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用于提高聚合物太阳能电池性能的基于区域规整交替二酮吡咯并吡咯的D-A-D-A三元共聚物。

Regio-regular alternating diketopyrrolopyrrole-based D-A-D-A terpolymers for the enhanced performance of polymer solar cells.

作者信息

Lee Myeongjae, Kim Taehyo, Nguyen Hoai Van T, Cho Hye Won, Lee Kyung-Koo, Choi Jong-Ho, Kim BongSoo, Kim Jin Young

机构信息

Department of Chemistry, Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea.

Green Materials and Processes Group, Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea.

出版信息

RSC Adv. 2019 Dec 18;9(72):42096-42109. doi: 10.1039/c9ra08858j.

DOI:10.1039/c9ra08858j
PMID:35542833
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9076513/
Abstract

We designed and synthesized regio-regular alternating diketopyrrolopyrrole (DPP)-based D-A-D-A terpolymers (PDPPF2T2DPP-T2, PDPPF2T2DPP-TVT, and PDPPF2T2DPP-DTT) using a primary donor (D) [3,3'-difluoro-2,2'-bithiophene (F2T2)] and a secondary donor (D) [2,2'-bithiophene (T2), ()-1,2-di(thiophen-2-yl)ethene (TVT), or dithieno[3,2-:2',3'-]thiophene (DTT)]. A PDPP2DT-F2T2 D-A polymer was synthesized as well to compare optical, electronic, and photovoltaic properties. The absorption peaks of the terpolymers (PDPPF2T2DPP-T2, PDPPF2T2DPP-TVT, and PDPPF2T2DPP-DTT) were longer ( = 801-810 nm) than the peak of the PDPP2DT-F2T2 polymer ( = 799 nm), which is associated with the high-lying HOMO levels of the terpolymers (-5.08 to -5.13 eV) compared with the level of the PDPP2DT-F2T2 polymer (-5.38 eV). The photovoltaic properties of these DPP-based polymers were investigated under simulated AM 1.5G sunlight (100 mW cm) with a conventional structure (ITO/PEDOT:PSS/polymer:PCBM/Al). The open-circuit voltages ( ) of photovoltaic devices containing the terpolymers were slightly lower (0.68-0.70 V) than the of the device containing the PDPP2DT-F2T2 polymer (0.79 V). The short-circuit current ( ) of the PDPPF2T2DPP-DTT device was significantly improved (14.14 mA cm) compared with that of the PDPP2DT-F2T2 device (8.29 mA cm). As a result, the power conversion efficiency (PCE) of the PDPPF2T2DPP-DTT device (6.35%) was increased by 33% compared with that of the simple D-A-type PDPP2DT-F2T2 device (4.78%). The highest and PCE values (the PDPPF2T2DPP-DTT device) were attributed to an optimal nanoscopically mixed morphology and strong interchain packing with a high face-on orientation in the blend film state. The study demonstrated that our strategy of using multiple donors in a regio-regular alternating fashion could fine-tune the optical, electronic, and morphological properties of D-A-type polymers, enhancing the performance of polymer solar cells.

摘要

我们设计并合成了基于区域规整交替二酮吡咯并吡咯（DPP）的D-A-D-A型三元共聚物（PDPPF2T2DPP-T2、PDPPF2T2DPP-TVT和PDPPF2T2DPP-DTT），使用了主给体（D）[3,3'-二氟-2,2'-联噻吩（F2T2）]和次给体（D）[2,2'-联噻吩（T2）、（）-1,2-二（噻吩-2-基）乙烯（TVT）或二噻吩并[3,2-:2',3'-]噻吩（DTT）]。还合成了一种PDPP2DT-F2T2 D-A聚合物，以比较其光学、电子和光伏性能。三元共聚物（PDPPF2T2DPP-T2、PDPPF2T2DPP-TVT和PDPPF2T2DPP-DTT）的吸收峰（λ = 801 - 810 nm）比PDPP2DT-F2T2聚合物的峰（λ = 799 nm）长，这与三元共聚物较高的最高占据分子轨道（HOMO）能级（-5.08至-5.13 eV）有关，相比之下，PDPP2DT-F2T2聚合物的能级为-5.38 eV。在模拟的AM 1.5G太阳光（100 mW/cm²）下，采用传统结构（ITO/PEDOT:PSS/聚合物:PCBM/Al）对这些基于DPP的聚合物的光伏性能进行了研究。含有三元共聚物的光伏器件的开路电压（Voc）略低于含有PDPP2DT-F2T2聚合物的器件的Voc（0.79 V），为0.68 - 0.70 V。与PDPP2DT-F2T2器件（8.29 mA/cm²）相比，PDPPF2T2DPP-DTT器件的短路电流（Jsc）显著提高（14.14 mA/cm²）。结果，PDPPF2T2DPP-DTT器件的功率转换效率（PCE）（6.35%）比简单的D-A型PDPP2DT-F2T2器件（4.78%）提高了33%。最高的Jsc和PCE值（PDPPF2T2DPP-DTT器件）归因于在共混膜状态下具有最佳的纳米级混合形态以及具有高面内取向的强链间堆积。该研究表明，我们以区域规整交替方式使用多个给体的策略可以微调D-A型聚合物的光学、电子和形态性能，提高聚合物太阳能电池的性能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/953f59d0fd52/c9ra08858j-f8.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/c5d3065cb37d/c9ra08858j-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/953f59d0fd52/c9ra08858j-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/5c856d7af9f1/c9ra08858j-s1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/74d264365865/c9ra08858j-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/1994f2abf20f/c9ra08858j-f2.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/57473ed6cc6a/c9ra08858j-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/89fbe2b8c67c/c9ra08858j-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/10464ead3a4b/c9ra08858j-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/c5d3065cb37d/c9ra08858j-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0687/9076513/953f59d0fd52/c9ra08858j-f8.jpg

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