材料科学
光伏系统
有机太阳能电池
能量转换效率
聚合物太阳能电池
光电子学
接受者
太阳能电池
轨道能级差
开路电压
载流子
电荷(物理)
电子受体
活动层
量子效率
光电流
带隙
噻吩
有机半导体
太阳能
作者
Zhuohan Zhang,Linqiang Yang,Zhenghao Hu,Jiangsheng Yu,Xin Liu,Hongtao Wang,Jinru Cao,Fujun Zhang,Weihua Tang
出处
期刊:Materials Chemistry Frontiers
[The Royal Society of Chemistry]
日期:2020-06-04
卷期号:4 (6): 1747-1755
被引量:11
摘要
Charge density modulation on a thieno[2′′,3′′:5′,6′]-s-indaceno[2′,1′:4,5]dithieno[3,2-b:2′,3′-d]pyrrole (IPT) core has been conducted for a systematic study of its impact on the electronic structure, molecular packing and photovoltaic performance of asymmetric fused-ring acceptors (FRAs). Herein, a series of IPT-based FRAs (i.e.IN-4F, INO-4F, IPT-4F and IPCl-4F) are designed by incorporating 2-ethylhexyl, 2-ethylhexyloxy, hydrogen and chloro side chains, respectively, onto the IPT core. Enhancing the electron-withdrawing ability of the side-chains decreases the optical bandgap but lowers the lowest unoccupied molecular orbital (LUMO) level, which yields a trade-off between JSC and VOC in organic solar cells (OSCs). Furthermore, the FRAs exhibit tunable miscibility and crystallinity, reflected in the FF and JSC values of the OSCs. By pairing with polymer donor PM6, IPT-4F based devices achieve the highest PCE of 14.62% with a balanced VOC of 0.88 V and JSC of 22.15 mA cm−2 and a high FF of 75.01%. Our research demonstrates that electronic density modulation on asymmetric FRAs is an effective way to systematically optimize the device parameters in pursuit of high performance OSCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI