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Ternary All‐Small‐Molecule Solar Cells with Two Small‐Molecule Donors and Y6 Nonfullerene Acceptor with a Power Conversion Efficiency over Above 14% Processed from a Nonhalogenated Solvent
Solar RRL ( IF 6.0 ) Pub Date : 2020-09-01 , DOI: 10.1002/solr.202000460 Fernando G. Guijarro 1 , Rubén Caballero 1 , Pilar de la Cruz 1 , Rahul Singhal 2 , Fernando Langa 1 , Ganesh D. Sharma 3
Solar RRL ( IF 6.0 ) Pub Date : 2020-09-01 , DOI: 10.1002/solr.202000460 Fernando G. Guijarro 1 , Rubén Caballero 1 , Pilar de la Cruz 1 , Rahul Singhal 2 , Fernando Langa 1 , Ganesh D. Sharma 3
Affiliation
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An efficient organic solar cell (OSC) based on a ternary active layer consisting of two conjugated small‐molecule (SM) donors (FG3 and FG4) and a well‐known nonfullerene SM acceptor (Y6) is fabricated using a nonhalogenated solvent. An overall power conversion efficiency (PCE) of 14.31% is achieved, higher than that for the binary counterparts, i.e., 10.75% and 11.07% for FG3:Y6 and FG4:Y6, respectively. The short‐circuit current density (JSC) of the ternary active layer organ is related to the broader absorption spectra when compared with the binary active layers. The open‐circuit voltage (VOC) of the ternary active layer‐based OSCs falls between those of the OSCs based on FG3:Y6 and FG4:Y6, a situation that is consistent with the lowest unoccupied molecular orbital (LUMO) level of both SM donors (FG3 and FG4), and forms the alloy between the two donors. The overlap of the absorption spectra of FG4 with the photoluminescence of FG3 confirms the energy transfer from FG3 to FG4 and this leads to improvement in JSC. The balanced charge transport, reduced charge recombination, and the fast charge extraction in the ternary active layer leads to the higher fill factor (FF) value. A combination of all of these effects affords a high PCE value.
中文翻译：
用非卤代溶剂处理的具有两个小分子供体和Y6非富勒烯受体的三元全小分子太阳能电池，其功率转换效率超过14％
使用非卤代溶剂制造基于三元活性层的高效有机太阳能电池（OSC），该三元活性层包含两个共轭小分子（SM）供体（FG3和FG4）和一个众所周知的非富勒烯SM受体（Y6）。实现了14.31％的整体功率转换效率（PCE），高于二进制转换的效率，即FG3：Y6和FG4：Y6分别为10.75％和11.07％。与二元活性层相比，三元活性层器官的短路电流密度（J SC）与更宽的吸收光谱有关。开路电压（V基于三元活性层的OSC的OC）介于基于FG3：Y6和FG4：Y6的OSC之间，这种情况与两个SM供体（FG3和FG4）的最低空分子轨道（LUMO）最低水平一致，并在两个供体之间形成合金。FG4的吸收光谱与FG3的光致发光重叠，确认了从FG3到FG4的能量转移，这导致了J SC的改善。。平衡的电荷传输，减少的电荷复合以及三元活性层中的快速电荷提取导致较高的填充因子（FF）值。所有这些影响的组合提供了较高的PCE值。
更新日期：2020-11-06
中文翻译：
用非卤代溶剂处理的具有两个小分子供体和Y6非富勒烯受体的三元全小分子太阳能电池，其功率转换效率超过14％
使用非卤代溶剂制造基于三元活性层的高效有机太阳能电池（OSC），该三元活性层包含两个共轭小分子（SM）供体（FG3和FG4）和一个众所周知的非富勒烯SM受体（Y6）。实现了14.31％的整体功率转换效率（PCE），高于二进制转换的效率，即FG3：Y6和FG4：Y6分别为10.75％和11.07％。与二元活性层相比，三元活性层器官的短路电流密度（J SC）与更宽的吸收光谱有关。开路电压（V基于三元活性层的OSC的OC）介于基于FG3：Y6和FG4：Y6的OSC之间，这种情况与两个SM供体（FG3和FG4）的最低空分子轨道（LUMO）最低水平一致，并在两个供体之间形成合金。FG4的吸收光谱与FG3的光致发光重叠，确认了从FG3到FG4的能量转移，这导致了J SC的改善。。平衡的电荷传输，减少的电荷复合以及三元活性层中的快速电荷提取导致较高的填充因子（FF）值。所有这些影响的组合提供了较高的PCE值。
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