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首页> 外文期刊>Advanced energy materials >Low-Temperature Processable High-Performance D–A-Type Random Copolymers for Nonfullerene Polymer Solar Cells and Application to Flexible Devices
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Low-Temperature Processable High-Performance D–A-Type Random Copolymers for Nonfullerene Polymer Solar Cells and Application to Flexible Devices

机译：非富勒烯聚合物太阳能电池的低温可加工高性能D–A型无规共聚物及其在柔性器件中的应用

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摘要

Donor-acceptor random copolymers incorporating 1,3-bis(thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c]dithiophene-4,8-dione (BDD) and 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b]dithiophene (BDT-Th) are developed. Nonfullerene solar cells introducing the random copolymer PBDB-T73 (BDT-Th:BDD=7:3) and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2,3-d]-s-indaceno[1,2-b:5,6-b]dithiophene are found to exhibit efficiency of 11.14%, which is superior to that of the PBDB-T alternating copolymer (10.02%). The PBDB-T73 device exhibits high performance due to low bimolecular charge recombination and good charge transport balance even though none of the treatments that are usually necessary for improving crystalline properties of active layers are performed; in contrast, the PBDB-T device requires thermal annealing in order to enhance the polymer's crystallinity and obtain improved fill factor and J(sc) values. It is demonstrated that efficient charge transport occurs in the PBDB-T73 blend despite relatively low crystallinity of the polymer. The percolating network structure of the large mixed phase in the PBDB-T73 blend has an important role in its efficient charge transport. Moreover, due to the low-temperature processability of PBDB-T73, flexible PBDB-T73 solar cell devices prepared on polyethylene terephthalate (PET) substrates exhibit high photovoltaic performance, 10.02%, whereas the efficiency of PBDB-T-based flexible devices (7.2%) is significantly lower due to damage to the active layer on indium tin oxide (ITO)/PET that results from thermal annealing.
机译：含1,3-双（噻吩-2-基）-5,7-双（2-乙基己基）苯并[1,2-c：4,5-c]二噻吩-4,8-​​二酮的供体-受体无规共聚物（BDD）和4,8-双（5-（2-（乙基乙基己基）噻吩-2-基）苯并[1,2-b：4,5-b]二噻吩（BDT-Th）被开发出来。引入无规共聚物PBDB-T73（BDT-Th：BDD = 7：3）和3,9-双（2-亚甲基-（3-（1,1-二氰基亚甲基）-茚满酮））-5,5的非富勒烯太阳能电池发现，11,11-四（4-己基苯基）-二噻吩并[2,3-d：2,3-d] -s-茚并[1,2-b：5,6-b]二噻吩显示出11.14％，优于PBDB-T交替共聚物（10.02％）。 PBDB-T73器件由于低的双分子电荷复合和良好的电荷传输平衡而表现出高性能，即使没有执行通常需要改善有源层晶体性能的任何处理；相反，PBDB-T装置需要进行热退火，以增强聚合物的结晶度并获得改善的填充系数和J（sc）值。已证明尽管聚合物的结晶度较低，但在PBDB-T73共混物中仍发生有效的电荷传输。 PBDB-T73共混物中大型混合相的渗透网络结构在其高效电荷传输中具有重要作用。此外，由于PBDB-T73的低温加工性能，在聚对苯二甲酸乙二醇酯（PET）基板上制备的柔性PBDB-T73太阳能电池器件显示出10.02％的高光伏性能，而基于PBDB-T的柔性器件的效率（7.2由于热退火对铟锡氧化物（ITO）/ PET上的活性层造成损坏，因此％）显着降低。

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