• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Subtle Polymer Donor and Molecular Acceptor Design Enable Efficient Polymer Solar Cells with a Very Small Energy Loss
【24h】

Subtle Polymer Donor and Molecular Acceptor Design Enable Efficient Polymer Solar Cells with a Very Small Energy Loss

机译：精巧的聚合物供体和分子受体设计使高效聚合物太阳能电池的能量损失非常小

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new wide bandgap polymer donor, PNDT-ST, based on naphtho[2,3-b:6,7-b ']dithiophene (NDT) and 1,3-bis(thiophen-2-yl)-5,7-bis(2- ethylhexyl)benzo[1,2-c:4,5-c ']dithiophene-4,8-dione (BDD) is developed for efficient nonfullerene polymer solar cells. To better match the energy levels, a new near infrared small molecule of Y6-T is also developed. The extended pi-conjugation and less twist of PNDT-ST provides it with higher crystallinity and stronger aggregation than the PBDT-ST counterpart. The higher lowest occupied molecular orbital level of Y6-T than Y6 favors the better energy level match with these polymers, resulting in improved open circuit voltage (V-oc) and power conversion efficiency (PCE). The high crystallinity and strong aggregation of PNDT-ST also induces large phase separation with poorer morphology, leading to lower fill factor and reduced PCE than PBDT-ST. To mediate the crystallinity and optimize the morphology, PNDT-ST and PBDT-ST are blended together with Y6-T, forming the ternary blend devices. As expected, the two compatible polymers allow continual optimization of the morphology by varying the blend ratio. The optimized ternary blend devices deliver a champion PCE as high as 16.57% with a very small energy loss (E-loss) of 0.521 eV. Such small E-loss is the best record for polymer solar cells with PCEs over 16% to date.
机译：一种新型的带隙聚合物供体PNDT-ST，基于萘并[2,3-b：6,7-b']二噻吩（NDT）和1,3-双（噻吩-2-基）-5,7-双（2-乙基己基）苯并[1,2-c：4,5-c']二噻吩-4,8-​​二酮（BDD）被开发用于有效的富勒烯聚合物太阳能电池。为了更好地匹配能级，还开发了一种新的近红外小分子Y6-T。与PBDT-ST相比，PNDT-ST的扩展pi共轭和更少的扭曲使其具有更高的结晶度和更强的聚集性。 Y6-T的最低最低占据分子轨道能级比Y6高，有利于与这些聚合物的能级匹配，从而提高了开路电压（V-oc）和功率转换效率（PCE）。 PNDT-ST的高结晶度和强聚集性也诱导了较大的相分离，且形态较差，与PBDT-ST相比，导致较低的填充系数和较低的PCE。为了介导结晶度和优化形态，将PNDT-ST和PBDT-ST与Y6-T混合在一起，形成三元混合装置。如所期望的，两种相容的聚合物通过改变共混比来允许形态的连续优化。经过优化的三元混合器件可提供高达16.57％的PCE冠军称，而能量损耗（E损耗）仅为0.521 eV，非常小。迄今为止，如此低的E损耗是PCE超过16％的聚合物太阳能电池的最佳记录。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号