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Low Energy Gap Triphenylamine–Heteropentacene–Dicyanovinyl Triad for Solution-Processed Bulk-Heterojunction Solar Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-05-07 00:00:00 , DOI: 10.1021/acs.jpcc.8b02348 Amaresh Mishra 1, 2, 3 , Christoph Wetzel 1 , Rahul Singhal 4 , Peter Bäuerle 1 , Ganesh D. Sharma 5
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-05-07 00:00:00 , DOI: 10.1021/acs.jpcc.8b02348 Amaresh Mishra 1, 2, 3 , Christoph Wetzel 1 , Rahul Singhal 4 , Peter Bäuerle 1 , Ganesh D. Sharma 5
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A low bandgap D–D–A (D = donor; A = acceptor) type conjugated molecular triad TPA-SN5-DCV has been implemented in solution-processed organic solar cells using PC71BM as acceptor. The molecule showed a narrow optical energy gap of 1.59 eV, and a broad absorption spectrum ranging from 350 to 750 nm. Cyclic voltammetry measurements were used to estimate the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels and are −5.10 and −3.53 eV, respectively. After the optimization of the donor and acceptor (PC71BM) weight ratio, the device based on as cast TPA-SN5-DCV:PC71BM (1:2) active layer exhibited overall PCE of 3.34%, which was improved to 6.31% using 0.3 vol % 1,8-diiodooctane (DIO) as solvent additive (SA). Further optimization of the DIO-treated active layer via thermal annealing (TA) resulted in a markedly improved PCE of 7.26%. The enhancement in PCE after either SA or SA + TA treatment is largely accredited to the increase in both JSC and FF, which is associated with the superior nanoscale morphology, broadening of absorption, and balanced charge transport.
中文翻译：
用于溶液处理的本体-异质结太阳能电池的低能隙三苯胺-杂戊并四烯-二氰基乙烯基三合体
一种低带隙的D–D–A（D =供体； A =受体）型共轭分子三合体TPA-SN5-DCV已在以PC 71 BM为受体的溶液处理有机太阳能电池中实现。该分子显示出1.59 eV的窄光能隙，以及350至750 nm的宽吸收光谱。循环伏安法测量被用于估计最高占据的分子轨道和最低的未占据的分子轨道能级，分别为-5.10和-3.53 eV。优化供体和受体（PC 71 BM）重量比后，该设备基于铸造的TPA-SN5-DCV：PC 71BM（1：2）活性层的总PCE为3.34％，使用0.3体积％的1,8-二碘辛烷（DIO）作为溶剂添加剂（SA）可以将其提高到6.31％。通过热退火（TA）对DIO处理的活性层进行进一步优化，可显着提高PCE达7.26％。SA或SA + TA处理后PCE的增强很大程度上归因于J SC和FF的增加，这与优异的纳米级形态，吸收范围扩大和平衡的电荷传输有关。
更新日期：2018-05-07
中文翻译：
用于溶液处理的本体-异质结太阳能电池的低能隙三苯胺-杂戊并四烯-二氰基乙烯基三合体
一种低带隙的D–D–A（D =供体； A =受体）型共轭分子三合体TPA-SN5-DCV已在以PC 71 BM为受体的溶液处理有机太阳能电池中实现。该分子显示出1.59 eV的窄光能隙，以及350至750 nm的宽吸收光谱。循环伏安法测量被用于估计最高占据的分子轨道和最低的未占据的分子轨道能级，分别为-5.10和-3.53 eV。优化供体和受体（PC 71 BM）重量比后，该设备基于铸造的TPA-SN5-DCV：PC 71BM（1：2）活性层的总PCE为3.34％，使用0.3体积％的1,8-二碘辛烷（DIO）作为溶剂添加剂（SA）可以将其提高到6.31％。通过热退火（TA）对DIO处理的活性层进行进一步优化，可显着提高PCE达7.26％。SA或SA + TA处理后PCE的增强很大程度上归因于J SC和FF的增加，这与优异的纳米级形态，吸收范围扩大和平衡的电荷传输有关。
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