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Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels.
Small ( IF 13.3 ) Pub Date : 2020-04-03 , DOI: 10.1002/smll.202000441
Zhenghao Hu 1 , Linqiang Yang 2 , Wei Gao 3, 4 , Jinhua Gao 1 , Chunyu Xu 1 , Xiaoli Zhang 5 , Zhi Wang 1 , Weihua Tang 2 , Chuluo Yang 3, 4 , Fujun Zhang 1
Affiliation  

Efficient organic solar cells (OSCs) are fabricated using polymer PM6 as donor, and IPTBO-4Cl and MF1 as acceptors. The power conversion efficiency (PCE) of IPTBO-4Cl based and MF1 based binary OSCs individually arrive to 14.94% and 12.07%, exhibiting markedly different short circuit current density (JSC ) of 23.18 mA cm-2 versus 17.01 mA cm-2 , fill factor (FF) of 72.17% versus 78.18% and similar open circuit voltage (VOC ) of 0.893 V versus 0.908 V. The two acceptors, IPTBO-4Cl and MF1, have similar lowest unoccupied molecular orbital levels, which is beneficial for efficient electron transport in the ternary active layer. The PCE of optimized ternary OSCs arrives to 15.74% by incorporating 30 wt% MF1 in acceptors, resulting from the simultaneously increased JSC of 23.20 mA cm-2 , VOC of 0.897 V, and FF of 75.64% in comparison with IPTBO-4Cl based binary OSCs. The gradually increased FFs of ternary OSCs indicate the well-optimized phase separation and molecular arrangement with MF1 as morphology regulator. This work may provide a new viewpoint for selecting an appropriate third component to achieve efficient ternary OSCs from materials and photovoltaic parameters of two binary OSCs.

中文翻译:

通过使用两个具有相似LUMO水平的兼容受体,三元有机太阳能电池的效率超过15.7%。

使用聚合物PM6作为施主,IPTBO-4Cl和MF1作为受主来制造高效的有机太阳能电池(OSC)。基于IPTBO-4Cl和基于MF1的二进制OSC的功率转换效率(PCE)分别达到14.94%和12.07%,表现出23.18 mA cm-2与17.01 mA cm-2的显着不同的短路电流密度(JSC),填充系数(FF)为72.17%对78.18%,并且类似的开路电压(VOC)为0.893 V对0.908V。两个受主IPTBO-4Cl和MF1的最低未占据分子轨道水平相似,这有利于有效的电子传输在三元活性层中。通过将30 wt%的MF1掺入受体,优化的三元OSC的PCE达到15.74%,这是由于同时增加了23.20 mA cm-2的JSC,0.897 V的VOC和FF的75。与基于IPTBO-4Cl的二进制OSC相比,为64%。三元OSC的FF逐渐增加表明,以MF1作为形态调节剂,相分离和分子排列的优化程度很高。这项工作可以为从两个二元OSC的材料和光伏参数中选择合适的第三组分以实现有效的三元OSC提供新的观点。
更新日期:2020-04-03
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