PCE为8。V oc为0.90 V，J sc为14.07 mA cm –2，且FF为66.0％。含氟类似物聚合物TffPhI-BDT的PCE改善了9.48％，更大的V oc为0.93 V，J sc为15.92 mA cm -2，并且FF为63.9％。TffPhI-BDT的性能提高主要归因于其较低的FMO和改进的电荷传输特性。结果表明，邻苯二甲酰亚胺是实现宽带隙聚合物的高度有前途的基石，氟的添加导致聚合物TffPhI-DBT具有进一步优化的电性能，可用于非富勒烯太阳能电池。
更新日期：2017-11-08
中文翻译：
用于高效非富勒烯太阳能电池的基于邻苯二甲酰亚胺的宽带隙给体聚合物
最近，由于使用稠环电子受体（FREA）的突破，有机太阳能电池（OSC）取得了飞速发展，与富勒烯衍生物相比，该技术显示出宽的吸收和窄的带隙。为了进一步改善OSC的装置性能，非常需要开发合适的供体聚合物，其特征在于互补的吸收和有利的能级以匹配非富勒烯受体。我们在这里报告了两种邻苯二甲酰亚胺基宽带隙聚合物TPhI-BDT和TffPhI-DBT的合成。TffPhI-BDT基于新的电子受体单元二氟邻苯二甲酰亚胺（ffPhI）。与未氟化的类似物TPhI-BDT相比，氟的添加导致TffPhI-DBT具有相当的吸收率，但前沿分子轨道较低。当掺入非富勒烯OSC中时，聚合物TPhI-BDT的PCE为8。V oc为0.90 V，J sc为14.07 mA cm –2，且FF为66.0％。含氟类似物聚合物TffPhI-BDT的PCE改善了9.48％，更大的V oc为0.93 V，J sc为15.92 mA cm -2，并且FF为63.9％。TffPhI-BDT的性能提高主要归因于其较低的FMO和改进的电荷传输特性。结果表明，邻苯二甲酰亚胺是实现宽带隙聚合物的高度有前途的基石，氟的添加导致聚合物TffPhI-DBT具有进一步优化的电性能，可用于非富勒烯太阳能电池。
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