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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Unprecedented low energy losses in organic solar cells with high external quantum efficiencies by employing non-fullerene electron acceptors
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Unprecedented low energy losses in organic solar cells with high external quantum efficiencies by employing non-fullerene electron acceptors

机译：通过采用非富烯电子受体，具有高外部量子效率的有机太阳能电池的前所未有的低能量损失

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摘要

In order to realize high photocurrent generation in the low-energy region of the solar spectrum, two conjugated A-D-A oligomers, PY-1 and DCI-2 comprising a central dithieno[3,2-b:2',3'-d]pyrrole donor (D) unit and end-capping acceptors (A) 1-butyl-4-methyl-2,6-dioxopyridine-3-carbonitrile (PY) or 3-dicyanomethyleneindan-1-one (DCI) have been synthesized and characterized. The oligomers showed strong absorptions in the red and near-IR region in solution and in the solid state. As a consequence of the strong electron-accepting character, the absorption band of DCI-2 in thin films is significantly red-shifted compared to that of PY-1 resulting in a low optical energy gap of 1.23 eV. In optimized solution-processed bulk-heterojunction solar cells using a polymeric donor P1, the new non-fullerene acceptor DCI-2 provides an excellent power conversion efficiency of 6.94% which is noticeably higher than that of PY-1-based devices (PCE = 4.89%). Most importantly, a high open-circuit voltage (V-OC) of similar to 0.8 V with unprecedented energy losses, between the optical energy gap and the open-circuit voltage, between 0.39 and 0.43 eV concomitant with excellent external quantum efficiencies of 69%@880 nm in the NIR-regime have been achieved for DCI-2-based devices.
机译：为了在太阳光谱的低能量区域中实现高光电流，两个共轭ADA低聚物，PY-1和DCI-2，包括中央二烯诺[3,2-B：2'，3'-D]吡咯供体（D）单位和封端受体（A）1-丁基-4-甲基-2,6-二氧吡啶-3-腈（PY）或3-二氰基甲基茚满-1-一种（DCI）已经合成并表征。低聚物在溶液中的红色和近红外区域和固态显示出强烈吸收。由于强电子接受特征的结果，与Py-1相比，薄膜中DCI-2的吸收带显着变红，导致1.23eV的低光学能隙。在使用聚合物供体P1的优化溶液加工的散装杂交太阳能电池中，新的非富勒烯受体DCI-2提供了优异的功率转换效率为6.94％，其明显高于基于Py-1的器件（PCE = 4.89％）。最重要的是，在光学能隙和开路电压之间具有前所未有的能量损失的高开路电压（V-OC），光能间隙与开路电压之间的延伸率为0.39和0.43eV伴随着69％的优异外部量子效率已经为基于DCI-2的设备实现了NIR-SEGIME中的880nm。

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