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氟化和热退火对聚合物本体异质结太阳能电池中电荷复合过程的影响。

Effects of fluorination and thermal annealing on charge recombination processes in polymer bulk-heterojunction solar cells.

作者信息

Más-Montoya Miriam, Li Junyu, Wienk Martijn M, Meskers Stefan C J, Janssen René A J

机构信息

Molecular Materials and Nanosystems , Institute for Complex Molecular Systems , Eindhoven University of Technology , P.O. Box 513 , 5600 MB Eindhoven , The Netherlands.

DSM DMSC R&D Solutions , P.O. Box 18 , 6160 MD Geleen , The Netherlands.

出版信息

J Mater Chem A Mater. 2018 Oct 28;6(40):19520-19531. doi: 10.1039/c8ta03031f. Epub 2018 Oct 2.

DOI:10.1039/c8ta03031f
PMID:30713689
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6333271/
Abstract

We investigate the effect of fluorination on the photovoltaic properties of an alternating conjugated polymer composed of 4,8-di-2-thienylbenzo[1,2-:4,5-']dithiophene (BDT) and 4,7-bis([2,2'-bithiophen]-5-yl)-benzo-2-1-3-thiadiazole (4TBT) units in bulk-heterojunction solar cells. The unsubstituted and fluorinated polymers afford very similar open-circuit voltages and fill factor values, but the fluorinated polymer performed better due to enhanced aggregation which provides a higher photocurrent. The photovoltaic performance of both materials improved upon thermal annealing at 150-200 °C as a result of a significantly increased fill factor and open-circuit voltage, counteracted by a slight loss in photocurrent. Detailed studies of the morphology, light intensity dependence, external quantum efficiency and electroluminescence allowed the exploration of the effects of fluorination and thermal annealing on the charge recombination and the nature of the donor-acceptor interfacial charge transfer states in these films.

摘要

我们研究了氟化对由4,8-二-2-噻吩基苯并[1,2-:4,5-']二噻吩（BDT）和4,7-双（[2,2'-联噻吩]-5-基）-苯并-2-1-3-噻二唑（4TBT）单元组成的交替共轭聚合物在体异质结太阳能电池中的光伏性能的影响。未取代和氟化的聚合物提供了非常相似的开路电压和填充因子值，但由于增强的聚集提供了更高的光电流，氟化聚合物表现更好。两种材料在150 - 200°C热退火后光伏性能均有所改善，这是由于填充因子和开路电压显著增加，不过光电流略有损失。对形态、光强依赖性、外量子效率和电致发光的详细研究使得能够探究氟化和热退火对这些薄膜中电荷复合以及供体 - 受体界面电荷转移态性质的影响。

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