Efficient Nonfullerene Polymer Solar Cells Enabled by Small‐Molecular Acceptors with a Decreased Fused‐Ring Core,Small Methods

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Efficient Nonfullerene Polymer Solar Cells Enabled by Small‐Molecular Acceptors with a Decreased Fused‐Ring Core
Small Methods ( IF 10.7 ) Pub Date : 2018-03-25 , DOI: 10.1002/smtd.201700373
Weiyun Bai ₁ , Xiaopeng Xu ₁ , Qingya Li ₁ , Yunxiang Xu ₁ , Qiang Peng ₁

Affiliation

Two A1‐A2‐π‐D‐A2‐A1 structural small‐molecular acceptors with a decreased fused‐ring core, TIDT‐BT‐R2 and TIDT‐BT‐R6, are designed and synthesized by using thiophene‐indenothiophene (TIDT) as the core unit and benzothiadiazole‐rhodanine (BT‐R) as the end groups. The resulting small‐molecular acceptors exhibit the desirably complementary absorptions and well matched energy levels with the low‐bandgap donor copolymer of PTB7‐Th. Compared to TIDT‐BT‐R6, TIDT‐BT‐R2 with shorter side chains exhibits better crystallinity and higher charge carrier mobilities in its blend films. The nonfullerene solar cells (NFSCs) based on TIDT‐BT‐R2 also show higher exciton dissociation efficiency and lower charge recombination, which leads to higher J_sc and fill factor values. As a result, TIDT‐BT‐R2‐based NFSCs show a large V_oc of 1.04 V and a high power conversion efficiency of 8.7% with a very low energy loss of 0.55 eV, which is one of the best values for PTB7‐Th‐based binary blend devices.

中文翻译：

小分子受体使熔融环核减少，从而实现了高效的非富勒烯聚合物太阳能电池

使用噻吩-茚并噻吩（TIDT）设计并合成了两个具有减少的稠合环核的A1-A2-π-D-A2-A1结构小分子受体TIDT-BT-R2和TIDT-BT-R6核心单元和苯并噻二唑-罗丹宁（BT-R）作为末端基团。所得的小分子受体与PTB7-Th的低带隙供体共聚物表现出理想的互补吸收和良好的能级匹配。与TIDT-BT-R6相比，具有较短侧链的TIDT-BT-R2在其共混膜中具有更好的结晶度和更高的载流子迁移率。基于TIDT‐BT‐R2的非富勒烯太阳能电池（NFSC）还显示出更高的激子解离效率和更低的电荷重组，从而导致更高的J _sc和填充因子值。结果，基于TIDT-BT-R2的NFSC显示出1.04 V的大V _oc和8.7％的高功率转换效率，以及0.55 eV的极低能量损耗，这是PTB7-Th的最佳值之一基于二进制的混合设备。

更新日期：2018-03-25

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