Enhancing performance of non-fullerene organic solar cells via side chain engineering of fused-ring electron acceptors
Enhancing performance of non-fullerene organic solar cells via side chain engineering of fused-ring electron acceptors
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DOI：
10.1016/j.dyepig.2016.12.065
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发表时间：
2017-04
影响因子：
4.5
通讯作者：
Cenqi Yan;Yang Wu;Jiayu Wang;Rong Li;Pei Cheng;Huitao Bai;Zhiqiang Zhan;Wei Ma;X. Zhan
中科院分区：
文献类型：
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作者：
Cenqi Yan;Yang Wu;Jiayu Wang;Rong Li;Pei Cheng;Huitao Bai;Zhiqiang Zhan;Wei Ma;X. Zhan
设计、合成了一系列以茚并二噻吩为核、2-（3-氧代-2，3-二氢茚-1-亚基）丙二腈为端基、噻吩为π桥的稠环电子受体，并将其应用于非富勒烯有机太阳能电池（OSC）。系统地研究了烷基侧链对吸收、能级、分子堆积、畴尺寸、畴纯度、电荷传输和光伏性能的影响，发现侧链碳数的增加会产生空间位阻效应，使HOMO能级略有降低，LUMO能级升高，从而使开路电压从0.84 V逐渐升高到0.95 V。短路电流、填充因子和效率随烷基链上脂肪碳数的变化呈非单调变化，当碳数为6时，短路电流、填充因子和效率同时达到最大值。
A series of fused-ring electron acceptors with indacenodithiophene as core, 2-(3-oxo-2,3-dihydroinden-1-ylidene) malononitrile as end groups, thiophene with different side chains as π bridge are designed, synthesized and applied in non-fullerene organic solar cells (OSCs). The effects of alkyl side chains on absorption, energy level, molecular packing, domain size, domain purity, charge transport and photovoltaic performance are systematically investigated.Viathe steric hindrance effect, increase in carbon number of side chains slightly downshifts HOMO energy levels, upshifts LUMO energy levels and thereby increases open circuit voltage from 0.84 to 0.95 V gradually. Short circuit current, fill factor and efficiency vary non-monotonically with aliphatic carbon number of alkyl chains and reach maximum value simultaneously when carbon number is six.