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Bis(carboxylate) substituted benzodithiophene based wide-bandgap polymers for high performance nonfullerene polymer solar cells
Dyes and Pigments ( IF 4.1 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.dyepig.2018.09.079
Dan Hao , Miao Li , Yahui Liu , Cuihong Li , Zhishan Bo

To develop wide bandgap donor materials for high performance nonfullerene polymer solar cells (NF PSCs), bis(carboxylate) substituted benzo[1,2-b:4,5-b]dithiophene (BDT) weak electron acceptor (A) unit was used to polymerize with 5-alkylthiophene-2-yl-substituted BDT or 5-alkylthiothiophene-2-yl-substituted BDT donor unit to construct donor-acceptor (D-A) alternative polymers PBDT-BDTC and PBDTS-BDTC, respectively. PBDT-BDTC and PBDTS-BDTC exhibit wide bandgaps over 1.90 eV and low lying highest occupied molecular orbital (HOMO) levels below −5.50 eV. The absorption and energy levels of these two polymers match well with those of the typical low bandgap acceptor ITIC-Th, resulting in a good complementary absorption from 300 to 900 nm and a low HOMO level offset of about 0.15 eV. NF PSCs with an inverted device structure were fabricated and power conversion efficiencies (PCEs) higher than 7% were achieve. Furthermore, PBDT-BDTC based PSCs exhibit much better photovoltaic performance than PBDTS-BDTC based ones after the treatment with 0.5% 1,8-diiodooctane (DIO). The optimized devices gave a PCE of 8.32% with an open-circuit voltage (Voc) of 0.92 V, a short-circuit current density (Jsc) of 13.91 mA/cm2, and a fill factor (FF) of 65.21%, indicating that PBDT-BDTC is a promising polymer donor for NF PSCs. To the best of our knowledge, a PCE of 8.32% is the highest record for bis(carboxylate) substituted BDT based polymers.



中文翻译:

用于高性能非富勒烯聚合物太阳能电池的双(羧酸盐)取代的苯并二噻吩基宽带隙聚合物

为了开发用于高性能非富勒烯聚合物太阳能电池(NF PSC)的宽带隙供体材料,使用了双(羧酸盐)取代的苯并[1,2-b:4,5-b]二噻吩(BDT)弱电子受体(A)单元与5-烷基噻吩-2-基取代的BDT或5-烷基噻吩-2-基取代的BDT供体单元聚合,以分别构建供体-受体(DA)替代聚合物PBDT-BDTCPBDTS-BDTCPBDT-BDTCPBDTS-BDTC表现出超过1.90 eV的宽带隙和低于-5.50 eV的低位最高占据分子轨道(HOMO)水平。这两种聚合物的吸收和能级与典型的低带隙受体ITIC-Th的吸收和能级非常匹配,导致300至900 nm的良好互补吸收和低至约0.15 eV的HOMO能级偏移。制作了具有反向器件结构的NF PSC,并实现了高于7%的功率转换效率(PCE)。此外,PBDT-BDTC基于的PSC表现出比好得多光伏性能PBDTS-BDTC用0.5%1,8-二碘辛烷(DIO)在处理后基于那些。经过优化的器件的PCE为8.32%,开路电压(V oc)为0.92 V,短路电流密度为(J sc)为13.91 mA / cm 2,填充因子(FF)为65.21%,表明PBDT-BDTC是有希望的NF PSC聚合物供体。据我们所知,PCE为8.32%,是双(羧酸盐)取代的BDT基聚合物的最高记录。

更新日期:2018-10-01
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